storm-server/src/main/java/org/apache/storm/scheduler/ISupervisor.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 org.apache.storm.scheduler;

import java.util.Collection;
import java.util.Map;

public interface ISupervisor {

    void prepare(Map<String, Object> topoConf, String schedulerLocalDir);

    // for mesos, this is {hostname}-{topologyid}

    /**
     * The id used for writing metadata into ZK.
     */
    String getSupervisorId();

    /**
     * The id used in assignments. This combined with confirmAssigned decides what
     * this supervisor is responsible for. The combination of this and getSupervisorId
     * allows Nimbus to assign to a single machine and have multiple supervisors
     * on that machine execute the assignment. This is important for achieving resource isolation.
     */
    String getAssignmentId();

    Object getMetadata();

    boolean confirmAssigned(int port);

    // calls this before actually killing the worker locally...
    // sends a "task finished" update
    void killedWorker(int port);

    void assigned(Collection<Integer> ports);
}