| 1 | /* |
| 2 | * Copyright 2002-2008 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.springframework.batch.core.listener; |
| 17 | |
| 18 | import java.util.Map; |
| 19 | import java.util.Set; |
| 20 | |
| 21 | import org.aopalliance.intercept.MethodInterceptor; |
| 22 | import org.aopalliance.intercept.MethodInvocation; |
| 23 | import org.springframework.batch.core.ExitStatus; |
| 24 | import org.springframework.batch.core.StepExecutionListener; |
| 25 | import org.springframework.batch.support.MethodInvoker; |
| 26 | |
| 27 | /** |
| 28 | * {@link MethodInterceptor} that, given a map of method names and |
| 29 | * {@link MethodInvoker}s, will execute all methods tied to a particular method |
| 30 | * name, with the provided arguments. The only possible return value that is |
| 31 | * handled is of type ExitStatus, since the only StepListener implementation |
| 32 | * that isn't void is |
| 33 | * {@link StepExecutionListener#afterStep(org.springframework.batch.core.StepExecution)} |
| 34 | * , which returns ExitStatus. |
| 35 | * |
| 36 | * @author Lucas Ward |
| 37 | * @since 2.0 |
| 38 | * @see MethodInvoker |
| 39 | */ |
| 40 | public class MethodInvokerMethodInterceptor implements MethodInterceptor { |
| 41 | |
| 42 | private final Map<String, Set<MethodInvoker>> invokerMap; |
| 43 | private final boolean ordered; |
| 44 | |
| 45 | public MethodInvokerMethodInterceptor(Map<String, Set<MethodInvoker>> invokerMap) { |
| 46 | this(invokerMap, false); |
| 47 | } |
| 48 | |
| 49 | public MethodInvokerMethodInterceptor(Map<String, Set<MethodInvoker>> invokerMap, boolean ordered) { |
| 50 | this.ordered = ordered; |
| 51 | this.invokerMap = invokerMap; |
| 52 | } |
| 53 | |
| 54 | public Object invoke(MethodInvocation invocation) throws Throwable { |
| 55 | |
| 56 | String methodName = invocation.getMethod().getName(); |
| 57 | if (ordered && methodName.equals("getOrder")) { |
| 58 | return invocation.proceed(); |
| 59 | } |
| 60 | |
| 61 | Set<MethodInvoker> invokers = invokerMap.get(methodName); |
| 62 | |
| 63 | if (invokers == null) { |
| 64 | return null; |
| 65 | } |
| 66 | ExitStatus status = null; |
| 67 | for (MethodInvoker invoker : invokers) { |
| 68 | Object retVal = invoker.invokeMethod(invocation.getArguments()); |
| 69 | if (retVal instanceof ExitStatus) { |
| 70 | if (status != null) { |
| 71 | status = status.and((ExitStatus) retVal); |
| 72 | } |
| 73 | else { |
| 74 | status = (ExitStatus) retVal; |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | // The only possible return values are ExitStatus or int (from Ordered) |
| 80 | return status; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * {@inheritDoc} |
| 85 | */ |
| 86 | @Override |
| 87 | public boolean equals(Object obj) { |
| 88 | if (!(obj instanceof MethodInvokerMethodInterceptor)) { |
| 89 | return false; |
| 90 | } |
| 91 | MethodInvokerMethodInterceptor other = (MethodInvokerMethodInterceptor) obj; |
| 92 | return invokerMap.equals(other.invokerMap); |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * {@inheritDoc} |
| 97 | */ |
| 98 | @Override |
| 99 | public int hashCode() { |
| 100 | return invokerMap.hashCode(); |
| 101 | } |
| 102 | |
| 103 | } |