/**
* Copyright 2010-2013 Ralph Schaer <ralphschaer@gmail.com>
*
* 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 ch.ralscha.extdirectspring.controller;
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.util.WebUtils;
import ch.ralscha.extdirectspring.bean.SSEvent;
import ch.ralscha.extdirectspring.util.ExtDirectSpringUtil;
import ch.ralscha.extdirectspring.util.MethodInfo;
import ch.ralscha.extdirectspring.util.MethodInfoCache;
@Service
public class SSEHandler {
private static final Log log = LogFactory.getLog(SSEHandler.class);
@Autowired
private ConfigurationService configurationService;
public void handle(String beanName, String method, HttpServletRequest request, HttpServletResponse response,
Locale locale) throws Exception {
MethodInfo methodInfo = MethodInfoCache.INSTANCE.get(beanName, method);
SSEvent result = null;
SSEWriter sseWriter = new SSEWriter(response);
if (methodInfo != null) {
try {
Object[] parameters = configurationService.getParametersResolver().prepareParameters(request, response,
locale, methodInfo, sseWriter);
Object methodReturnValue;
if (configurationService.getConfiguration().isSynchronizeOnSession()
|| methodInfo.isSynchronizeOnSession()) {
HttpSession session = request.getSession(false);
if (session != null) {
Object mutex = WebUtils.getSessionMutex(session);
synchronized (mutex) {
methodReturnValue = ExtDirectSpringUtil.invoke(
configurationService.getApplicationContext(), beanName, methodInfo, parameters);
}
} else {
methodReturnValue = ExtDirectSpringUtil.invoke(configurationService.getApplicationContext(),
beanName, methodInfo, parameters);
}
} else {
methodReturnValue = ExtDirectSpringUtil.invoke(configurationService.getApplicationContext(),
beanName, methodInfo, parameters);
}
if (methodReturnValue instanceof SSEvent) {
result = (SSEvent) methodReturnValue;
} else if (methodReturnValue != null) {
result = new SSEvent();
result.setData(methodReturnValue.toString());
}
} catch (Exception e) {
log.error("Error polling method '" + beanName + "." + method + "'", e.getCause() != null ? e.getCause()
: e);
Throwable cause;
if (e.getCause() != null) {
cause = e.getCause();
} else {
cause = e;
}
result = new SSEvent();
result.setEvent("error");
result.setData(configurationService.getConfiguration().getMessage(cause));
if (configurationService.getConfiguration().isSendStacktrace()) {
result.setComment(ExtDirectSpringUtil.getStackTrace(cause));
}
}
} else {
log.error("Error invoking method '" + beanName + "." + method + "'. Method or Bean not found");
result = new SSEvent();
result.setEvent("error");
result.setData(configurationService.getConfiguration().getDefaultExceptionMessage());
if (configurationService.getConfiguration().isSendStacktrace()) {
result.setComment("Bean or Method '" + beanName + "." + method + "' not found");
}
}
if (result != null) {
sseWriter.write(result);
}
}
}