com.arangodb.vst.internal.ChunkStore Maven / Gradle / Ivy
/*
* DISCLAIMER
*
* Copyright 2016 ArangoDB GmbH, Cologne, Germany
*
* 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.
*
* Copyright holder is ArangoDB GmbH, Cologne, Germany
*/
package com.arangodb.vst.internal;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
/**
* @author Mark Vollmary
*/
public class ChunkStore {
private final MessageStore messageStore;
private final Map data;
public ChunkStore(final MessageStore messageStore) {
super();
this.messageStore = messageStore;
data = new HashMap<>();
}
public ByteBuffer storeChunk(final Chunk chunk) throws BufferUnderflowException, IndexOutOfBoundsException {
final long messageId = chunk.getMessageId();
ByteBuffer chunkBuffer = data.get(messageId);
if (chunkBuffer == null) {
if (!chunk.isFirstChunk()) {
messageStore.cancel(messageId);
return null;
}
final int length = (int) (chunk.getMessageLength() > 0 ? chunk.getMessageLength()
: chunk.getContentLength());
chunkBuffer = ByteBuffer.allocate(length);
data.put(messageId, chunkBuffer);
}
return chunkBuffer;
}
public void checkCompleteness(final long messageId) {
checkCompleteness(messageId, data.get(messageId));
}
private void checkCompleteness(final long messageId, final ByteBuffer chunkBuffer)
throws BufferUnderflowException, IndexOutOfBoundsException {
if (chunkBuffer.position() == chunkBuffer.limit()) {
messageStore.consume(new Message(messageId, chunkBuffer.array()));
data.remove(messageId);
}
}
}