org.kiji.rest.resources.ShutdownTask.java Source code

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Here is the source code for org.kiji.rest.resources.ShutdownTask.java

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/**
 * (c) Copyright 2014 WibiData, Inc.
 *
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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 org.kiji.rest.resources;

import java.io.PrintWriter;
import java.util.Collection;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;

import com.google.common.collect.ImmutableMultimap;
import com.yammer.dropwizard.tasks.Task;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.kiji.rest.KijiRESTConfiguration;
import org.kiji.rest.ManagedKijiClient;

/**
 * This REST task allows administrators to shutdown the system.
 */
public class ShutdownTask extends Task {
    private static final Logger LOG = LoggerFactory.getLogger(ShutdownTask.class);

    private final KijiRESTConfiguration mKijiRESTConfiguration;
    private final ManagedKijiClient mManagedKijiClient;

    /**
     * Create a ShutdownTask with the provided KijiClient.
     *
     * @param managedKijiClient the client that will be gracefully shut down.
     * @param configuration to use to examine if shutdown is available.
     */
    public ShutdownTask(ManagedKijiClient managedKijiClient, KijiRESTConfiguration configuration) {
        super("shutdown");
        mManagedKijiClient = managedKijiClient;
        mKijiRESTConfiguration = configuration;
    }

    /** {@inheritDoc} */
    @Override
    public void execute(ImmutableMultimap<String, String> parameters, PrintWriter output) throws Exception {
        final Collection<String> commands = parameters.get("force");

        if (mKijiRESTConfiguration.isShutdownEnabled()) {
            // Presence of "force" parameter will trigger a forced shutdown.
            if (commands.size() == 0) {
                mManagedKijiClient.stop();
                output.println("Server has been shutdown");
                output.flush();
            }
            System.exit(0);
        } else {
            throw new WebApplicationException(
                    new IllegalArgumentException("Remote shutdown is disabled. Enable by setting the "
                            + "remote-shutdown command to true in the configuration file."),
                    Response.Status.BAD_REQUEST);
        }
    }
}