com.hazelcast.internal.ascii.memcache.SetCommandProcessor Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2016, 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.internal.ascii.memcache;
import com.hazelcast.internal.ascii.TextCommandConstants;
import com.hazelcast.internal.ascii.TextCommandService;
import com.hazelcast.core.HazelcastException;
import com.hazelcast.logging.ILogger;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.ADD;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.APPEND;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.PREPEND;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.REPLACE;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.SET;
import static com.hazelcast.util.StringUtil.stringToBytes;
public class SetCommandProcessor extends MemcacheCommandProcessor {
private final ILogger logger;
public SetCommandProcessor(TextCommandService textCommandService) {
super(textCommandService);
logger = textCommandService.getNode().getLogger(this.getClass().getName());
}
/**
* "set" means "store this data".
*
* "add" means "store this data, but only if the server *doesn't* already
* hold data for this key".
*
* "replace" means "store this data, but only if the server *does*
* already hold data for this key".
*
*
* After sending the command line and the data block the client awaits
* the reply, which may be:
*
* - "STORED\r\n", to indicate success.
*
* - "NOT_STORED\r\n" to indicate the data was not stored, but not
* because of an error. This normally means that either that the
* condition for an "add" or a "replace" command wasn't met, or that the
* item is in a delete queue (see the "delete" command below).
*/
public void handle(SetCommand setCommand) {
String key = null;
try {
key = URLDecoder.decode(setCommand.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);
}
Object value = new MemcacheEntry(setCommand.getKey(), setCommand.getValue(), setCommand.getFlag());
int ttl = textCommandService.getAdjustedTTLSeconds(setCommand.getExpiration());
textCommandService.incrementSetCount();
if (SET == setCommand.getType()) {
textCommandService.put(mapName, key, value, ttl);
setCommand.setResponse(TextCommandConstants.STORED);
} else if (ADD == setCommand.getType()) {
addCommandType(setCommand, mapName, key, value, ttl);
} else if (REPLACE == setCommand.getType()) {
replaceCommandType(setCommand, mapName, key, value, ttl);
} else if (APPEND == setCommand.getType()) {
appendCommandType(setCommand, mapName, key, ttl);
} else if (PREPEND == setCommand.getType()) {
prependCommandType(setCommand, mapName, key, ttl);
}
if (setCommand.shouldReply()) {
textCommandService.sendResponse(setCommand);
}
}
private void replaceCommandType(SetCommand setCommand, String mapName, String key, Object value, int ttl) {
boolean replaced = (textCommandService.replace(mapName, key, value) != null);
if (replaced) {
setCommand.setResponse(TextCommandConstants.STORED);
} else {
setCommand.setResponse(TextCommandConstants.NOT_STORED);
}
}
private void addCommandType(SetCommand setCommand, String mapName, String key, Object value, int ttl) {
boolean added = (textCommandService.putIfAbsent(mapName, key, value, ttl) == null);
if (added) {
setCommand.setResponse(TextCommandConstants.STORED);
} else {
setCommand.setResponse(TextCommandConstants.NOT_STORED);
}
}
private void prependCommandType(SetCommand setCommand, String mapName, String key, int ttl) {
try {
textCommandService.lock(mapName, key);
} catch (Exception e) {
setCommand.setResponse(TextCommandConstants.NOT_STORED);
if (setCommand.shouldReply()) {
textCommandService.sendResponse(setCommand);
}
return;
}
Object oldValue = textCommandService.get(mapName, key);
MemcacheEntry entry = null;
if (oldValue != null) {
if (oldValue instanceof MemcacheEntry) {
final MemcacheEntry oldEntry = (MemcacheEntry) oldValue;
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(setCommand.getValue(), oldEntry.getValue()), oldEntry.getFlag());
} else if (oldValue instanceof byte[]) {
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(setCommand.getValue(), ((byte[]) oldValue)), 0);
} else if (oldValue instanceof String) {
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(setCommand.getValue(), stringToBytes((String) oldValue)), 0);
} else {
try {
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(setCommand.getValue(), textCommandService.toByteArray(oldValue)), 0);
} catch (Exception e) {
logger.warning(e);
}
}
textCommandService.put(mapName, key, entry, ttl);
setCommand.setResponse(TextCommandConstants.STORED);
} else {
setCommand.setResponse(TextCommandConstants.NOT_STORED);
}
textCommandService.unlock(mapName, key);
}
private void appendCommandType(SetCommand setCommand, String mapName, String key, int ttl) {
try {
textCommandService.lock(mapName, key);
} catch (Exception e) {
setCommand.setResponse(TextCommandConstants.NOT_STORED);
if (setCommand.shouldReply()) {
textCommandService.sendResponse(setCommand);
}
return;
}
Object oldValue = textCommandService.get(mapName, key);
MemcacheEntry entry = null;
if (oldValue != null) {
if (oldValue instanceof MemcacheEntry) {
final MemcacheEntry oldEntry = (MemcacheEntry) oldValue;
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(oldEntry.getValue(), setCommand.getValue()), 0);
} else if (oldValue instanceof byte[]) {
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(((byte[]) oldValue), setCommand.getValue()), 0);
} else if (oldValue instanceof String) {
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(stringToBytes((String) oldValue), setCommand.getValue()), 0);
} else {
try {
entry = new MemcacheEntry(setCommand.getKey(),
concatenate(textCommandService.toByteArray(oldValue), setCommand.getValue()), 0);
} catch (Exception e) {
logger.warning(e);
}
}
textCommandService.put(mapName, key, entry, ttl);
setCommand.setResponse(TextCommandConstants.STORED);
} else {
setCommand.setResponse(TextCommandConstants.NOT_STORED);
}
textCommandService.unlock(mapName, key);
}
public void handleRejection(SetCommand request) {
request.setResponse(TextCommandConstants.NOT_STORED);
if (request.shouldReply()) {
textCommandService.sendResponse(request);
}
}
}
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