org.elasticsearch.action.admin.cluster.tasks.TransportPendingClusterTasksAction Maven / Gradle / Ivy

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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.elasticsearch.action.admin.cluster.tasks;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.master.TransportMasterNodeReadAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.cluster.service.PendingClusterTask;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

import java.io.IOException;
import java.util.List;

public class TransportPendingClusterTasksAction
        extends TransportMasterNodeReadAction {

    private static final Logger logger = LogManager.getLogger(TransportPendingClusterTasksAction.class);

    private final ClusterService clusterService;

    @Inject
    public TransportPendingClusterTasksAction(TransportService transportService, ClusterService clusterService,
                                              ThreadPool threadPool, ActionFilters actionFilters,
                                              IndexNameExpressionResolver indexNameExpressionResolver) {
        super(PendingClusterTasksAction.NAME, transportService, clusterService, threadPool, actionFilters,
            PendingClusterTasksRequest::new, indexNameExpressionResolver);
        this.clusterService = clusterService;
    }

    @Override
    protected String executor() {
        // very lightweight operation in memory, no need to fork to a thread
        return ThreadPool.Names.SAME;
    }

    @Override
    protected PendingClusterTasksResponse read(StreamInput in) throws IOException {
        return new PendingClusterTasksResponse(in);
    }

    @Override
    protected ClusterBlockException checkBlock(PendingClusterTasksRequest request, ClusterState state) {
        return null;
    }

    @Override
    protected void masterOperation(PendingClusterTasksRequest request, ClusterState state,
                                   ActionListener listener) {
        logger.trace("fetching pending tasks from cluster service");
        final List pendingTasks = clusterService.getMasterService().pendingTasks();
        logger.trace("done fetching pending tasks from cluster service");
        listener.onResponse(new PendingClusterTasksResponse(pendingTasks));
    }
}