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+package cn.yyxx.support.cache.bitmap;
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+
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+import java.io.BufferedWriter;
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+import java.io.Closeable;
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+import java.io.EOFException;
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+import java.io.File;
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+import java.io.FileInputStream;
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+import java.io.FileNotFoundException;
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+import java.io.FileOutputStream;
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+import java.io.FilterOutputStream;
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+import java.io.IOException;
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+import java.io.InputStream;
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+import java.io.InputStreamReader;
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+import java.io.OutputStream;
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+import java.io.OutputStreamWriter;
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+import java.io.Writer;
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+import java.util.ArrayList;
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+import java.util.Iterator;
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+import java.util.LinkedHashMap;
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+import java.util.Map;
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+import java.util.concurrent.Callable;
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+import java.util.concurrent.LinkedBlockingQueue;
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+import java.util.concurrent.ThreadPoolExecutor;
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+import java.util.concurrent.TimeUnit;
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+import java.util.regex.Matcher;
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+import java.util.regex.Pattern;
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+
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+import cn.yyxx.support.hawkeye.LogUtils;
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+
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+/**
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+ * A cache that uses a bounded amount of space on a filesystem. Each cache
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+ * entry has a string key and a fixed number of values. Each key must match
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+ * the regex <strong>[a-z0-9_-]{1,120}</strong>. Values are byte sequences,
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+ * accessible as streams or files. Each value must be between {@code 0} and
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+ * {@code Integer.MAX_VALUE} bytes in length.
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+ *
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+ * <p>The cache stores its data in a directory on the filesystem. This
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+ * directory must be exclusive to the cache; the cache may delete or overwrite
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+ * files from its directory. It is an error for multiple processes to use the
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+ * same cache directory at the same time.
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+ *
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+ * <p>This cache limits the number of bytes that it will store on the
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+ * filesystem. When the number of stored bytes exceeds the limit, the cache will
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+ * remove entries in the background until the limit is satisfied. The limit is
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+ * not strict: the cache may temporarily exceed it while waiting for files to be
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+ * deleted. The limit does not include filesystem overhead or the cache
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+ * journal so space-sensitive applications should set a conservative limit.
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+ *
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+ * <p>Clients call {@link #edit} to create or update the values of an entry. An
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+ * entry may have only one editor at one time; if a value is not available to be
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+ * edited then {@link #edit} will return null.
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+ * <ul>
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+ * <li>When an entry is being <strong>created</strong> it is necessary to
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+ * supply a full set of values; the empty value should be used as a
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+ * placeholder if necessary.
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+ * <li>When an entry is being <strong>edited</strong>, it is not necessary
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+ * to supply data for every value; values default to their previous
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+ * value.
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+ * </ul>
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+ * Every {@link #edit} call must be matched by a call to {@link Editor#commit}
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+ * or {@link Editor#abort}. Committing is atomic: a read observes the full set
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+ * of values as they were before or after the commit, but never a mix of values.
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+ *
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+ * <p>Clients call {@link #get} to read a snapshot of an entry. The read will
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+ * observe the value at the time that {@link #get} was called. Updates and
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+ * removals after the call do not impact ongoing reads.
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+ *
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+ * <p>This class is tolerant of some I/O errors. If files are missing from the
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+ * filesystem, the corresponding entries will be dropped from the cache. If
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+ * an error occurs while writing a cache value, the edit will fail silently.
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+ * Callers should handle other problems by catching {@code IOException} and
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+ * responding appropriately.
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+ */
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+public final class DiskLruCache implements Closeable {
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+ static final String JOURNAL_FILE = "journal";
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+ static final String JOURNAL_FILE_TEMP = "journal.tmp";
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+ static final String JOURNAL_FILE_BACKUP = "journal.bkp";
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+ static final String MAGIC = "libcore.io.DiskLruCache";
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+ static final String VERSION_1 = "1";
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+ static final long ANY_SEQUENCE_NUMBER = -1;
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+ static final String STRING_KEY_PATTERN = "[a-z0-9_-]{1,120}";
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+ static final Pattern LEGAL_KEY_PATTERN = Pattern.compile(STRING_KEY_PATTERN);
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+ private static final String CLEAN = "CLEAN";
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+ private static final String DIRTY = "DIRTY";
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+ private static final String REMOVE = "REMOVE";
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+ private static final String READ = "READ";
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+
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+ /*
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+ * This cache uses a journal file named "journal". A typical journal file
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+ * looks like this:
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+ * libcore.io.DiskLruCache
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+ * 1
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+ * 100
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+ * 2
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+ *
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+ * CLEAN 3400330d1dfc7f3f7f4b8d4d803dfcf6 832 21054
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+ * DIRTY 335c4c6028171cfddfbaae1a9c313c52
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+ * CLEAN 335c4c6028171cfddfbaae1a9c313c52 3934 2342
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+ * REMOVE 335c4c6028171cfddfbaae1a9c313c52
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+ * DIRTY 1ab96a171faeeee38496d8b330771a7a
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+ * CLEAN 1ab96a171faeeee38496d8b330771a7a 1600 234
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+ * READ 335c4c6028171cfddfbaae1a9c313c52
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+ * READ 3400330d1dfc7f3f7f4b8d4d803dfcf6
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+ *
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+ * The first five lines of the journal form its header. They are the
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+ * constant string "libcore.io.DiskLruCache", the disk cache's version,
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+ * the application's version, the value count, and a blank line.
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+ *
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+ * Each of the subsequent lines in the file is a record of the state of a
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+ * cache entry. Each line contains space-separated values: a state, a key,
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+ * and optional state-specific values.
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+ * o DIRTY lines track that an entry is actively being created or updated.
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+ * Every successful DIRTY action should be followed by a CLEAN or REMOVE
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+ * action. DIRTY lines without a matching CLEAN or REMOVE indicate that
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+ * temporary files may need to be deleted.
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+ * o CLEAN lines track a cache entry that has been successfully published
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+ * and may be read. A publish line is followed by the lengths of each of
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+ * its values.
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+ * o READ lines track accesses for LRU.
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+ * o REMOVE lines track entries that have been deleted.
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+ *
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+ * The journal file is appended to as cache operations occur. The journal may
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+ * occasionally be compacted by dropping redundant lines. A temporary file named
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+ * "journal.tmp" will be used during compaction; that file should be deleted if
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+ * it exists when the cache is opened.
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+ */
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+
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+ private final File directory;
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+ private final File journalFile;
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+ private final File journalFileTmp;
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+ private final File journalFileBackup;
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+ private final int appVersion;
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+ private long maxSize;
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+ private final int valueCount;
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+ private long size = 0;
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+ private Writer journalWriter;
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+ private final LinkedHashMap<String, Entry> lruEntries = new LinkedHashMap<String, Entry>(0, 0.75f, true);
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+ private int redundantOpCount;
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+
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+ /**
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+ * To differentiate between old and current snapshots, each entry is given
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+ * a sequence number each time an edit is committed. A snapshot is stale if
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+ * its sequence number is not equal to its entry's sequence number.
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+ */
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+ private long nextSequenceNumber = 0;
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+
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+ /**
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+ * This cache uses a single background thread to evict entries.
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+ */
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+ final ThreadPoolExecutor executorService =
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+ new ThreadPoolExecutor(0, 1, 60L, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
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+ private final Callable<Void> cleanupCallable = new Callable<Void>() {
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+ public Void call() throws Exception {
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+ synchronized (DiskLruCache.this) {
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+ if (journalWriter == null) {
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+ return null; // Closed.
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+ }
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+ trimToSize();
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+ if (journalRebuildRequired()) {
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+ rebuildJournal();
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+ redundantOpCount = 0;
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+ }
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+ }
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+ return null;
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+ }
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+ };
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+
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+ private DiskLruCache(File directory, int appVersion, int valueCount, long maxSize) {
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+ this.directory = directory;
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+ this.appVersion = appVersion;
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+ this.journalFile = new File(directory, JOURNAL_FILE);
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+ this.journalFileTmp = new File(directory, JOURNAL_FILE_TEMP);
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+ this.journalFileBackup = new File(directory, JOURNAL_FILE_BACKUP);
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+ this.valueCount = valueCount;
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+ this.maxSize = maxSize;
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+ }
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+
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+ /**
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+ * Opens the cache in {@code directory}, creating a cache if none exists
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+ * there.
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+ *
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+ * @param directory a writable directory
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+ * @param valueCount the number of values per cache entry. Must be positive.
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+ * @param maxSize the maximum number of bytes this cache should use to store
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+ * @throws IOException if reading or writing the cache directory fails
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+ */
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+ public static DiskLruCache open(File directory, int appVersion, int valueCount, long maxSize)
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+ throws IOException {
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+ if (maxSize <= 0) {
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+ throw new IllegalArgumentException("maxSize <= 0");
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+ }
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+ if (valueCount <= 0) {
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+ throw new IllegalArgumentException("valueCount <= 0");
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+ }
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+
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+ // If a bkp file exists, use it instead.
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+ File backupFile = new File(directory, JOURNAL_FILE_BACKUP);
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+ if (backupFile.exists()) {
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+ File journalFile = new File(directory, JOURNAL_FILE);
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+ // If journal file also exists just delete backup file.
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+ if (journalFile.exists()) {
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+ backupFile.delete();
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+ } else {
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+ renameTo(backupFile, journalFile, false);
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+ }
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+ }
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+
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+ // Prefer to pick up where we left off.
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+ DiskLruCache cache = new DiskLruCache(directory, appVersion, valueCount, maxSize);
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+ if (cache.journalFile.exists()) {
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+ try {
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+ cache.readJournal();
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+ cache.processJournal();
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+ return cache;
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+ } catch (IOException e) {
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+ e.printStackTrace();
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+ LogUtils.e("DiskLruCache " + directory + " is corrupt: " + e.getMessage() + ", removing");
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+ cache.delete();
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+ }
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+ }
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+
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+ // Create a new empty cache.
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+ directory.mkdirs();
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+ cache = new DiskLruCache(directory, appVersion, valueCount, maxSize);
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+ cache.rebuildJournal();
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+ return cache;
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+ }
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+
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+ private void readJournal() throws IOException {
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+ StrictLineReader reader = new StrictLineReader(new FileInputStream(journalFile), Util.US_ASCII);
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+ try {
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+ String magic = reader.readLine();
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+ String version = reader.readLine();
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+ String appVersionString = reader.readLine();
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+ String valueCountString = reader.readLine();
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+ String blank = reader.readLine();
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+ if (!MAGIC.equals(magic) || !VERSION_1.equals(version) || !Integer.toString(appVersion).equals(appVersionString)
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+ || !Integer.toString(valueCount).equals(valueCountString) || !"".equals(blank)) {
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+ throw new IOException("unexpected journal header: [" + magic + ", " + version + ", " + valueCountString + ", " + blank + "]");
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+ }
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+
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+ int lineCount = 0;
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+ while (true) {
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+ try {
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+ readJournalLine(reader.readLine());
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+ lineCount++;
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+ } catch (EOFException endOfJournal) {
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+ break;
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+ }
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+ }
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+ redundantOpCount = lineCount - lruEntries.size();
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+
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+ // If we ended on a truncated line, rebuild the journal before appending to it.
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+ if (reader.hasUnterminatedLine()) {
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+ rebuildJournal();
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+ } else {
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+ journalWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(journalFile, true), Util.US_ASCII));
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+ }
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+ } finally {
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+ Util.closeQuietly(reader);
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+ }
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+ }
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+
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+ private void readJournalLine(String line) throws IOException {
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+ int firstSpace = line.indexOf(' ');
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+ if (firstSpace == -1) {
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+ throw new IOException("unexpected journal line: " + line);
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+ }
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+
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+ int keyBegin = firstSpace + 1;
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+ int secondSpace = line.indexOf(' ', keyBegin);
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+ final String key;
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+ if (secondSpace == -1) {
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+ key = line.substring(keyBegin);
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+ if (firstSpace == REMOVE.length() && line.startsWith(REMOVE)) {
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+ lruEntries.remove(key);
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+ return;
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+ }
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+ } else {
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+ key = line.substring(keyBegin, secondSpace);
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+ }
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+
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+ Entry entry = lruEntries.get(key);
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+ if (entry == null) {
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+ entry = new Entry(key);
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+ lruEntries.put(key, entry);
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+ }
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+
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+ if (secondSpace != -1 && firstSpace == CLEAN.length() && line.startsWith(CLEAN)) {
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+ String[] parts = line.substring(secondSpace + 1).split(" ");
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+ entry.readable = true;
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+ entry.currentEditor = null;
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+ entry.setLengths(parts);
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+ } else if (secondSpace == -1 && firstSpace == DIRTY.length() && line.startsWith(DIRTY)) {
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+ entry.currentEditor = new Editor(entry);
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+ } else if (secondSpace == -1 && firstSpace == READ.length() && line.startsWith(READ)) {
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+ // This work was already done by calling lruEntries.get().
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+ } else {
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+ throw new IOException("unexpected journal line: " + line);
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+ }
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+ }
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+
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+ /**
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+ * Computes the initial size and collects garbage as a part of opening the
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+ * cache. Dirty entries are assumed to be inconsistent and will be deleted.
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+ */
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+ private void processJournal() throws IOException {
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+ deleteIfExists(journalFileTmp);
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+ for (Iterator<Entry> i = lruEntries.values().iterator(); i.hasNext(); ) {
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+ Entry entry = i.next();
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+ if (entry.currentEditor == null) {
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+ for (int t = 0; t < valueCount; t++) {
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+ size += entry.lengths[t];
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+ }
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+ } else {
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+ entry.currentEditor = null;
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+ for (int t = 0; t < valueCount; t++) {
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+ deleteIfExists(entry.getCleanFile(t));
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+ deleteIfExists(entry.getDirtyFile(t));
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+ }
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+ i.remove();
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+ }
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+ }
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+ }
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+
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+ /**
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+ * Creates a new journal that omits redundant information. This replaces the
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+ * current journal if it exists.
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+ */
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+ private synchronized void rebuildJournal() throws IOException {
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+ if (journalWriter != null) {
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+ journalWriter.close();
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+ }
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+
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+ Writer writer = new BufferedWriter(
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|
|
+ new OutputStreamWriter(new FileOutputStream(journalFileTmp), Util.US_ASCII));
|
|
|
|
+ try {
|
|
|
|
+ writer.write(MAGIC);
|
|
|
|
+ writer.write("\n");
|
|
|
|
+ writer.write(VERSION_1);
|
|
|
|
+ writer.write("\n");
|
|
|
|
+ writer.write(Integer.toString(appVersion));
|
|
|
|
+ writer.write("\n");
|
|
|
|
+ writer.write(Integer.toString(valueCount));
|
|
|
|
+ writer.write("\n");
|
|
|
|
+ writer.write("\n");
|
|
|
|
+
|
|
|
|
+ for (Entry entry : lruEntries.values()) {
|
|
|
|
+ if (entry.currentEditor != null) {
|
|
|
|
+ writer.write(DIRTY + ' ' + entry.key + '\n');
|
|
|
|
+ } else {
|
|
|
|
+ writer.write(CLEAN + ' ' + entry.key + entry.getLengths() + '\n');
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ } catch (Exception e) {
|
|
|
|
+ e.printStackTrace();
|
|
|
|
+ } finally {
|
|
|
|
+ writer.close();
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ if (journalFile.exists()) {
|
|
|
|
+ renameTo(journalFile, journalFileBackup, true);
|
|
|
|
+ }
|
|
|
|
+ renameTo(journalFileTmp, journalFile, false);
|
|
|
|
+ journalFileBackup.delete();
|
|
|
|
+
|
|
|
|
+ journalWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(journalFile, true), Util.US_ASCII));
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private static void deleteIfExists(File file) throws IOException {
|
|
|
|
+ if (file.exists() && !file.delete()) {
|
|
|
|
+ throw new IOException();
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private static void renameTo(File from, File to, boolean deleteDestination) throws IOException {
|
|
|
|
+ if (deleteDestination) {
|
|
|
|
+ deleteIfExists(to);
|
|
|
|
+ }
|
|
|
|
+ if (!from.renameTo(to)) {
|
|
|
|
+ throw new IOException();
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns a snapshot of the entry named {@code key}, or null if it doesn't
|
|
|
|
+ * exist is not currently readable. If a value is returned, it is moved to
|
|
|
|
+ * the head of the LRU queue.
|
|
|
|
+ */
|
|
|
|
+ public synchronized Snapshot get(String key) throws IOException {
|
|
|
|
+ checkNotClosed();
|
|
|
|
+ validateKey(key);
|
|
|
|
+ Entry entry = lruEntries.get(key);
|
|
|
|
+ if (entry == null) {
|
|
|
|
+ return null;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ if (!entry.readable) {
|
|
|
|
+ return null;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ // Open all streams eagerly to guarantee that we see a single published
|
|
|
|
+ // snapshot. If we opened streams lazily then the streams could come
|
|
|
|
+ // from different edits.
|
|
|
|
+ InputStream[] ins = new InputStream[valueCount];
|
|
|
|
+ try {
|
|
|
|
+ for (int i = 0; i < valueCount; i++) {
|
|
|
|
+ ins[i] = new FileInputStream(entry.getCleanFile(i));
|
|
|
|
+ }
|
|
|
|
+ } catch (FileNotFoundException e) {
|
|
|
|
+ // A file must have been deleted manually!
|
|
|
|
+ for (int i = 0; i < valueCount; i++) {
|
|
|
|
+ if (ins[i] != null) {
|
|
|
|
+ Util.closeQuietly(ins[i]);
|
|
|
|
+ } else {
|
|
|
|
+ break;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ return null;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ redundantOpCount++;
|
|
|
|
+ journalWriter.append(READ + ' ' + key + '\n');
|
|
|
|
+ if (journalRebuildRequired()) {
|
|
|
|
+ executorService.submit(cleanupCallable);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ return new Snapshot(key, entry.sequenceNumber, ins, entry.lengths);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns an editor for the entry named {@code key}, or null if another
|
|
|
|
+ * edit is in progress.
|
|
|
|
+ */
|
|
|
|
+ public Editor edit(String key) throws IOException {
|
|
|
|
+ return edit(key, ANY_SEQUENCE_NUMBER);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private synchronized Editor edit(String key, long expectedSequenceNumber) throws IOException {
|
|
|
|
+ checkNotClosed();
|
|
|
|
+ validateKey(key);
|
|
|
|
+ Entry entry = lruEntries.get(key);
|
|
|
|
+ if (expectedSequenceNumber != ANY_SEQUENCE_NUMBER && (entry == null
|
|
|
|
+ || entry.sequenceNumber != expectedSequenceNumber)) {
|
|
|
|
+ return null; // Snapshot is stale.
|
|
|
|
+ }
|
|
|
|
+ if (entry == null) {
|
|
|
|
+ entry = new Entry(key);
|
|
|
|
+ lruEntries.put(key, entry);
|
|
|
|
+ } else if (entry.currentEditor != null) {
|
|
|
|
+ return null; // Another edit is in progress.
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ Editor editor = new Editor(entry);
|
|
|
|
+ entry.currentEditor = editor;
|
|
|
|
+
|
|
|
|
+ // Flush the journal before creating files to prevent file leaks.
|
|
|
|
+ journalWriter.write(DIRTY + ' ' + key + '\n');
|
|
|
|
+ journalWriter.flush();
|
|
|
|
+ return editor;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns the directory where this cache stores its data.
|
|
|
|
+ */
|
|
|
|
+ public File getDirectory() {
|
|
|
|
+ return directory;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns the maximum number of bytes that this cache should use to store
|
|
|
|
+ * its data.
|
|
|
|
+ */
|
|
|
|
+ public synchronized long getMaxSize() {
|
|
|
|
+ return maxSize;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Changes the maximum number of bytes the cache can store and queues a job
|
|
|
|
+ * to trim the existing store, if necessary.
|
|
|
|
+ */
|
|
|
|
+ public synchronized void setMaxSize(long maxSize) {
|
|
|
|
+ this.maxSize = maxSize;
|
|
|
|
+ executorService.submit(cleanupCallable);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns the number of bytes currently being used to store the values in
|
|
|
|
+ * this cache. This may be greater than the max size if a background
|
|
|
|
+ * deletion is pending.
|
|
|
|
+ */
|
|
|
|
+ public synchronized long size() {
|
|
|
|
+ return size;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private synchronized void completeEdit(Editor editor, boolean success) throws IOException {
|
|
|
|
+ Entry entry = editor.entry;
|
|
|
|
+ if (entry.currentEditor != editor) {
|
|
|
|
+ throw new IllegalStateException();
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ // If this edit is creating the entry for the first time, every index must have a value.
|
|
|
|
+ if (success && !entry.readable) {
|
|
|
|
+ for (int i = 0; i < valueCount; i++) {
|
|
|
|
+ if (!editor.written[i]) {
|
|
|
|
+ editor.abort();
|
|
|
|
+ throw new IllegalStateException("Newly created entry didn't create value for index " + i);
|
|
|
|
+ }
|
|
|
|
+ if (!entry.getDirtyFile(i).exists()) {
|
|
|
|
+ editor.abort();
|
|
|
|
+ return;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ for (int i = 0; i < valueCount; i++) {
|
|
|
|
+ File dirty = entry.getDirtyFile(i);
|
|
|
|
+ if (success) {
|
|
|
|
+ if (dirty.exists()) {
|
|
|
|
+ File clean = entry.getCleanFile(i);
|
|
|
|
+ dirty.renameTo(clean);
|
|
|
|
+ long oldLength = entry.lengths[i];
|
|
|
|
+ long newLength = clean.length();
|
|
|
|
+ entry.lengths[i] = newLength;
|
|
|
|
+ size = size - oldLength + newLength;
|
|
|
|
+ }
|
|
|
|
+ } else {
|
|
|
|
+ deleteIfExists(dirty);
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ redundantOpCount++;
|
|
|
|
+ entry.currentEditor = null;
|
|
|
|
+ if (entry.readable | success) {
|
|
|
|
+ entry.readable = true;
|
|
|
|
+ journalWriter.write(CLEAN + ' ' + entry.key + entry.getLengths() + '\n');
|
|
|
|
+ if (success) {
|
|
|
|
+ entry.sequenceNumber = nextSequenceNumber++;
|
|
|
|
+ }
|
|
|
|
+ } else {
|
|
|
|
+ lruEntries.remove(entry.key);
|
|
|
|
+ journalWriter.write(REMOVE + ' ' + entry.key + '\n');
|
|
|
|
+ }
|
|
|
|
+ journalWriter.flush();
|
|
|
|
+
|
|
|
|
+ if (size > maxSize || journalRebuildRequired()) {
|
|
|
|
+ executorService.submit(cleanupCallable);
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * We only rebuild the journal when it will halve the size of the journal
|
|
|
|
+ * and eliminate at least 2000 ops.
|
|
|
|
+ */
|
|
|
|
+ private boolean journalRebuildRequired() {
|
|
|
|
+ final int redundantOpCompactThreshold = 2000;
|
|
|
|
+ return redundantOpCount >= redundantOpCompactThreshold //
|
|
|
|
+ && redundantOpCount >= lruEntries.size();
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Drops the entry for {@code key} if it exists and can be removed. Entries
|
|
|
|
+ * actively being edited cannot be removed.
|
|
|
|
+ *
|
|
|
|
+ * @return true if an entry was removed.
|
|
|
|
+ */
|
|
|
|
+ public synchronized boolean remove(String key) throws IOException {
|
|
|
|
+ checkNotClosed();
|
|
|
|
+ validateKey(key);
|
|
|
|
+ Entry entry = lruEntries.get(key);
|
|
|
|
+ if (entry == null || entry.currentEditor != null) {
|
|
|
|
+ return false;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ for (int i = 0; i < valueCount; i++) {
|
|
|
|
+ File file = entry.getCleanFile(i);
|
|
|
|
+ if (file.exists() && !file.delete()) {
|
|
|
|
+ throw new IOException("failed to delete " + file);
|
|
|
|
+ }
|
|
|
|
+ size -= entry.lengths[i];
|
|
|
|
+ entry.lengths[i] = 0;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ redundantOpCount++;
|
|
|
|
+ journalWriter.append(REMOVE + ' ' + key + '\n');
|
|
|
|
+ lruEntries.remove(key);
|
|
|
|
+
|
|
|
|
+ if (journalRebuildRequired()) {
|
|
|
|
+ executorService.submit(cleanupCallable);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ return true;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns true if this cache has been closed.
|
|
|
|
+ */
|
|
|
|
+ public synchronized boolean isClosed() {
|
|
|
|
+ return journalWriter == null;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private void checkNotClosed() {
|
|
|
|
+ if (journalWriter == null) {
|
|
|
|
+ throw new IllegalStateException("cache is closed");
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Force buffered operations to the filesystem.
|
|
|
|
+ */
|
|
|
|
+ public synchronized void flush() throws IOException {
|
|
|
|
+ checkNotClosed();
|
|
|
|
+ trimToSize();
|
|
|
|
+ journalWriter.flush();
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Closes this cache. Stored values will remain on the filesystem.
|
|
|
|
+ */
|
|
|
|
+ public synchronized void close() throws IOException {
|
|
|
|
+ if (journalWriter == null) {
|
|
|
|
+ return; // Already closed.
|
|
|
|
+ }
|
|
|
|
+ for (Entry entry : new ArrayList<Entry>(lruEntries.values())) {
|
|
|
|
+ if (entry.currentEditor != null) {
|
|
|
|
+ entry.currentEditor.abort();
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ trimToSize();
|
|
|
|
+ journalWriter.close();
|
|
|
|
+ journalWriter = null;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private void trimToSize() throws IOException {
|
|
|
|
+ while (size > maxSize) {
|
|
|
|
+ Map.Entry<String, Entry> toEvict = lruEntries.entrySet().iterator().next();
|
|
|
|
+ remove(toEvict.getKey());
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Closes the cache and deletes all of its stored values. This will delete
|
|
|
|
+ * all files in the cache directory including files that weren't created by
|
|
|
|
+ * the cache.
|
|
|
|
+ */
|
|
|
|
+ public void delete() throws IOException {
|
|
|
|
+ close();
|
|
|
|
+ Util.deleteContents(directory);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private void validateKey(String key) {
|
|
|
|
+ Matcher matcher = LEGAL_KEY_PATTERN.matcher(key);
|
|
|
|
+ if (!matcher.matches()) {
|
|
|
|
+ throw new IllegalArgumentException("keys must match regex "
|
|
|
|
+ + STRING_KEY_PATTERN + ": \"" + key + "\"");
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private static String inputStreamToString(InputStream in) throws IOException {
|
|
|
|
+ return Util.readFully(new InputStreamReader(in, Util.UTF_8));
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * A snapshot of the values for an entry.
|
|
|
|
+ */
|
|
|
|
+ public final class Snapshot implements Closeable {
|
|
|
|
+ private final String key;
|
|
|
|
+ private final long sequenceNumber;
|
|
|
|
+ private final InputStream[] ins;
|
|
|
|
+ private final long[] lengths;
|
|
|
|
+
|
|
|
|
+ private Snapshot(String key, long sequenceNumber, InputStream[] ins, long[] lengths) {
|
|
|
|
+ this.key = key;
|
|
|
|
+ this.sequenceNumber = sequenceNumber;
|
|
|
|
+ this.ins = ins;
|
|
|
|
+ this.lengths = lengths;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns an editor for this snapshot's entry, or null if either the
|
|
|
|
+ * entry has changed since this snapshot was created or if another edit
|
|
|
|
+ * is in progress.
|
|
|
|
+ */
|
|
|
|
+ public Editor edit() throws IOException {
|
|
|
|
+ return DiskLruCache.this.edit(key, sequenceNumber);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns the unbuffered stream with the value for {@code index}.
|
|
|
|
+ */
|
|
|
|
+ public InputStream getInputStream(int index) {
|
|
|
|
+ return ins[index];
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns the string value for {@code index}.
|
|
|
|
+ */
|
|
|
|
+ public String getString(int index) throws IOException {
|
|
|
|
+ return inputStreamToString(getInputStream(index));
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns the byte length of the value for {@code index}.
|
|
|
|
+ */
|
|
|
|
+ public long getLength(int index) {
|
|
|
|
+ return lengths[index];
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ public void close() {
|
|
|
|
+ for (InputStream in : ins) {
|
|
|
|
+ Util.closeQuietly(in);
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private static final OutputStream NULL_OUTPUT_STREAM = new OutputStream() {
|
|
|
|
+ @Override
|
|
|
|
+ public void write(int b) throws IOException {
|
|
|
|
+ // Eat all writes silently. Nom nom.
|
|
|
|
+ }
|
|
|
|
+ };
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Edits the values for an entry.
|
|
|
|
+ */
|
|
|
|
+ public final class Editor {
|
|
|
|
+ private final Entry entry;
|
|
|
|
+ private final boolean[] written;
|
|
|
|
+ private boolean hasErrors;
|
|
|
|
+ private boolean committed;
|
|
|
|
+
|
|
|
|
+ private Editor(Entry entry) {
|
|
|
|
+ this.entry = entry;
|
|
|
|
+ this.written = (entry.readable) ? null : new boolean[valueCount];
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns an unbuffered input stream to read the last committed value,
|
|
|
|
+ * or null if no value has been committed.
|
|
|
|
+ */
|
|
|
|
+ public InputStream newInputStream(int index) throws IOException {
|
|
|
|
+ synchronized (DiskLruCache.this) {
|
|
|
|
+ if (entry.currentEditor != this) {
|
|
|
|
+ throw new IllegalStateException();
|
|
|
|
+ }
|
|
|
|
+ if (!entry.readable) {
|
|
|
|
+ return null;
|
|
|
|
+ }
|
|
|
|
+ try {
|
|
|
|
+ return new FileInputStream(entry.getCleanFile(index));
|
|
|
|
+ } catch (FileNotFoundException e) {
|
|
|
|
+ return null;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns the last committed value as a string, or null if no value
|
|
|
|
+ * has been committed.
|
|
|
|
+ */
|
|
|
|
+ public String getString(int index) throws IOException {
|
|
|
|
+ InputStream in = newInputStream(index);
|
|
|
|
+ return in != null ? inputStreamToString(in) : null;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Returns a new unbuffered output stream to write the value at
|
|
|
|
+ * {@code index}. If the underlying output stream encounters errors
|
|
|
|
+ * when writing to the filesystem, this edit will be aborted when
|
|
|
|
+ * {@link #commit} is called. The returned output stream does not throw
|
|
|
|
+ * IOExceptions.
|
|
|
|
+ */
|
|
|
|
+ public OutputStream newOutputStream(int index) throws IOException {
|
|
|
|
+ if (index < 0 || index >= valueCount) {
|
|
|
|
+ throw new IllegalArgumentException("Expected index " + index + " to "
|
|
|
|
+ + "be greater than 0 and less than the maximum value count "
|
|
|
|
+ + "of " + valueCount);
|
|
|
|
+ }
|
|
|
|
+ synchronized (DiskLruCache.this) {
|
|
|
|
+ if (entry.currentEditor != this) {
|
|
|
|
+ throw new IllegalStateException();
|
|
|
|
+ }
|
|
|
|
+ if (!entry.readable) {
|
|
|
|
+ written[index] = true;
|
|
|
|
+ }
|
|
|
|
+ File dirtyFile = entry.getDirtyFile(index);
|
|
|
|
+ FileOutputStream outputStream;
|
|
|
|
+ try {
|
|
|
|
+ outputStream = new FileOutputStream(dirtyFile);
|
|
|
|
+ } catch (FileNotFoundException e) {
|
|
|
|
+ // Attempt to recreate the cache directory.
|
|
|
|
+ directory.mkdirs();
|
|
|
|
+ try {
|
|
|
|
+ outputStream = new FileOutputStream(dirtyFile);
|
|
|
|
+ } catch (FileNotFoundException e2) {
|
|
|
|
+ // We are unable to recover. Silently eat the writes.
|
|
|
|
+ return NULL_OUTPUT_STREAM;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ return new FaultHidingOutputStream(outputStream);
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Sets the value at {@code index} to {@code value}.
|
|
|
|
+ */
|
|
|
|
+ public void set(int index, String value) throws IOException {
|
|
|
|
+ Writer writer = null;
|
|
|
|
+ try {
|
|
|
|
+ writer = new OutputStreamWriter(newOutputStream(index), Util.UTF_8);
|
|
|
|
+ writer.write(value);
|
|
|
|
+ } finally {
|
|
|
|
+ Util.closeQuietly(writer);
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Commits this edit so it is visible to readers. This releases the
|
|
|
|
+ * edit lock so another edit may be started on the same key.
|
|
|
|
+ */
|
|
|
|
+ public void commit() throws IOException {
|
|
|
|
+ if (hasErrors) {
|
|
|
|
+ completeEdit(this, false);
|
|
|
|
+ remove(entry.key); // The previous entry is stale.
|
|
|
|
+ } else {
|
|
|
|
+ completeEdit(this, true);
|
|
|
|
+ }
|
|
|
|
+ committed = true;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Aborts this edit. This releases the edit lock so another edit may be
|
|
|
|
+ * started on the same key.
|
|
|
|
+ */
|
|
|
|
+ public void abort() throws IOException {
|
|
|
|
+ completeEdit(this, false);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ public void abortUnlessCommitted() {
|
|
|
|
+ if (!committed) {
|
|
|
|
+ try {
|
|
|
|
+ abort();
|
|
|
|
+ } catch (IOException ignored) {
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private class FaultHidingOutputStream extends FilterOutputStream {
|
|
|
|
+ private FaultHidingOutputStream(OutputStream out) {
|
|
|
|
+ super(out);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ @Override
|
|
|
|
+ public void write(int oneByte) {
|
|
|
|
+ try {
|
|
|
|
+ out.write(oneByte);
|
|
|
|
+ } catch (IOException e) {
|
|
|
|
+ hasErrors = true;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ @Override
|
|
|
|
+ public void write(byte[] buffer, int offset, int length) {
|
|
|
|
+ try {
|
|
|
|
+ out.write(buffer, offset, length);
|
|
|
|
+ } catch (IOException e) {
|
|
|
|
+ hasErrors = true;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ @Override
|
|
|
|
+ public void close() {
|
|
|
|
+ try {
|
|
|
|
+ out.close();
|
|
|
|
+ } catch (IOException e) {
|
|
|
|
+ hasErrors = true;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ @Override
|
|
|
|
+ public void flush() {
|
|
|
|
+ try {
|
|
|
|
+ out.flush();
|
|
|
|
+ } catch (IOException e) {
|
|
|
|
+ hasErrors = true;
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private final class Entry {
|
|
|
|
+ private final String key;
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Lengths of this entry's files.
|
|
|
|
+ */
|
|
|
|
+ private final long[] lengths;
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * True if this entry has ever been published.
|
|
|
|
+ */
|
|
|
|
+ private boolean readable;
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * The ongoing edit or null if this entry is not being edited.
|
|
|
|
+ */
|
|
|
|
+ private Editor currentEditor;
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * The sequence number of the most recently committed edit to this entry.
|
|
|
|
+ */
|
|
|
|
+ private long sequenceNumber;
|
|
|
|
+
|
|
|
|
+ private Entry(String key) {
|
|
|
|
+ this.key = key;
|
|
|
|
+ this.lengths = new long[valueCount];
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ public String getLengths() throws IOException {
|
|
|
|
+ StringBuilder result = new StringBuilder();
|
|
|
|
+ for (long size : lengths) {
|
|
|
|
+ result.append(' ').append(size);
|
|
|
|
+ }
|
|
|
|
+ return result.toString();
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ /**
|
|
|
|
+ * Set lengths using decimal numbers like "10123".
|
|
|
|
+ */
|
|
|
|
+ private void setLengths(String[] strings) throws IOException {
|
|
|
|
+ if (strings.length != valueCount) {
|
|
|
|
+ throw invalidLengths(strings);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ try {
|
|
|
|
+ for (int i = 0; i < strings.length; i++) {
|
|
|
|
+ lengths[i] = Long.parseLong(strings[i]);
|
|
|
|
+ }
|
|
|
|
+ } catch (NumberFormatException e) {
|
|
|
|
+ throw invalidLengths(strings);
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ private IOException invalidLengths(String[] strings) throws IOException {
|
|
|
|
+ throw new IOException("unexpected journal line: " + java.util.Arrays.toString(strings));
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ public File getCleanFile(int i) {
|
|
|
|
+ return new File(directory, key + "." + i);
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ public File getDirtyFile(int i) {
|
|
|
|
+ return new File(directory, key + "." + i + ".tmp");
|
|
|
|
+ }
|
|
|
|
+ }
|
|
|
|
+}
|