/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.ascii.memcache;
import com.hazelcast.ascii.TextCommandConstants;
import com.hazelcast.ascii.TextCommandServiceImpl;
import com.hazelcast.core.HazelcastException;
import com.hazelcast.logging.ILogger;
import com.hazelcast.util.ByteUtil;
import com.hazelcast.util.ExceptionUtil;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import static com.hazelcast.util.StringUtil.stringToBytes;
/**
* User: sancar
* Date: 3/8/13
* Time: 3:51 PM
*/
public class IncrementCommandProcessor extends MemcacheCommandProcessor<IncrementCommand> {
private final ILogger logger;
public IncrementCommandProcessor(TextCommandServiceImpl textCommandService) {
super(textCommandService);
logger = textCommandService.getNode().getLogger(this.getClass().getName());
}
public void handle(IncrementCommand incrementCommand) {
String key = null;
try {
key = URLDecoder.decode(incrementCommand.getKey(), "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new HazelcastException(e);
}
String mapName = DEFAULT_MAP_NAME;
int index = key.indexOf(':');
if (index != -1) {
mapName = MAP_NAME_PRECEDER + key.substring(0, index);
key = key.substring(index + 1);
}
try {
textCommandService.lock(mapName, key);
} catch (Exception e) {
incrementCommand.setResponse(TextCommandConstants.NOT_FOUND);
if (incrementCommand.shouldReply()) {
textCommandService.sendResponse(incrementCommand);
}
return;
}
incrementUnderLock(incrementCommand, key, mapName);
textCommandService.unlock(mapName, key);
if (incrementCommand.shouldReply()) {
textCommandService.sendResponse(incrementCommand);
}
}
private void incrementUnderLock(IncrementCommand incrementCommand, String key, String mapName) {
Object value = textCommandService.get(mapName, key);
MemcacheEntry entry = null;
if (value != null) {
if (value instanceof MemcacheEntry) {
entry = (MemcacheEntry) value;
} else if (value instanceof byte[]) {
entry = new MemcacheEntry(incrementCommand.getKey(), (byte[]) value, 0);
} else if (value instanceof String) {
entry = new MemcacheEntry(incrementCommand.getKey(), stringToBytes((String) value), 0);
} else {
try {
entry = new MemcacheEntry(incrementCommand.getKey(), textCommandService.toByteArray(value), 0);
} catch (Exception e) {
throw ExceptionUtil.rethrow(e);
}
}
final byte[] value1 = entry.getValue();
final long current = (value1 == null || value1.length == 0) ? 0 : byteArrayToLong(value1);
long result = -1;
result = incrementCommandTypeCheck(incrementCommand, result, current);
incrementCommand.setResponse(ByteUtil.concatenate(stringToBytes(String.valueOf(result))
, TextCommandConstants.RETURN));
MemcacheEntry newValue = new MemcacheEntry(key, longToByteArray(result), entry.getFlag());
textCommandService.put(mapName, key, newValue);
} else {
if (incrementCommand.getType() == TextCommandConstants.TextCommandType.INCREMENT) {
textCommandService.incrementIncMissCount();
} else {
textCommandService.incrementDecrMissCount();
}
incrementCommand.setResponse(TextCommandConstants.NOT_FOUND);
}
}
public void handleRejection(IncrementCommand incrementCommand) {
incrementCommand.setResponse(TextCommandConstants.NOT_FOUND);
if (incrementCommand.shouldReply()) {
textCommandService.sendResponse(incrementCommand);
}
}
private long incrementCommandTypeCheck(IncrementCommand incrementCommand, long result, long current) {
long paramResult = result;
if (incrementCommand.getType() == TextCommandConstants.TextCommandType.INCREMENT) {
paramResult = current + incrementCommand.getValue();
paramResult = 0 > paramResult ? Long.MAX_VALUE : paramResult;
textCommandService.incrementIncHitCount();
} else if (incrementCommand.getType() == TextCommandConstants.TextCommandType.DECREMENT) {
paramResult = current - incrementCommand.getValue();
paramResult = 0 > paramResult ? 0 : paramResult;
textCommandService.incrementDecrHitCount();
}
return paramResult;
}
}