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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.distributed.internal.deadlock;

import java.io.Serializable;
import java.util.Set;

/**
 * This interface defines the contract between the {@link DependencyMonitorManager} class
 * and classes that monitor a particular type of dependency. Classes implementing
 * this interface should register themselves with the dependency monitor using
 * the {@link DependencyMonitorManager#addMonitor(DependencyMonitor)} method.
 * 
 * @author dsmith
 */
public interface DependencyMonitor {
  /**
   * Return a map of resource identifiers to the threads that are blocked
   * waiting for those resources.
   */
  public Set> getBlockedThreads(
      Thread[] allThreads);

  /**
   * Return a map of resource indentifiers to the threads that hold that
   * particular resource.
   */
  public Set> getHeldResources(
      Thread[] allThreads);

}