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RecoveryStrategies.java
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RecoveryStrategies.java
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/*
* Copyright 2015 the original author or authors.
*
* 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
*/
package io.atomix.copycat.client;
/**
* Strategies for recovering lost client sessions.
* <p>
* Client recovery strategies are responsible for recovering a crashed client. When clients fail to contact
* a server for more than their session timeout, the client's session must be closed as linearizability is
* lost. The recovery strategy has the opportunity to recover the crashed client gracefully.
*
* @author <a href="http://github.com/kuujo>Jordan Halterman</a>
*/
public enum RecoveryStrategies implements RecoveryStrategy {
/**
* The {@code CLOSE} strategy closes the client once its session is expired. A failure will result in
* exceptions for any commands submitted to the cluster. This ensures that users of the client cannot
* operate on the cluster state while linearizability is lost.
*/
CLOSE {
@Override
public void recover(CopycatClient client) {
client.close();
}
},
/**
* The {@code RECOVER} strategy handles expired client sessions by recovering the session. Linearizable semantics
* will be lost between commands across sessions.
*/
RECOVER {
@Override
public void recover(CopycatClient client) {
client.recover();
}
}
}