package org.infinispan.lucene.impl;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.store.IndexOutput;
import org.infinispan.AdvancedCache;
import org.infinispan.Cache;
import org.infinispan.context.Flag;
import org.infinispan.lucene.ChunkCacheKey;
import org.infinispan.lucene.FileCacheKey;
import org.infinispan.lucene.FileMetadata;
import org.infinispan.lucene.readlocks.SegmentReadLocker;
import org.infinispan.persistence.spi.PersistenceException;
import org.infinispan.remoting.transport.Address;
import org.infinispan.remoting.transport.LocalModeAddress;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* Common code for different Directory implementations.
*
* @author Sanne Grinovero
* @since 5.2
*/
class DirectoryImplementor {
private static final Log log = LogFactory.getLog(DirectoryImplementor.class);
private static final boolean trace = log.isTraceEnabled();
protected final AdvancedCache<FileCacheKey, FileMetadata> metadataCache;
protected final AdvancedCache<ChunkCacheKey, Object> chunksCache;
protected final AdvancedCache<Object, Integer> distLocksCache;
// indexName is used to be able to store multiple named indexes in the same caches
protected final String indexName;
// chunk size used for this Directory
protected final int chunkSize;
protected final FileListOperations fileOps;
private final SegmentReadLocker readLocks;
private final FileCacheKey segmentsGenFileKey;
private final int affinitySegmentId;
public DirectoryImplementor(Cache<?, ?> metadataCache, Cache<?, ?> chunksCache, Cache<?, ?> distLocksCache, String indexName, int chunkSize, SegmentReadLocker readLocker, boolean fileListUpdatedAsync, int affinitySegmentId) {
this.affinitySegmentId = affinitySegmentId;
if (chunkSize <= 0)
throw new IllegalArgumentException("chunkSize must be a positive integer");
this.metadataCache = (AdvancedCache<FileCacheKey, FileMetadata>) metadataCache.getAdvancedCache().withFlags(Flag.SKIP_INDEXING);
this.chunksCache = (AdvancedCache<ChunkCacheKey, Object>) chunksCache.getAdvancedCache().withFlags(Flag.SKIP_INDEXING);
this.distLocksCache = (AdvancedCache<Object, Integer>) distLocksCache.getAdvancedCache().withFlags(Flag.SKIP_INDEXING);
this.indexName = indexName;
this.chunkSize = chunkSize;
this.fileOps = new FileListOperations(this.metadataCache, indexName, fileListUpdatedAsync, this.affinitySegmentId);
this.segmentsGenFileKey = new FileCacheKey(indexName, IndexFileNames.SEGMENTS, this.affinitySegmentId);
this.readLocks = readLocker;
}
String[] list() {
return fileOps.listFilenames();
}
boolean fileExists(final String name) {
return fileOps.fileExists(name);
}
void deleteFile(final String name) {
fileOps.deleteFileName(name);
readLocks.deleteOrReleaseReadLock(name);
if (log.isDebugEnabled()) {
log.debugf("Removed file: %s from index: %s from %s", name, indexName, getAddress(chunksCache));
}
}
void renameFile(final String from, final String to) {
final FileCacheKey fromKey = new FileCacheKey(indexName, from, affinitySegmentId);
final FileMetadata metadata = metadataCache.get(fromKey);
final int bufferSize = metadata.getBufferSize();
// preparation: copy all chunks to new keys
int i = -1;
Object ob;
do {
final ChunkCacheKey fromChunkKey = new ChunkCacheKey(indexName, from, ++i, bufferSize, affinitySegmentId);
ob = chunksCache.get(fromChunkKey);
if (ob == null) {
break;
}
final ChunkCacheKey toChunkKey = new ChunkCacheKey(indexName, to, i, bufferSize, affinitySegmentId);
chunksCache.withFlags(Flag.IGNORE_RETURN_VALUES).put(toChunkKey, ob);
} while (true);
// rename metadata first
metadataCache.put(new FileCacheKey(indexName, to, affinitySegmentId), metadata);
fileOps.removeAndAdd(from, to);
// now trigger deletion of old file chunks:
readLocks.deleteOrReleaseReadLock(from);
if (trace) {
log.tracef("Renamed file from: %s to: %s in index %s from %s", from, to, indexName, getAddress(metadataCache));
}
}
long fileLength(final String name) {
final FileMetadata fileMetadata = fileOps.getFileMetadata(name);
if (fileMetadata == null) {
return 0L; //as in FSDirectory (RAMDirectory throws an exception instead)
}
else {
return fileMetadata.getSize();
}
}
IndexOutput createOutput(final String name) {
if(log.isDebugEnabled()) {
log.tracef("Creating output file %s in index %s from %s", name, indexName, getAddress(metadataCache));
}
if (IndexFileNames.SEGMENTS.equals(name)) {
return new InfinispanIndexOutput(metadataCache, chunksCache, segmentsGenFileKey, chunkSize, fileOps, affinitySegmentId);
}
else {
final FileCacheKey key = new FileCacheKey(indexName, name, affinitySegmentId);
// creating new file, metadata is added on flush() or close() of
// IndexOutPut
return new InfinispanIndexOutput(metadataCache, chunksCache, key, chunkSize, fileOps, affinitySegmentId);
}
}
IndexInputContext openInput(final String name) throws IOException {
final FileCacheKey fileKey = new FileCacheKey(indexName, name, affinitySegmentId);
FileMetadata fileMetadata;
try {
fileMetadata = metadataCache.get(fileKey);
}
catch (PersistenceException pe) {
//When loading through the LuceneCacheLoader, a valid FileNotFoundException would be wrapped by a PersistenceException:
//just ignore it so that we re-throw the needed FileNotFoundException
fileMetadata = null;
}
if (fileMetadata == null) {
throw new FileNotFoundException("Error loading metadata for index file: " + fileKey);
}
else if (!fileMetadata.isMultiChunked()) {
//files smaller than chunkSize don't need a readLock
return new IndexInputContext(chunksCache, fileKey, fileMetadata, null, affinitySegmentId);
}
else {
boolean locked = readLocks.acquireReadLock(name);
if (!locked) {
// safest reaction is to tell this file doesn't exist anymore.
throw new FileNotFoundException("Error loading metadata for index file: " + fileKey);
}
return new IndexInputContext(chunksCache, fileKey, fileMetadata, readLocks, affinitySegmentId);
}
}
/**
* @return The value of indexName, same constant as provided to the constructor.
*/
public String getIndexName() {
return indexName;
}
@Override
public String toString() {
return "DirectoryImplementor{indexName=\'" + indexName + "\'}";
}
public int getChunkSize() {
return chunkSize;
}
public Cache getMetadataCache() {
return metadataCache;
}
public Cache getDataCache() {
return chunksCache;
}
public Cache<Object, Integer> getDistLocksCache() {
return distLocksCache;
}
static Address getAddress(Cache<?, ?> cache) {
Address address = cache.getCacheManager().getAddress();
return address == null ? LocalModeAddress.INSTANCE : address;
}
}