org.primefaces.component.cache.UICacheRenderer Maven / Gradle / Ivy
/*
* Copyright 2009-2014 PrimeTek.
*
* 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.primefaces.component.cache;
import java.io.IOException;
import java.io.StringWriter;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.primefaces.cache.CacheProvider;
import org.primefaces.context.RequestContext;
import org.primefaces.renderkit.CoreRenderer;
public class UICacheRenderer extends CoreRenderer {
@Override
public void encodeChildren(FacesContext context, UIComponent component) throws IOException {
UICache uiCache = (UICache) component;
if(!uiCache.isDisabled()) {
ResponseWriter writer = context.getResponseWriter();
CacheProvider cacheProvider = RequestContext.getCurrentInstance().getApplicationContext().getCacheProvider();
String key = uiCache.getKey();
String region = uiCache.getRegion();
if(key == null) {
key = uiCache.getClientId(context);
}
if(region == null) {
region = context.getViewRoot().getViewId();
}
String output = (String) cacheProvider.get(region, key);
if(output == null) {
StringWriter stringWriter = new StringWriter();
ResponseWriter clonedWriter = writer.cloneWithWriter(stringWriter);
context.setResponseWriter(clonedWriter);
renderChildren(context, uiCache);
output = stringWriter.getBuffer().toString();
cacheProvider.put(region, key, output);
context.setResponseWriter(writer);
uiCache.setCacheSetInCurrentRequest(true);
}
writer.write(output);
}
else {
renderChildren(context, uiCache);
}
}
@Override
public boolean getRendersChildren() {
return true;
}
}