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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.collection.CollectionPipedUpdate;
import net.spy.memcached.collection.CollectionPipedUpdate.BTreePipedUpdate;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.CollectionOperationStatus;
import net.spy.memcached.ops.CollectionPipedUpdateOperation;
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 CollectionPipedUpdateOperationImpl extends OperationImpl implements
		CollectionPipedUpdateOperation {

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

	private static final OperationStatus END = new CollectionOperationStatus(
			true, "END", CollectionResponse.END);
	private static final OperationStatus FAILED_END = new CollectionOperationStatus(
			false, "END", CollectionResponse.END);

	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 CollectionPipedUpdate update;
	protected final CollectionPipedUpdateOperation.Callback cb;

	protected int count;
	protected int index = 0;
	protected boolean successAll = true;

	public CollectionPipedUpdateOperationImpl(String key,
			CollectionPipedUpdate update, OperationCallback cb) {
		super(cb);
		this.key = key;
		this.update = update;
		this.cb = (Callback) cb;
		if (this.update instanceof BTreePipedUpdate)
			setAPIType(APIType.BOP_UPDATE);
		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 */
		if (update.getItemCount() == 1) {
			OperationStatus status = matchStatus(line, UPDATED, NOT_FOUND,
					NOT_FOUND_ELEMENT, NOTHING_TO_UPDATE, TYPE_MISMATCH,
					BKEY_MISMATCH, EFLAG_MISMATCH, SERVER_ERROR);
			if (status.isSuccess()) {
				cb.receivedStatus(END);
			} else {
				cb.gotStatus(index, status);
				cb.receivedStatus(FAILED_END);
			}
			transitionState(OperationState.COMPLETE);
			return;
		}

		if (line.startsWith("END") || line.startsWith("PIPE_ERROR ")) {
			cb.receivedStatus((successAll) ? END : FAILED_END);
			transitionState(OperationState.COMPLETE);
		} else if (line.startsWith("RESPONSE ")) {
			getLogger().debug("Got line %s", line);

			// TODO server should be fixed
			line = line.replace("   ", " ");
			line = line.replace("  ", " ");

			String[] stuff = line.split(" ");
			assert "RESPONSE".equals(stuff[0]);
			count = Integer.parseInt(stuff[1]);
		} else {
			OperationStatus status = matchStatus(line, UPDATED, NOT_FOUND,
					NOT_FOUND_ELEMENT, NOTHING_TO_UPDATE, TYPE_MISMATCH,
					BKEY_MISMATCH, EFLAG_MISMATCH, SERVER_ERROR);

			if (!status.isSuccess()) {
				cb.gotStatus(index, status);
				successAll = false;
			}
			index++;
		}
	}

	@Override
	public void initialize() {
		ByteBuffer buffer = update.getAsciiCommand();
		setBuffer(buffer);

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

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

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

	public CollectionPipedUpdate getUpdate() {
		return update;
	}

}