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GrailsAsyncContext.groovy
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GrailsAsyncContext.groovy
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/*
* Copyright 2011 SpringSource
*
* 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.codehaus.groovy.grails.plugins.web.async
import groovy.transform.CompileStatic
import javax.servlet.AsyncContext
import javax.servlet.AsyncListener
import org.codehaus.groovy.grails.support.PersistenceContextInterceptor
import org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest
import org.codehaus.groovy.grails.web.sitemesh.GrailsContentBufferingResponse
import org.codehaus.groovy.grails.web.sitemesh.GroovyPageLayoutFinder
import org.codehaus.groovy.grails.web.util.WebUtils
import com.opensymphony.sitemesh.webapp.SiteMeshWebAppContext
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse
/**
* Wraps an AsyncContext providing additional logic to provide the appropriate context to a Grails application.
*
* @author Graeme Rocher
* @since 2.0
*/
class GrailsAsyncContext implements AsyncContext {
private static final String PERSISTENCE_INTERCEPTORS = 'org.codehaus.groovy.grails.PERSISTENCE_INTERCEPTORS'
@Delegate AsyncContext delegate
GrailsWebRequest originalWebRequest
GroovyPageLayoutFinder groovyPageLayoutFinder
GrailsAsyncContext(AsyncContext delegate, GrailsWebRequest webRequest) {
this.delegate = delegate
originalWebRequest = webRequest
def applicationContext = webRequest.getApplicationContext()
if (applicationContext && applicationContext.containsBean("groovyPageLayoutFinder")) {
groovyPageLayoutFinder = applicationContext.getBean("groovyPageLayoutFinder", GroovyPageLayoutFinder)
}
}
def <T extends AsyncListener> T createListener(Class<T> tClass) {
delegate.createListener(tClass)
}
void start(Runnable runnable) {
delegate.start {
GrailsWebRequest webRequest = new GrailsWebRequest((HttpServletRequest)request, (HttpServletResponse)response, request.getServletContext())
WebUtils.storeGrailsWebRequest(webRequest)
def interceptors = getPersistenceInterceptors(webRequest)
for (PersistenceContextInterceptor i in interceptors) {
i.init()
}
try {
runnable.run()
} finally {
for (PersistenceContextInterceptor i in interceptors) {
i.destroy()
}
webRequest.requestCompleted()
WebUtils.clearGrailsWebRequest()
}
}
}
void complete() {
if (response instanceof GrailsContentBufferingResponse) {
GrailsContentBufferingResponse bufferingResponse = (GrailsContentBufferingResponse) response
def targetResponse = bufferingResponse.getTargetResponse()
def content = bufferingResponse.getContent()
final httpRequest = (HttpServletRequest) request
if (content != null && groovyPageLayoutFinder != null) {
com.opensymphony.sitemesh.Decorator decorator = (com.opensymphony.sitemesh.Decorator)groovyPageLayoutFinder?.findLayout(httpRequest, content)
if (decorator) {
decorator.render content,
new SiteMeshWebAppContext(httpRequest, targetResponse, request.servletContext)
} else {
content.writeOriginal(targetResponse.getWriter())
}
}
}
delegate.complete()
}
protected Collection<PersistenceContextInterceptor> getPersistenceInterceptors(GrailsWebRequest webRequest) {
def servletContext = webRequest.servletContext
Collection<PersistenceContextInterceptor> interceptors = (Collection<PersistenceContextInterceptor>)servletContext?.getAttribute(PERSISTENCE_INTERCEPTORS)
if (interceptors == null) {
interceptors = webRequest.applicationContext?.getBeansOfType(PersistenceContextInterceptor)?.values() ?: []
servletContext.setAttribute(PERSISTENCE_INTERCEPTORS, interceptors)
}
return interceptors
}
}