org.modeshape.jcr.value.binary.infinispan.ChunkOutputStream Maven / Gradle / Ivy
/*
* ModeShape (http://www.modeshape.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.modeshape.jcr.value.binary.infinispan;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.infinispan.Cache;
import org.modeshape.common.logging.Logger;
/**
* This stream writes data as chunks into separate cache entries.
*/
class ChunkOutputStream extends OutputStream {
protected static final Logger LOGGER = Logger.getLogger(ChunkOutputStream.class);
private static final int BUFFER_SIZE = 1024;
protected final Cache blobCache;
protected final String keyPrefix;
protected int chunkIndex;
private final ByteArrayOutputStream chunkBuffer;
private final int chunkSize;
private boolean closed;
protected ChunkOutputStream( Cache blobCache,
String keyPrefix ) {
this(blobCache, keyPrefix, InfinispanBinaryStore.DEFAULT_CHUNK_SIZE);
}
protected ChunkOutputStream( Cache blobCache,
String keyPrefix,
int chunkSize ) {
this.blobCache = blobCache;
this.keyPrefix = keyPrefix;
this.chunkIndex = 0;
this.chunkBuffer = new ByteArrayOutputStream(BUFFER_SIZE);
this.chunkSize = chunkSize;
}
protected int chunksCount() {
return chunkIndex;
}
@Override
public void write( int b ) throws IOException {
if (chunkBuffer.size() == chunkSize) {
storeBufferInBLOBCache();
}
chunkBuffer.write(b);
}
@Override
public void write( byte[] b,
int off,
int len ) throws IOException {
if (len + chunkBuffer.size() <= chunkSize) {
chunkBuffer.write(b, off, len);
} else {
int storeLength = chunkSize - chunkBuffer.size();
write(b, off, storeLength);
storeBufferInBLOBCache();
write(b, off + storeLength, len - storeLength);
}
}
@Override
public void close() throws IOException {
LOGGER.debug("Close. Buffer size at close: {0}", chunkBuffer.size());
if (closed) {
LOGGER.debug("Stream already closed.");
return;
}
closed = true;
// store last chunk
if (chunkBuffer.size() > 0) {
storeBufferInBLOBCache();
}
}
private void storeBufferInBLOBCache() throws IOException {
final byte[] chunk = chunkBuffer.toByteArray();
try {
new RetryOperation() {
@Override
protected boolean call() {
String chunkKey = keyPrefix + "-" + chunkIndex;
LOGGER.debug("Store chunk {0}", chunkKey);
blobCache.put(chunkKey, chunk);
return true;
}
}.doTry();
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException(e);
}
chunkIndex++;
chunkBuffer.reset();
}
}
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