/*
* 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.geode.distributed.internal.deadlock;
import java.io.Serializable;
/**
* Holds a dependency between one object and another. This class is used as an edge in the @link
* {@link DependencyGraph}.
*
* An example of a dependency is a Thread that is blocking on a lock, or a lock that is held by a
* thread.
*
*
*/
public class Dependency<A, B> implements Serializable {
private static final long serialVersionUID = 1L;
public final A depender;
public final B dependsOn;
public Dependency(A depender, B dependsOn) {
this.depender = depender;
this.dependsOn = dependsOn;
}
public A getDepender() {
return depender;
}
public B getDependsOn() {
return dependsOn;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((depender == null) ? 0 : depender.hashCode());
result = prime * result + ((dependsOn == null) ? 0 : dependsOn.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof Dependency))
return false;
Dependency<?, ?> other = (Dependency<?, ?>) obj;
if (depender == null) {
if (other.depender != null)
return false;
} else if (!depender.equals(other.depender))
return false;
if (dependsOn == null) {
if (other.dependsOn != null)
return false;
} else if (!dependsOn.equals(other.dependsOn))
return false;
return true;
}
@Override
public String toString() {
return depender + " -> " + dependsOn;
}
}