    001// Copyright 2010, 2011 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007// http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.internal.transform;
    016
    017import org.apache.tapestry5.annotations.HeartbeatDeferred;
    018import org.apache.tapestry5.model.MutableComponentModel;
    019import org.apache.tapestry5.plastic.MethodAdvice;
    020import org.apache.tapestry5.plastic.MethodInvocation;
    021import org.apache.tapestry5.plastic.PlasticClass;
    022import org.apache.tapestry5.plastic.PlasticMethod;
    023import org.apache.tapestry5.services.Heartbeat;
    024import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
    025import org.apache.tapestry5.services.transform.TransformationSupport;
    026
    027public class HeartbeatDeferredWorker implements ComponentClassTransformWorker2
    028{
    029    private final Heartbeat heartbeat;
    030
    031    private final MethodAdvice deferredAdvice = new MethodAdvice()
    032    {
    033        public void advise(final MethodInvocation invocation)
    034        {
    035            heartbeat.defer(new Runnable()
    036            {
    037                public void run()
    038                {
    039                    invocation.proceed();
    040                }
    041            });
    042        }
    043    };
    044
    045    public HeartbeatDeferredWorker(Heartbeat heartbeat)
    046    {
    047        this.heartbeat = heartbeat;
    048    }
    049
    050    public void transform(PlasticClass plasticClass, TransformationSupport support, MutableComponentModel model)
    051    {
    052        for (PlasticMethod method : plasticClass.getMethodsWithAnnotation(HeartbeatDeferred.class))
    053        {
    054            deferMethodInvocations(method);
    055        }
    056    }
    057
    058    void deferMethodInvocations(PlasticMethod method)
    059    {
    060        validateVoid(method);
    061
    062        validateNoCheckedExceptions(method);
    063
    064        method.addAdvice(deferredAdvice);
    065
    066    }
    067
    068    private void validateNoCheckedExceptions(PlasticMethod method)
    069    {
    070        if (method.getDescription().checkedExceptionTypes.length > 0)
    071            throw new RuntimeException(
    072                    String.format(
    073                            "Method %s is not compatible with the @HeartbeatDeferred annotation, as it throws checked exceptions.",
    074                            method.getMethodIdentifier()));
    075    }
    076
    077    private void validateVoid(PlasticMethod method)
    078    {
    079        if (!method.isVoid())
    080            throw new RuntimeException(String.format(
    081                    "Method %s is not compatible with the @HeartbeatDeferred annotation, as it is not a void method.",
    082                    method.getMethodIdentifier()));
    083    }
    084}