/*
* Copyright 2002-2013 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.batch.core.listener;
import java.util.Map;
import java.util.Set;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.StepExecutionListener;
import org.springframework.batch.support.MethodInvoker;
/**
* {@link MethodInterceptor} that, given a map of method names and
* {@link MethodInvoker}s, will execute all methods tied to a particular method
* name, with the provided arguments. The only possible return value that is
* handled is of type ExitStatus, since the only StepListener implementation
* that isn't void is
* {@link StepExecutionListener#afterStep(org.springframework.batch.core.StepExecution)}
* , which returns ExitStatus.
*
* @author Lucas Ward
* @since 2.0
* @see MethodInvoker
*/
public class MethodInvokerMethodInterceptor implements MethodInterceptor {
private final Map<String, Set<MethodInvoker>> invokerMap;
private final boolean ordered;
public MethodInvokerMethodInterceptor(Map<String, Set<MethodInvoker>> invokerMap) {
this(invokerMap, false);
}
public MethodInvokerMethodInterceptor(Map<String, Set<MethodInvoker>> invokerMap, boolean ordered) {
this.ordered = ordered;
this.invokerMap = invokerMap;
}
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
String methodName = invocation.getMethod().getName();
if (ordered && methodName.equals("getOrder")) {
return invocation.proceed();
}
Set<MethodInvoker> invokers = invokerMap.get(methodName);
if (invokers == null) {
return null;
}
ExitStatus status = null;
for (MethodInvoker invoker : invokers) {
Object retVal = invoker.invokeMethod(invocation.getArguments());
if (retVal instanceof ExitStatus) {
if (status != null) {
status = status.and((ExitStatus) retVal);
}
else {
status = (ExitStatus) retVal;
}
}
}
// The only possible return values are ExitStatus or int (from Ordered)
return status;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof MethodInvokerMethodInterceptor)) {
return false;
}
MethodInvokerMethodInterceptor other = (MethodInvokerMethodInterceptor) obj;
return invokerMap.equals(other.invokerMap);
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return invokerMap.hashCode();
}
}