| /* |
| * 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.geode.internal.memcached.commands; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.geode.cache.Cache; |
| import org.apache.geode.cache.Region; |
| import org.apache.geode.internal.memcached.Reply; |
| import org.apache.geode.internal.memcached.RequestReader; |
| import org.apache.geode.internal.memcached.ResponseStatus; |
| import org.apache.geode.internal.memcached.ValueWrapper; |
| |
| /** |
| * "prepend" means "add this data to an existing key before existing data". |
| * |
| * |
| */ |
| public class PrependCommand extends StorageCommand { |
| |
| @Override |
| public ByteBuffer processStorageCommand(String key, byte[] value, int flags, Cache cache) { |
| Region<Object, ValueWrapper> r = getMemcachedRegion(cache); |
| ValueWrapper oldValWrapper = r.get(key); |
| String retVal = Reply.NOT_FOUND.toString(); |
| if (oldValWrapper != null) { |
| byte[] oldVal = oldValWrapper.getValue(); |
| byte[] prependVal = (byte[]) value; |
| byte[] newVal = new byte[oldVal.length + prependVal.length]; |
| System.arraycopy(prependVal, 0, newVal, 0, prependVal.length); |
| System.arraycopy(oldVal, 0, newVal, prependVal.length, oldVal.length); |
| r.put(key, ValueWrapper.getWrappedValue(newVal, flags)); |
| retVal = Reply.STORED.toString(); |
| } |
| return asciiCharset.encode(retVal); |
| } |
| |
| @Override |
| public ByteBuffer processBinaryStorageCommand(Object key, byte[] value, long cas, int flags, |
| Cache cache, RequestReader request) { |
| ByteBuffer response = request.getResponse(); |
| Region<Object, ValueWrapper> r = getMemcachedRegion(cache); |
| try { |
| ValueWrapper oldValWrapper = r.get(key); |
| if (oldValWrapper != null) { |
| byte[] oldVal = oldValWrapper.getValue(); |
| byte[] prependVal = (byte[]) value; |
| byte[] newVal = new byte[oldVal.length + prependVal.length]; |
| System.arraycopy(prependVal, 0, newVal, 0, prependVal.length); |
| System.arraycopy(oldVal, 0, newVal, prependVal.length, oldVal.length); |
| ValueWrapper val = ValueWrapper.getWrappedValue(newVal, flags); |
| r.put(key, val); |
| if (isQuiet()) { |
| return null; |
| } |
| response.putShort(POSITION_RESPONSE_STATUS, ResponseStatus.NO_ERROR.asShort()); |
| response.putLong(POSITION_CAS, val.getVersion()); |
| } else { |
| response.putShort(POSITION_RESPONSE_STATUS, ResponseStatus.KEY_NOT_FOUND.asShort()); |
| } |
| } catch (Exception e) { |
| response = handleBinaryException(key, request, response, "prepend", e); |
| } |
| return response; |
| } |
| |
| /** |
| * Overridden by Q command |
| */ |
| protected boolean isQuiet() { |
| return false; |
| } |
| } |