content: /**
   * 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 backtype.storm.scheduler;
  
  import java.util.Map;
  
  public interface IScheduler {
  
      void prepare(Map conf);
  
      /**
       * Set assignments for the topologies which needs scheduling. The new assignments is available through <code>cluster.getAssignments()</code>
       *
       * @param topologies all the topologies in the cluster, some of them need schedule. Topologies object here only contain static information about topologies.
       *                   Information like assignments, slots are all in the <code>cluster</code>object.
       * @param cluster    the cluster these topologies are running in. <code>cluster</code> contains everything user need to develop a new scheduling logic. e.g.
       *                   supervisors information, available slots, current assignments for all the topologies etc. User can set the new assignment for topologies using
       *                   <code>cluster.setAssignmentById</code>
       */
      void schedule(Topologies topologies, Cluster cluster);
  }
  