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Java client for Arcus memcached
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/*
 * 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.Attributes;
import net.spy.memcached.collection.CollectionAttributes;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.ops.APIType;
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;
import net.spy.memcached.ops.SetAttrOperation;

class SetAttrOperationImpl extends OperationImpl
		implements SetAttrOperation {

	private static final int OVERHEAD = 64;

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

	private static final OperationStatus OK =
		new CollectionOperationStatus(true, "OK", CollectionResponse.OK);
	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);
	private static final OperationStatus ATTR_ERROR_BAD_VALUE =
		new CollectionOperationStatus(false, "ATTR_ERROR bad value", CollectionResponse.ATTR_ERROR_BAD_VALUE);

	protected final String key;
	protected final Attributes attrs;

	public SetAttrOperationImpl(String key, Attributes attrs,
			OperationCallback cb) {
		super(cb);
		this.key = key;
		// If no attributes given, set to default values
		this.attrs = (attrs == null)? new CollectionAttributes() : attrs;
		setAPIType(APIType.SETATTR);
		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);
		}

		/* ENABLE_REPLICATION end */
		getCallback().receivedStatus(
				matchStatus(line, OK, NOT_FOUND, ATTR_ERROR_NOT_FOUND,
						ATTR_ERROR_BAD_VALUE));
		transitionState(OperationState.COMPLETE);
	}

	@Override
	public void initialize() {
		ByteBuffer bb=ByteBuffer.allocate(KeyUtil.getKeyBytes(key).length +
			attrs.getLength() + OVERHEAD);

		setArguments(bb, "setattr", key, attrs);

		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);
	}

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

	public Attributes getAttributes() {
		return attrs;
	}

}