org.springframework.web.context.request.async.DeferredResultInterceptorChain 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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.context.request.NativeWebRequest;
/**
* Assists with the invocation of {@link DeferredResultProcessingInterceptor}'s.
*
* @author Rossen Stoyanchev
* @since 3.2
*/
class DeferredResultInterceptorChain {
private static final Log logger = LogFactory.getLog(DeferredResultInterceptorChain.class);
private final List interceptors;
private int preProcessingIndex = -1;
public DeferredResultInterceptorChain(List interceptors) {
this.interceptors = interceptors;
}
public void applyBeforeConcurrentHandling(NativeWebRequest request, DeferredResult deferredResult)
throws Exception {
for (DeferredResultProcessingInterceptor interceptor : this.interceptors) {
interceptor.beforeConcurrentHandling(request, deferredResult);
}
}
public void applyPreProcess(NativeWebRequest request, DeferredResult deferredResult) throws Exception {
for (DeferredResultProcessingInterceptor interceptor : this.interceptors) {
interceptor.preProcess(request, deferredResult);
this.preProcessingIndex++;
}
}
public Object applyPostProcess(NativeWebRequest request, DeferredResult deferredResult,
Object concurrentResult) {
try {
for (int i = this.preProcessingIndex; i >= 0; i--) {
this.interceptors.get(i).postProcess(request, deferredResult, concurrentResult);
}
}
catch (Throwable ex) {
return ex;
}
return concurrentResult;
}
public void triggerAfterTimeout(NativeWebRequest request, DeferredResult deferredResult) throws Exception {
for (DeferredResultProcessingInterceptor interceptor : this.interceptors) {
if (deferredResult.isSetOrExpired()) {
return;
}
if (!interceptor.handleTimeout(request, deferredResult)){
break;
}
}
}
/**
* Determine if further error handling should be bypassed.
* @return {@code true} to continue error handling, or false to bypass any further
* error handling
*/
public boolean triggerAfterError(NativeWebRequest request, DeferredResult deferredResult, Throwable ex)
throws Exception {
for (DeferredResultProcessingInterceptor interceptor : this.interceptors) {
if (deferredResult.isSetOrExpired()) {
return false;
}
if (!interceptor.handleError(request, deferredResult, ex)){
return false;
}
}
return true;
}
public void triggerAfterCompletion(NativeWebRequest request, DeferredResult deferredResult) {
for (int i = this.preProcessingIndex; i >= 0; i--) {
try {
this.interceptors.get(i).afterCompletion(request, deferredResult);
}
catch (Throwable ex) {
logger.trace("Ignoring failure in afterCompletion method", ex);
}
}
}
}