public virtual void TestReleaseSnapshot()
{
Directory dir = NewDirectory();
IndexWriter writer = new IndexWriter(dir, GetConfig(Random(), DeletionPolicy));
SnapshotDeletionPolicy sdp = (SnapshotDeletionPolicy)writer.Config.DelPolicy;
PrepareIndexAndSnapshots(sdp, writer, 1);
// Create another commit - we must do that, because otherwise the "snapshot"
// files will still remain in the index, since it's the last commit.
writer.AddDocument(new Document());
writer.Commit();
// Release
string segFileName = Snapshots[0].SegmentsFileName;
sdp.Release(Snapshots[0]);
writer.DeleteUnusedFiles();
writer.Dispose();
Assert.IsFalse(SlowFileExists(dir, segFileName), "segments file should not be found in dirctory: " + segFileName);
dir.Dispose();
}
public virtual void TestMultiThreadedSnapshotting()
{
Directory dir = NewDirectory();
IndexWriter writer = new IndexWriter(dir, GetConfig(Random(), DeletionPolicy));
SnapshotDeletionPolicy sdp = (SnapshotDeletionPolicy)writer.Config.DelPolicy;
ThreadClass[] threads = new ThreadClass[10];
IndexCommit[] snapshots = new IndexCommit[threads.Length];
for (int i = 0; i < threads.Length; i++)
{
int finalI = i;
threads[i] = new ThreadAnonymousInnerClassHelper2(this, writer, sdp, snapshots, finalI);
threads[i].Name = "t" + i;
}
foreach (ThreadClass t in threads)
{
t.Start();
}
foreach (ThreadClass t in threads)
{
t.Join();
}
// Do one last commit, so that after we release all snapshots, we stay w/ one commit
writer.AddDocument(new Document());
writer.Commit();
for (int i = 0; i < threads.Length; i++)
{
sdp.Release(snapshots[i]);
writer.DeleteUnusedFiles();
}
Assert.AreEqual(1, DirectoryReader.ListCommits(dir).Count);
writer.Dispose();
dir.Dispose();
}
/// <summary>
/// Example showing how to use the SnapshotDeletionPolicy to take a backup.
/// this method does not really do a backup; instead, it reads every byte of
/// every file just to test that the files indeed exist and are readable even
/// while the index is changing.
/// </summary>
public virtual void BackupIndex(Directory dir, SnapshotDeletionPolicy dp)
{
// To backup an index we first take a snapshot:
IndexCommit snapshot = dp.Snapshot();
try
{
CopyFiles(dir, snapshot);
}
finally
{
// Make sure to release the snapshot, otherwise these
// files will never be deleted during this IndexWriter
// session:
dp.Release(snapshot);
}
}
