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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.CollectionResponse;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.CollectionOperationStatus;
import net.spy.memcached.ops.GetAttrOperation;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;
import net.spy.memcached.ops.OperationType;

/**
 * Implementation of the gets operation.
 */
class GetAttrOperationImpl extends OperationImpl implements GetAttrOperation {

	private static final String CMD = "getattr";

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

	private static final OperationStatus END = new CollectionOperationStatus(
			true, "END", CollectionResponse.END);
	private static final OperationStatus NOT_FOUND = new CollectionOperationStatus(
			false, "NOT_FOUND", CollectionResponse.NOT_FOUND);
	private static final OperationStatus ATTR_ERROR_NOT_FOUND = new CollectionOperationStatus(
			false, "ATTR_ERROR not found",
			CollectionResponse.ATTR_ERROR_NOT_FOUND);

	protected final String key;
	protected final GetAttrOperation.Callback cb;

	public GetAttrOperationImpl(String key, GetAttrOperation.Callback cb) {
		super(cb);
		this.key = key;
		this.cb = cb;
		setAPIType(APIType.GETATTR);
		setOperationType(OperationType.READ);
	}

	@Override
	public void handleLine(String line) {
		OperationStatus status = matchStatus(line, END, NOT_FOUND,
				ATTR_ERROR_NOT_FOUND);

		if (line.startsWith("ATTR ")) {
			getLogger().debug("Got line %s", line);

			String[] stuff = line.split(" ");

			assert stuff.length == 2;
			assert stuff[0].equals("ATTR");

			cb.gotAttribute(key, stuff[1]);
		} else if (status.isSuccess()) {
			getLogger().debug(status);
			getCallback().receivedStatus(status);
			transitionState(OperationState.COMPLETE);
		} else {
			getLogger().debug(status);
			getCallback().receivedStatus(status);
			transitionState(OperationState.COMPLETE);
		}
	}

	@Override
	public void initialize() {
		int size = CMD.length() + KeyUtil.getKeyBytes(key).length + 16;
		ByteBuffer bb = ByteBuffer.allocate(size);
		setArguments(bb, CMD, key);
		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(ATTR_CANCELED);
	}

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

}