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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.BTreeUpsert;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.collection.CollectionStore;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.CollectionOperationStatus;
import net.spy.memcached.ops.CollectionUpsertOperation;
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 store collection data in a memcached server.
 */
public class CollectionUpsertOperationImpl extends OperationImpl implements
		CollectionUpsertOperation {

	private static final int OVERHEAD = 32;

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

	private static final OperationStatus CREATED_STORED = new CollectionOperationStatus(
			true, "CREATED_STORED", CollectionResponse.CREATED_STORED);
	private static final OperationStatus STORED = new CollectionOperationStatus(
			true, "STORED", CollectionResponse.STORED);
	private static final OperationStatus REPLACED = new CollectionOperationStatus(
			true, "REPLACED", CollectionResponse.REPLACED);
	private static final OperationStatus NOT_FOUND = new CollectionOperationStatus(
			false, "NOT_FOUND", CollectionResponse.NOT_FOUND);
	private static final OperationStatus ELEMENT_EXISTS = new CollectionOperationStatus(
			false, "ELEMENT_EXISTS", CollectionResponse.ELEMENT_EXISTS);
	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);
	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);

	protected final String key;
	protected final String subkey;
	protected final CollectionStore collectionStore;
	protected final byte[] data;

	public CollectionUpsertOperationImpl(String key, String subkey,
			CollectionStore collectionStore, byte[] data,
			OperationCallback cb) {
		super(cb);
		this.key = key;
		this.subkey = subkey;
		this.collectionStore = collectionStore;
		this.data = data;
		if (this.collectionStore instanceof BTreeUpsert)
			setAPIType(APIType.BOP_UPSERT);
		setOperationType(OperationType.WRITE);
	}

	@Override
	public void handleLine(String line) {
		assert getState() == OperationState.READING : "Read ``" + line
				+ "'' when in " + getState() + " state";
		/* ENABLE_REPLICATION if */
		if (line.equals("SWITCHOVER") || line.equals("REPL_SLAVE")) {
			receivedMoveOperations(line);
			return;
		}

		/* ENABLE_REPLICATION end */
		getCallback().receivedStatus(
				matchStatus(line, STORED, REPLACED, CREATED_STORED, NOT_FOUND,
						ELEMENT_EXISTS, OVERFLOWED, OUT_OF_RANGE,
						TYPE_MISMATCH, BKEY_MISMATCH));
		transitionState(OperationState.COMPLETE);
	}

	@Override
	public void initialize() {
		String args = collectionStore.stringify();
		ByteBuffer bb = ByteBuffer
				.allocate(data.length
						+ KeyUtil.getKeyBytes(key).length
						+ KeyUtil.getKeyBytes(subkey).length
						+ KeyUtil.getKeyBytes(collectionStore.getElementFlagByHex()).length
						+ args.length()
						+ OVERHEAD);
		setArguments(bb, collectionStore.getCommand(), key, subkey,
				collectionStore.getElementFlagByHex(), data.length, args);
		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 CollectionStore getStore() {
		return collectionStore;
	}

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

}