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/*
 * 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.commons.lang3.concurrent;

/**
 * 

* An interface describing a Circuit Breaker component. *

*

* A circuit breaker can be used to protect an application against unreliable * services or unexpected load. It typically monitors a specific resource. As long as this * resource works as expected, it stays in state closed, meaning that the * resource can be used. If problems are encountered when using the resource, the circuit * breaker can switch into state open; then access to this resource is * prohibited. Depending on a concrete implementation, it is possible that the circuit * breaker switches back to state closed when the resource becomes available * again. *

*

* This interface defines a generic protocol of a circuit breaker component. It should be * sufficiently generic to be applied to multiple different use cases. *

* * @param the type of the value monitored by this circuit breaker * @since 3.5 */ public interface CircuitBreaker { /** * Returns the current open state of this circuit breaker. A return value of * true means that the circuit breaker is currently open indicating a * problem in the monitored sub system. * * @return the current open state of this circuit breaker */ boolean isOpen(); /** * Returns the current closed state of this circuit breaker. A return value of * true means that the circuit breaker is currently closed. This * means that everything is okay with the monitored sub system. * * @return the current closed state of this circuit breaker */ boolean isClosed(); /** * Checks the state of this circuit breaker and changes it if necessary. The return * value indicates whether the circuit breaker is now in state {@code CLOSED}; a value * of true typically means that the current operation can continue. * * @return true if the circuit breaker is now closed; * false otherwise */ boolean checkState(); /** * Closes this circuit breaker. Its state is changed to closed. If this circuit * breaker is already closed, this method has no effect. */ void close(); /** * Opens this circuit breaker. Its state is changed to open. Depending on a concrete * implementation, it may close itself again if the monitored sub system becomes * available. If this circuit breaker is already open, this method has no effect. */ void open(); /** * Increments the monitored value and performs a check of the current state of this * circuit breaker. This method works like {@link #checkState()}, but the monitored * value is incremented before the state check is performed. * * @param increment value to increment in the monitored value of the circuit breaker * @return true if the circuit breaker is now closed; * false otherwise */ boolean incrementAndCheckState(T increment); }




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