/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hedwig.server.persistence;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.google.protobuf.ByteString;
import org.apache.hedwig.exceptions.PubSubException.ServiceDownException;
import org.apache.hedwig.protocol.PubSubProtocol.Message;
import org.apache.hedwig.protocol.PubSubProtocol.MessageSeqId;
import org.apache.hedwig.protoextensions.MessageIdUtils;
import org.apache.hedwig.server.persistence.ScanCallback.ReasonForFinish;
public class StubPersistenceManager implements PersistenceManagerWithRangeScan {
Map<ByteString, List<Message>> messages = new HashMap<ByteString, List<Message>>();
boolean failure = false;
ServiceDownException exception = new ServiceDownException("Asked to fail");
public void deliveredUntil(ByteString topic, Long seqId) {
// noop
}
public void consumedUntil(ByteString topic, Long seqId) {
// noop
}
protected static class ArrayListMessageFactory implements Factory<List<Message>> {
static ArrayListMessageFactory instance = new ArrayListMessageFactory();
public List<Message> newInstance() {
return new ArrayList<Message>();
}
}
public MessageSeqId getCurrentSeqIdForTopic(ByteString topic) {
long seqId = MapMethods.getAfterInsertingIfAbsent(messages, topic, ArrayListMessageFactory.instance).size();
return MessageSeqId.newBuilder().setLocalComponent(seqId).build();
}
public long getSeqIdAfterSkipping(ByteString topic, long seqId, int skipAmount) {
return seqId + skipAmount;
}
public void persistMessage(PersistRequest request) {
if (failure) {
request.callback.operationFailed(request.getCtx(), exception);
return;
}
MapMethods.addToMultiMap(messages, request.getTopic(), request.getMessage(), ArrayListMessageFactory.instance);
request.callback.operationFinished(request.getCtx(), (long) messages.get(request.getTopic()).size());
}
public void scanSingleMessage(ScanRequest request) {
if (failure) {
request.getCallback().scanFailed(request.getCtx(), exception);
return;
}
request.getCallback().messageScanned(request.getCtx(),
messages.get(request.getTopic()).get((int) request.getStartSeqId()));
}
public void scanMessages(RangeScanRequest request) {
if (failure) {
request.getCallback().scanFailed(request.getCtx(), exception);
return;
}
long totalSize = 0;
long startSeqId = request.getStartSeqId();
for (int i = 0; i < request.getMessageLimit(); i++) {
List<Message> messageList = MapMethods.getAfterInsertingIfAbsent(messages, request.getTopic(),
ArrayListMessageFactory.instance);
if (startSeqId + i > messageList.size()) {
request.getCallback().scanFinished(request.getCtx(), ReasonForFinish.NO_MORE_MESSAGES);
return;
}
Message msg = messageList.get((int) startSeqId + i - 1);
Message toDeliver = MessageIdUtils.mergeLocalSeqId(msg, startSeqId + i);
request.getCallback().messageScanned(request.getCtx(), toDeliver);
totalSize += toDeliver.getBody().size();
if (totalSize > request.getSizeLimit()) {
request.getCallback().scanFinished(request.getCtx(), ReasonForFinish.SIZE_LIMIT_EXCEEDED);
return;
}
}
request.getCallback().scanFinished(request.getCtx(), ReasonForFinish.NUM_MESSAGES_LIMIT_EXCEEDED);
}
}