public Editor(UnsafeEntry entry, DiskLruCache parent)
{
this.parent = parent;
Entry = entry;
written = entry.UnsafeReadable ? null : new bool[parent.ValueCount];
}
/// <summary>
/// Opens the cache in {@code directory}, creating a cache if none exists there.
/// </summary>
/// <param name="directory">a writable directory</param>
/// <param name="appVersion">???</param>
/// <param name="valueCount">the number of values per cache entry. Must be positive.</param>
/// <param name="maxSize">the maximum number of bytes this cache should use to store</param>
/// <param name="compactThreshold">Since how many operations cache will Collect</param>
/// <returns></returns>
public static DiskLruCache Open(DirectoryInfo directory, int appVersion, int valueCount, long maxSize, int compactThreshold = 2000)
{
if (maxSize <= 0)
{
throw new ArgumentException("maxSize <= 0");
}
if (valueCount <= 0)
{
throw new ArgumentException("valueCount <= 0");
}
var backupFile = new FileInfo(Path.Combine(directory.FullName, JournalFileBackup));
// If a bkp file exists, use it instead.
if (backupFile.Exists)
{
var journalFile = new FileInfo(Path.Combine(directory.FullName, JournalFile));
// If journal file also exists just delete backup file.
if (journalFile.Exists)
{
backupFile.Delete();
}
else
{
RenameTo(backupFile, journalFile, false);
}
}
var cache = new DiskLruCache(directory, appVersion, valueCount, maxSize, compactThreshold);
if (cache.journalFile.Exists)
{
try {
cache.ReadJournal();
cache.ProcessJournal();
return(cache);
} catch (IOException) {
// Journal is corrupt
cache.Delete();
}
}
// Create a new empty cache.
System.IO.Directory.CreateDirectory(directory.FullName);
cache = new DiskLruCache(directory, appVersion, valueCount, maxSize, compactThreshold);
cache.RebuildJournal();
return(cache);
}
public Snapshot(string key, long sequenceNumber, Stream[] readStreams, long[] lengths, DiskLruCache parent)
{
this.key = key;
this.sequenceNumber = sequenceNumber;
this.readStreams = readStreams;
this.lengths = lengths;
parentRef = new WeakReference <DiskLruCache>(parent);
}
