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Java client for Arcus memcached
There is a newer version: 1.14.0
/*
 * 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.CollectionResponse;
import net.spy.memcached.collection.CollectionUpdate;
import net.spy.memcached.ops.CollectionOperationStatus;
import net.spy.memcached.ops.CollectionUpdateOperation;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;

/**
 * Operation to update collection data in a memcached server.
 */
public class CollectionUpdateOperationImpl extends OperationImpl implements
		CollectionUpdateOperation {

	private static final int OVERHEAD = 32;

	private static final OperationStatus STORE_CANCELED = new CollectionOperationStatus(
			false, "collection canceled", CollectionResponse.CANCELED);

	private static final OperationStatus UPDATED = new CollectionOperationStatus(
			true, "UPDATED", CollectionResponse.UPDATED);
	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 NOTHING_TO_UPDATE = new CollectionOperationStatus(
			false, "NOTHING_TO_UPDATE", CollectionResponse.NOTHING_TO_UPDATE);
	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 EFLAG_MISMATCH = new CollectionOperationStatus(
			false, "EFLAG_MISMATCH", CollectionResponse.EFLAG_MISMATCH);
	private static final OperationStatus SERVER_ERROR = new CollectionOperationStatus(
			false, "SERVER_ERROR", CollectionResponse.SERVER_ERROR);

	protected final String key;
	protected final String subkey; // e.g.) 0 or 0x00
	protected final CollectionUpdate collectionUpdate;
	protected final byte[] data;

	public CollectionUpdateOperationImpl(String key, String subkey,
			CollectionUpdate collectionUpdate, byte[] data,
			OperationCallback cb) {
		super(cb);
		this.key = key;
		this.subkey = subkey;
		this.collectionUpdate = collectionUpdate;
		this.data = data;
	}

	@Override
	public void handleLine(String line) {
		assert getState() == OperationState.READING : "Read ``" + line
				+ "'' when in " + getState() + " state";
		getCallback().receivedStatus(
				matchStatus(line, UPDATED, NOT_FOUND, NOT_FOUND_ELEMENT,
						NOTHING_TO_UPDATE, TYPE_MISMATCH, BKEY_MISMATCH,
						EFLAG_MISMATCH, SERVER_ERROR));
		transitionState(OperationState.COMPLETE);
	}

	@Override
	public void initialize() {
		String args = collectionUpdate.stringify();

		ByteBuffer bb = ByteBuffer
				.allocate(((data != null) ? data.length : 0)
						+ KeyUtil.getKeyBytes(key).length
						+ KeyUtil.getKeyBytes(subkey).length
						+ KeyUtil.getKeyBytes(collectionUpdate
								.getElementFlagByHex()).length + args.length()
						+ OVERHEAD);

		setArguments(bb, collectionUpdate.getCommand(), key, subkey, args,
				((data != null) ? data.length : "-1"));

		if (data != null) {
			bb.put(data);
			bb.put(CRLF);
		}
		bb.flip();
		setBuffer(bb);

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

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

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

	public String getSubKey() {
		return subkey;
	}

	public CollectionUpdate getUpdate() {
		return collectionUpdate;
	}

	public byte[] getData() {
		return data;
	}

}