jstorm-core/src/main/java/com/alibaba/jstorm/daemon/worker/ContextMaker.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 com.alibaba.jstorm.daemon.worker;

import backtype.storm.generated.StormTopology;
import backtype.storm.generated.StreamInfo;
import backtype.storm.task.TopologyContext;
import backtype.storm.tuple.Fields;
import backtype.storm.utils.ThriftTopologyUtils;
import com.alibaba.jstorm.cluster.StormConfig;
import com.alibaba.jstorm.utils.JStormUtils;
import com.alibaba.jstorm.utils.PathUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

/**
 * ContextMaker This class is used to create TopologyContext
 * 
 * @author yannian/Longda
 * 
 */
public class ContextMaker {
    private static Logger LOG = LoggerFactory.getLogger(ContextMaker.class);

    private WorkerData workerData;

    private String resourcePath;
    private String pidDir;
    private String codeDir;
    private List<Integer> workerTasks;

    @SuppressWarnings("rawtypes")
    public ContextMaker(WorkerData workerData) {
        /*
         * Map stormConf, String topologyId, String workerId, HashMap<Integer, String> tasksToComponent, Integer port, List<Integer> workerTasks
         */
        this.workerData = workerData;
        this.workerTasks = JStormUtils.mk_list(workerData.getTaskids());

        try {
            Map stormConf = workerData.getStormConf();
            String topologyId = workerData.getTopologyId();
            String workerId = workerData.getWorkerId();

            String distroot = StormConfig.supervisor_stormdist_root(stormConf, topologyId);

            resourcePath = StormConfig.supervisor_storm_resources_path(distroot);

            pidDir = StormConfig.worker_pids_root(stormConf, workerId);

            String codePath = StormConfig.stormcode_path(distroot);
            codeDir = PathUtils.parent_path(codePath);

        } catch (IOException e) {
            LOG.error("Failed to create ContextMaker", e);
            throw new RuntimeException(e);
        }
    }

    public TopologyContext makeTopologyContext(StormTopology topology, Integer taskId, clojure.lang.Atom openOrPrepareWasCalled) {

        Map stormConf = workerData.getStormConf();
        String topologyId = workerData.getTopologyId();

        HashMap<String, Map<String, Fields>> componentToStreamToFields = new HashMap<String, Map<String, Fields>>();

        Set<String> components = ThriftTopologyUtils.getComponentIds(topology);
        for (String component : components) {

            Map<String, Fields> streamToFieldsMap = new HashMap<String, Fields>();

            Map<String, StreamInfo> streamInfoMap = ThriftTopologyUtils.getComponentCommon(topology, component).get_streams();
            for (Entry<String, StreamInfo> entry : streamInfoMap.entrySet()) {
                String streamId = entry.getKey();
                StreamInfo streamInfo = entry.getValue();

                streamToFieldsMap.put(streamId, new Fields(streamInfo.get_output_fields()));
            }

            componentToStreamToFields.put(component, streamToFieldsMap);
        }

        return new TopologyContext(topology, stormConf, workerData.getTasksToComponent(), workerData.getComponentToSortedTasks(), componentToStreamToFields,
                topologyId, resourcePath, pidDir, taskId, workerData.getPort(), workerTasks, workerData.getDefaultResources(), workerData.getUserResources(),
                workerData.getExecutorData(), workerData.getRegisteredMetrics(), openOrPrepareWasCalled, workerData.getZkCluster());

    }

}