/*
 * 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.index.reindex;

import org.elasticsearch.action.FailedNodeException;
import org.elasticsearch.action.TaskOperationFailure;
import org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksResponse;
import org.elasticsearch.action.admin.cluster.node.tasks.list.TaskInfo;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.tasks.TransportTasksAction;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

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

public class TransportRethrottleAction extends TransportTasksAction<BulkByScrollTask, RethrottleRequest, ListTasksResponse, TaskInfo> {
    @Inject
    public TransportRethrottleAction(Settings settings, ClusterName clusterName, ThreadPool threadPool, ClusterService clusterService,
            TransportService transportService, ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver) {
        super(settings, RethrottleAction.NAME, clusterName, threadPool, clusterService, transportService, actionFilters,
                indexNameExpressionResolver, new Callable<RethrottleRequest>() {
                    @Override
                    public RethrottleRequest call() throws Exception {
                        return new RethrottleRequest();
                    }
                }, ThreadPool.Names.MANAGEMENT);
    }

    @Override
    protected TaskInfo taskOperation(RethrottleRequest request, BulkByScrollTask task) {
        // Apply the new throttle and fetch status of the task. The user might not want that status but they likely do and it is cheap.
        task.rethrottle(request.getRequestsPerSecond());
        return task.taskInfo(clusterService.localNode(), true);
    }

    @Override
    protected TaskInfo readTaskResponse(StreamInput in) throws IOException {
        return new TaskInfo(in);
    }

    @Override
    protected ListTasksResponse newResponse(RethrottleRequest request, List<TaskInfo> tasks,
            List<TaskOperationFailure> taskOperationFailures, List<FailedNodeException> failedNodeExceptions) {
        return new ListTasksResponse(tasks, taskOperationFailures, failedNodeExceptions);
    }

    @Override
    protected boolean accumulateExceptions() {
        return true;
    }
}