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Java client for Arcus memcached
There is a newer version: 1.13.2
/*
 * arcus-java-client : Arcus Java client
 * Copyright 2010-2014 NAVER Corp.
 *
 * 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 net.spy.memcached.protocol.ascii;

import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Collections;

import net.spy.memcached.KeyUtil;
import net.spy.memcached.collection.BTreeMutate;
import net.spy.memcached.collection.CollectionMutate;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.CollectionMutateOperation;
import net.spy.memcached.ops.CollectionOperationStatus;
import net.spy.memcached.ops.Mutator;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;
import net.spy.memcached.ops.OperationType;

/**
 * Operation to incr/decr item value from collection in a memcached server.
 */
public class CollectionMutateOperationImpl extends OperationImpl implements
		CollectionMutateOperation {

	private static final OperationStatus GET_CANCELED = new CollectionOperationStatus(
			false, "collection canceled", CollectionResponse.CANCELED);
	private static final OperationStatus NOT_FOUND = new CollectionOperationStatus(
			false, "NOT_FOUND", CollectionResponse.NOT_FOUND);
	private static final OperationStatus NOT_FOUND_ELEMENT = new CollectionOperationStatus(
			false, "NOT_FOUND_ELEMENT", CollectionResponse.NOT_FOUND_ELEMENT);
	private static final OperationStatus TYPE_MISMATCH = new CollectionOperationStatus(
			false, "TYPE_MISMATCH", CollectionResponse.TYPE_MISMATCH);
	private static final OperationStatus BKEY_MISMATCH = new CollectionOperationStatus(
			false, "BKEY_MISMATCH", CollectionResponse.BKEY_MISMATCH);
	private static final OperationStatus UNREADABLE = new CollectionOperationStatus(
			false, "UNREADABLE", CollectionResponse.UNREADABLE);
	private static final OperationStatus OVERFLOWED = new CollectionOperationStatus(
			false, "OVERFLOWED", CollectionResponse.OVERFLOWED);
	private static final OperationStatus OUT_OF_RANGE = new CollectionOperationStatus(
			false, "OUT_OF_RANGE", CollectionResponse.OUT_OF_RANGE);

	protected final String key;
	protected final String subkey;
	protected final CollectionMutate collectionMutate;

	public CollectionMutateOperationImpl(String key, String subkey,
			CollectionMutate collectionMutate, OperationCallback cb) {
		super(cb);
		this.key = key;
		this.subkey = subkey;
		this.collectionMutate = collectionMutate;
		if (this.collectionMutate instanceof BTreeMutate) {
			if (((BTreeMutate) this.collectionMutate).getMutator() == Mutator.incr)
				setAPIType(APIType.BOP_INCR);
			else
				setAPIType(APIType.BOP_DECR);
		}
		setOperationType(OperationType.WRITE);
	}

	/**
	 * \r\n
	 */
	public void handleLine(String line) {

		OperationStatus status = null;

		/* ENABLE_REPLICATION if */
		if (line.equals("SWITCHOVER") || line.equals("REPL_SLAVE")) {
			receivedMoveOperations(line);
			return;
		}

		/* ENABLE_REPLICATION end */
		try {
			Long.valueOf(line);
			getCallback().receivedStatus(new OperationStatus(true, line));
		} catch (NumberFormatException e) {
			status = matchStatus(line, NOT_FOUND, NOT_FOUND_ELEMENT, TYPE_MISMATCH, BKEY_MISMATCH,
					UNREADABLE, OVERFLOWED, OUT_OF_RANGE);

			getLogger().debug(status);
			getCallback().receivedStatus(status);
		}

		transitionState(OperationState.COMPLETE);
	}

	public void initialize() {
		String cmd = collectionMutate.getCommand();
		String args = collectionMutate.stringify();
		ByteBuffer bb = ByteBuffer.allocate(KeyUtil.getKeyBytes(key).length
				+ KeyUtil.getKeyBytes(subkey).length
				+ cmd.length() + args.length() + 16);

		setArguments(bb, cmd, key, subkey, args);
		bb.flip();
		setBuffer(bb);

		if (getLogger().isDebugEnabled()) {
			getLogger().debug(
					"Request in ascii protocol: "
							+ (new String(bb.array()))
									.replace("\r\n", "\\r\\n"));
		}
	}

	@Override
	protected void wasCancelled() {
		getCallback().receivedStatus(GET_CANCELED);
	}

	public Collection getKeys() {
		return Collections.singleton(key);
	}

	public String getSubKey() {
		return subkey;
	}

}