net.spy.memcached.protocol.ascii.CollectionCountOperationImpl Maven / Gradle / Ivy

Go to download
/*
 * 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.BTreeCount;
import net.spy.memcached.collection.CollectionCount;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.CollectionCountOperation;
import net.spy.memcached.ops.CollectionOperationStatus;
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 get exists item count from collection in a memcached server.
 */
public class CollectionCountOperationImpl extends OperationImpl implements
		CollectionCountOperation {

	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 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);

	protected final String key;
	protected final CollectionCount collectionCount;

	protected int count = 0;

	public CollectionCountOperationImpl(String key,
			CollectionCount collectionCount, OperationCallback cb) {
		super(cb);
		this.key = key;
		this.collectionCount = collectionCount;
		if (this.collectionCount instanceof BTreeCount)
			setAPIType(APIType.BOP_COUNT);
		setOperationType(OperationType.READ);
	}

	/**
	 * VALUE  \r\n
	 */
	public void handleLine(String line) {
		if (line.startsWith("COUNT=")) {
			getLogger().debug("Got line %s", line);

			String[] stuff = line.split("=");
			assert "COUNT".equals(stuff[0]);
			count = Integer.parseInt(stuff[1]);

			getCallback().receivedStatus(
					new CollectionOperationStatus(new OperationStatus(true,
							String.valueOf(count))));
			transitionState(OperationState.COMPLETE);
		} else {
			OperationStatus status = matchStatus(line, NOT_FOUND, TYPE_MISMATCH, BKEY_MISMATCH, UNREADABLE);
			getLogger().debug(status);
			getCallback().receivedStatus(status);
			transitionState(OperationState.COMPLETE);
			return;
		}
	}

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

		setArguments(bb, cmd, key, 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);
	}
}