/*

 * Copyright (C) 2016 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>

 *

 * This library is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License, version 2.1 only,

 * as published by the Free Software Foundation.

 *

 * This library is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License

 * for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this library; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

package org.lttng.ust.agent.client;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

/**

 * Session daemon command indicating to the Java agent that an

 * application-specific context was disabled in the tracing session.

 *

 * @author Alexandre Montplaisir

 */

class SessiondDisableAppContextCommand extends SessiondCommand {

	private final String retrieverName;

	private final String contextName;

	private final boolean commandIsValid;

	public SessiondDisableAppContextCommand(byte[] data) {

		if (data == null) {

			throw new IllegalArgumentException();

		}

		ByteBuffer buf = ByteBuffer.wrap(data);

		buf.order(ByteOrder.BIG_ENDIAN);

		/*

		 * The buffer contains the retriever name first, followed by the

		 * context's name.

		 */

		retrieverName = readNextString(buf);

		contextName = readNextString(buf);

		/* If any of these strings were null then the command was invalid */

		commandIsValid = ((retrieverName != null) && (contextName != null));

	}

	@Override

	public LttngAgentResponse execute(ILttngTcpClientListener agent) {

		if (!commandIsValid) {

			return LttngAgentResponse.FAILURE_RESPONSE;

		}

		boolean success = agent.appContextDisabled(retrieverName, contextName);

		return (success ? LttngAgentResponse.SUCESS_RESPONSE : DISABLE_APP_CONTEXT_FAILURE_RESPONSE);

	}

	/**

	 * Response sent when the disable-context command asks to disable an

	 * unknown context name.

	 */

	private static final LttngAgentResponse DISABLE_APP_CONTEXT_FAILURE_RESPONSE = new LttngAgentResponse() {

		@Override

		public ReturnCode getReturnCode() {

			/* Same return code used for unknown event/logger names */

			return ReturnCode.CODE_UNKNOWN_LOGGER_NAME;

		}

	};

}