org.springframework.web.context.request.async.CallableInterceptorChain Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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
*
* https://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.web.context.request.async;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.context.request.NativeWebRequest;
/**
* Assists with the invocation of {@link CallableProcessingInterceptor}'s.
*
* @author Rossen Stoyanchev
* @author Rob Winch
* @since 3.2
*/
class CallableInterceptorChain {
private static final Log logger = LogFactory.getLog(CallableInterceptorChain.class);
private final List interceptors;
private int preProcessIndex = -1;
private volatile Future taskFuture;
public CallableInterceptorChain(List interceptors) {
this.interceptors = interceptors;
}
public void setTaskFuture(Future taskFuture) {
this.taskFuture = taskFuture;
}
public void applyBeforeConcurrentHandling(NativeWebRequest request, Callable task) throws Exception {
for (CallableProcessingInterceptor interceptor : this.interceptors) {
interceptor.beforeConcurrentHandling(request, task);
}
}
public void applyPreProcess(NativeWebRequest request, Callable task) throws Exception {
for (CallableProcessingInterceptor interceptor : this.interceptors) {
interceptor.preProcess(request, task);
this.preProcessIndex++;
}
}
public Object applyPostProcess(NativeWebRequest request, Callable task, Object concurrentResult) {
Throwable exceptionResult = null;
for (int i = this.preProcessIndex; i >= 0; i--) {
try {
this.interceptors.get(i).postProcess(request, task, concurrentResult);
}
catch (Throwable ex) {
// Save the first exception but invoke all interceptors
if (exceptionResult != null) {
if (logger.isTraceEnabled()) {
logger.trace("Ignoring failure in postProcess method", ex);
}
}
else {
exceptionResult = ex;
}
}
}
return (exceptionResult != null) ? exceptionResult : concurrentResult;
}
public Object triggerAfterTimeout(NativeWebRequest request, Callable task) {
cancelTask();
for (CallableProcessingInterceptor interceptor : this.interceptors) {
try {
Object result = interceptor.handleTimeout(request, task);
if (result == CallableProcessingInterceptor.RESPONSE_HANDLED) {
break;
}
else if (result != CallableProcessingInterceptor.RESULT_NONE) {
return result;
}
}
catch (Throwable ex) {
return ex;
}
}
return CallableProcessingInterceptor.RESULT_NONE;
}
private void cancelTask() {
Future future = this.taskFuture;
if (future != null) {
try {
future.cancel(true);
}
catch (Throwable ex) {
// Ignore
}
}
}
public Object triggerAfterError(NativeWebRequest request, Callable task, Throwable throwable) {
cancelTask();
for (CallableProcessingInterceptor interceptor : this.interceptors) {
try {
Object result = interceptor.handleError(request, task, throwable);
if (result == CallableProcessingInterceptor.RESPONSE_HANDLED) {
break;
}
else if (result != CallableProcessingInterceptor.RESULT_NONE) {
return result;
}
}
catch (Throwable ex) {
return ex;
}
}
return CallableProcessingInterceptor.RESULT_NONE;
}
public void triggerAfterCompletion(NativeWebRequest request, Callable task) {
for (int i = this.interceptors.size()-1; i >= 0; i--) {
try {
this.interceptors.get(i).afterCompletion(request, task);
}
catch (Throwable ex) {
if (logger.isTraceEnabled()) {
logger.trace("Ignoring failure in afterCompletion method", ex);
}
}
}
}
}