Example usage for org.springframework.batch.core.listener ListenerMetaData getListenerInterface

Introduction

In this page you can find the example usage for org.springframework.batch.core.listener ListenerMetaData getListenerInterface.

Prototype

public Class<?> getListenerInterface();

Source Link

Usage

From source file:org.springframework.batch.core.listener.AbstractListenerFactoryBean.java

@Override
public Object getObject() {
    if (metaDataMap == null) {
        metaDataMap = new HashMap<String, String>();
    }//w  w w. j  ava 2 s .  c o  m
    // Because all annotations and interfaces should be checked for, make
    // sure that each meta data
    // entry is represented.
    for (ListenerMetaData metaData : this.getMetaDataValues()) {
        if (!metaDataMap.containsKey(metaData.getPropertyName())) {
            // put null so that the annotation and interface is checked
            metaDataMap.put(metaData.getPropertyName(), null);
        }
    }

    Set<Class<?>> listenerInterfaces = new HashSet<Class<?>>();

    // For every entry in the map, try and find a method by interface, name,
    // or annotation. If the same
    Map<String, Set<MethodInvoker>> invokerMap = new HashMap<String, Set<MethodInvoker>>();
    boolean synthetic = false;
    for (Entry<String, String> entry : metaDataMap.entrySet()) {
        final ListenerMetaData metaData = this.getMetaDataFromPropertyName(entry.getKey());
        Set<MethodInvoker> invokers = new HashSet<MethodInvoker>();

        MethodInvoker invoker;
        invoker = getMethodInvokerForInterface(metaData.getListenerInterface(), metaData.getMethodName(),
                delegate, metaData.getParamTypes());
        if (invoker != null) {
            invokers.add(invoker);
        }

        invoker = getMethodInvokerByName(entry.getValue(), delegate, metaData.getParamTypes());
        if (invoker != null) {
            invokers.add(invoker);
            synthetic = true;
        }

        if (metaData.getAnnotation() != null) {
            invoker = getMethodInvokerByAnnotation(metaData.getAnnotation(), delegate,
                    metaData.getParamTypes());
            if (invoker != null) {
                invokers.add(invoker);
                synthetic = true;
            }
        }

        if (!invokers.isEmpty()) {
            invokerMap.put(metaData.getMethodName(), invokers);
            listenerInterfaces.add(metaData.getListenerInterface());
        }

    }

    if (listenerInterfaces.isEmpty()) {
        listenerInterfaces.add(this.getDefaultListenerClass());
    }

    if (!synthetic) {
        int count = 0;
        for (Class<?> listenerInterface : listenerInterfaces) {
            if (listenerInterface.isInstance(delegate)) {
                count++;
            }
        }
        // All listeners can be supplied by the delegate itself
        if (count == listenerInterfaces.size()) {
            return delegate;
        }
    }

    boolean ordered = false;
    if (delegate instanceof Ordered) {
        ordered = true;
        listenerInterfaces.add(Ordered.class);
    }

    // create a proxy listener for only the interfaces that have methods to
    // be called
    ProxyFactory proxyFactory = new ProxyFactory();
    if (delegate instanceof Advised) {
        proxyFactory.setTargetSource(((Advised) delegate).getTargetSource());
    } else {
        proxyFactory.setTarget(delegate);
    }
    proxyFactory.setInterfaces(listenerInterfaces.toArray(new Class[0]));
    proxyFactory
            .addAdvisor(new DefaultPointcutAdvisor(new MethodInvokerMethodInterceptor(invokerMap, ordered)));
    return proxyFactory.getProxy();

}

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