/*
* Copyright 2002-2005 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 org.springframework.aop.interceptor;
import java.io.Serializable;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.util.ConcurrencyThrottleSupport;
/**
* Interceptor that throttles concurrent access, blocking invocations
* if a specified concurrency limit is reached.
*
* <p>Can be applied to methods of local services that involve heavy use
* of system resources, in a scenario where it is more efficient to
* throttle concurrency for a specific service rather than restricting
* the entire thread pool (e.g. the web container's thread pool).
*
* <p>The default concurrency limit of this interceptor is 1.
* Specify the "concurrencyLimit" bean property to change this value.
*
* @author Juergen Hoeller
* @since 11.02.2004
* @see #setConcurrencyLimit
*/
public class ConcurrencyThrottleInterceptor extends ConcurrencyThrottleSupport
implements MethodInterceptor, Serializable {
public ConcurrencyThrottleInterceptor() {
setConcurrencyLimit(1);
}
public Object invoke(MethodInvocation methodInvocation) throws Throwable {
beforeAccess();
try {
return methodInvocation.proceed();
}
finally {
afterAccess();
}
}
}
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