/// <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:
try
{
CopyFiles(dir, (IndexCommit)dp.Snapshot());
}
finally
{
// Make sure to release the snapshot, otherwise these
// files will never be deleted during this IndexWriter
// session:
dp.Release();
}
}
public virtual void TestReuseAcrossWriters()
{
Directory dir = new MockRAMDirectory();
SnapshotDeletionPolicy dp = new SnapshotDeletionPolicy(new KeepOnlyLastCommitDeletionPolicy());
IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), dp, IndexWriter.MaxFieldLength.UNLIMITED, null);
// Force frequent flushes
writer.SetMaxBufferedDocs(2);
Document doc = new Document();
doc.Add(new Field("content", "aaa", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
for (int i = 0; i < 7; i++)
{
writer.AddDocument(doc, null);
if (i % 2 == 0)
{
writer.Commit(null);
}
}
IndexCommit cp = dp.Snapshot();
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
writer = new IndexWriter(dir, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), dp, IndexWriter.MaxFieldLength.UNLIMITED, null);
CopyFiles(dir, cp);
for (int i = 0; i < 7; i++)
{
writer.AddDocument(doc, null);
if (i % 2 == 0)
{
writer.Commit(null);
}
}
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
dp.Release();
writer = new IndexWriter(dir, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), dp, IndexWriter.MaxFieldLength.UNLIMITED, null);
writer.Close();
Assert.Throws <System.IO.FileNotFoundException>(() => CopyFiles(dir, cp), "did not hit expected IOException");
dir.Close();
}
public virtual void TestReuseAcrossWriters()
{
Directory dir = new MockRAMDirectory();
SnapshotDeletionPolicy dp = new SnapshotDeletionPolicy(new KeepOnlyLastCommitDeletionPolicy());
IndexWriter writer = new IndexWriter(dir, true, new StandardAnalyzer(), dp);
// Force frequent commits
writer.SetMaxBufferedDocs(2);
Document doc = new Document();
doc.Add(new Field("content", "aaa", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
for (int i = 0; i < 7; i++)
{
writer.AddDocument(doc);
}
IndexCommit cp = (IndexCommit)dp.Snapshot();
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
writer = new IndexWriter(dir, true, new StandardAnalyzer(), dp);
CopyFiles(dir, cp);
for (int i = 0; i < 7; i++)
{
writer.AddDocument(doc);
}
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
dp.Release();
writer = new IndexWriter(dir, true, new StandardAnalyzer(), dp);
writer.Close();
try
{
CopyFiles(dir, cp);
Assert.Fail("did not hit expected IOException");
}
catch (System.IO.IOException ioe)
{
// expected
}
dir.Close();
}
/// <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:
try
{
CopyFiles(dir, (IndexCommit) dp.Snapshot());
}
finally
{
// Make sure to release the snapshot, otherwise these
// files will never be deleted during this IndexWriter
// session:
dp.Release();
}
}
public virtual void TestReuseAcrossWriters()
{
Directory dir = new MockRAMDirectory();
SnapshotDeletionPolicy dp = new SnapshotDeletionPolicy(new KeepOnlyLastCommitDeletionPolicy());
IndexWriter writer = new IndexWriter(dir, true, new StandardAnalyzer(), dp);
// Force frequent commits
writer.SetMaxBufferedDocs(2);
Document doc = new Document();
doc.Add(new Field("content", "aaa", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
for (int i = 0; i < 7; i++)
writer.AddDocument(doc);
IndexCommit cp = (IndexCommit) dp.Snapshot();
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
writer = new IndexWriter(dir, true, new StandardAnalyzer(), dp);
CopyFiles(dir, cp);
for (int i = 0; i < 7; i++)
writer.AddDocument(doc);
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
dp.Release();
writer = new IndexWriter(dir, true, new StandardAnalyzer(), dp);
writer.Close();
try
{
CopyFiles(dir, cp);
Assert.Fail("did not hit expected IOException");
}
catch (System.IO.IOException ioe)
{
// expected
}
dir.Close();
}
public virtual void TestReuseAcrossWriters()
{
Directory dir = new MockRAMDirectory();
SnapshotDeletionPolicy dp = new SnapshotDeletionPolicy(new KeepOnlyLastCommitDeletionPolicy());
IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), dp, IndexWriter.MaxFieldLength.UNLIMITED);
// Force frequent flushes
writer.SetMaxBufferedDocs(2);
Document doc = new Document();
doc.Add(new Field("content", "aaa", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
for (int i = 0; i < 7; i++)
{
writer.AddDocument(doc);
if (i % 2 == 0)
{
writer.Commit();
}
}
IndexCommit cp = dp.Snapshot();
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
writer = new IndexWriter(dir, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), dp, IndexWriter.MaxFieldLength.UNLIMITED);
CopyFiles(dir, cp);
for (int i = 0; i < 7; i++)
{
writer.AddDocument(doc);
if (i % 2 == 0)
{
writer.Commit();
}
}
CopyFiles(dir, cp);
writer.Close();
CopyFiles(dir, cp);
dp.Release();
writer = new IndexWriter(dir, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), dp, IndexWriter.MaxFieldLength.UNLIMITED);
writer.Close();
Assert.Throws<System.IO.FileNotFoundException>(() => CopyFiles(dir, cp), "did not hit expected IOException");
dir.Close();
}
/// <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:
IndexCommitPoint cp = dp.Snapshot();
try
{
// While we hold the snapshot, and nomatter how long
// we take to do the backup, the IndexWriter will
// never delete the files in the snapshot:
System.Collections.ICollection files = cp.GetFileNames();
System.Collections.IEnumerator it = files.GetEnumerator();
while (it.MoveNext())
{
System.String fileName = (System.String) it.Current;
// NOTE: in a real backup you would not use
// readFile; you would need to use something else
// that copies the file to a backup location. This
// could even be a spawned shell process (eg "tar",
// "zip") that takes the list of files and builds a
// backup.
ReadFile(dir, fileName);
}
}
finally
{
// Make sure to release the snapshot, otherwise these
// files will never be deleted during this IndexWriter
// session:
dp.Release();
}
}