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A strong typed high performance Java Template engine with .Net Razor like syntax
/*
* Copyright (C) 2013 The Rythm Engine project
* Gelin Luo
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.rythmengine.internal;
import org.rythmengine.Rythm;
import org.rythmengine.RythmEngine;
import org.rythmengine.conf.RythmConfiguration;
import org.rythmengine.conf.RythmConfigurationKey;
import org.rythmengine.extension.IRenderExceptionHandler;
import org.rythmengine.extension.IRythmListener;
import org.rythmengine.extension.ISourceCodeEnhancer;
import org.rythmengine.internal.compiler.TemplateClass;
import org.rythmengine.logger.ILogger;
import org.rythmengine.logger.Logger;
import org.rythmengine.resource.TemplateResourceManager;
import org.rythmengine.template.ITag;
import org.rythmengine.template.ITemplate;
import org.rythmengine.template.TemplateBase;
import org.rythmengine.utils.F;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Dispatch {@link IEvent events}
*/
public class EventBus implements IEventDispatcher {
protected static final ILogger logger = Logger.get(EventBus.class);
private final RythmEngine engine;
private final ISourceCodeEnhancer sourceCodeEnhancer;
//private final IByteCodeEnhancer byteCodeEnhancer;
private final IRenderExceptionHandler exceptionHandler;
private static class RythmListenerDispatcher implements IRythmListener {
private List listeners = new ArrayList();
@Override
public void onRender(ITemplate template) {
for (IRythmListener l : listeners) {
try {
l.onRender(template);
} catch (RuntimeException e) {
logger.warn(e, "Error executing onRender method on rythm listener: " + l.getClass());
}
}
}
@Override
public void rendered(ITemplate template) {
for (IRythmListener l : listeners) {
try {
l.rendered(template);
} catch (RuntimeException e) {
logger.warn(e, "Error executing rendered method on rythm listener: " + l.getClass());
}
}
}
@Override
public void enterInvokeTemplate(TemplateBase caller) {
for (IRythmListener l : listeners) {
try {
l.enterInvokeTemplate(caller);
} catch (RuntimeException e) {
logger.warn(e, "Error executing enterInvokeTemplate method on rythm listener: " + l.getClass());
}
}
}
@Override
public void exitInvokeTemplate(TemplateBase caller) {
for (IRythmListener l : listeners) {
try {
l.exitInvokeTemplate(caller);
} catch (RuntimeException e) {
logger.warn(e, "Error executing exitInvokeTemplate method on rythm listener: " + l.getClass());
}
}
}
@Override
public void onInvoke(ITag tag) {
for (IRythmListener l : listeners) {
try {
l.onInvoke(tag);
} catch (RuntimeException e) {
logger.warn(e, "Error executing onInvoke method on rythm listener: " + l.getClass());
}
}
}
@Override
public void invoked(ITag tag) {
for (IRythmListener l : listeners) {
try {
l.invoked(tag);
} catch (RuntimeException e) {
logger.warn(e, "Error executing invoked method on rythm listener: " + l.getClass());
}
}
}
}
private final RythmListenerDispatcher renderListener = new RythmListenerDispatcher();
public final void registerRenderListener(IRythmListener l) {
renderListener.listeners.add(l);
}
public final void unregisterRenderListener(IRythmListener l) {
renderListener.listeners.remove(l);
}
public EventBus(RythmEngine engine) {
this.engine = engine;
RythmConfiguration conf = engine.conf();
sourceCodeEnhancer = conf.get(RythmConfigurationKey.CODEGEN_SOURCE_CODE_ENHANCER);
//byteCodeEnhancer = conf.get(RythmConfigurationKey.CODEGEN_BYTE_CODE_ENHANCER);
exceptionHandler = conf.get(RythmConfigurationKey.RENDER_EXCEPTION_HANDLER);
IRythmListener l = conf.get(RythmConfigurationKey.RENDER_LISTENER);
if (null != l) {
registerRenderListener(l);
}
registerHandlers();
}
private static interface IEventHandler {
RETURN handleEvent(RythmEngine engine, PARAM param);
}
private Map, IEventHandler> dispatcher = new HashMap, IEventHandler>();
@Override
public Object accept(IEvent event, Object param) {
IEventHandler handler = dispatcher.get(event);
if (null != handler) {
return handler.handleEvent(engine, param);
}
return null;
}
private void registerHandlers() {
Map, IEventHandler> m = dispatcher;
m.put(RythmEvents.ON_PARSE, new IEventHandler() {
@Override
public String handleEvent(RythmEngine engine, CodeBuilder c) {
// pre process template source
String tmpl = c.template();
tmpl = tmpl.replaceAll("(\\r\\n)", "\n");
tmpl = tmpl.replaceAll("\\r", "\n");
return tmpl;
}
});
m.put(RythmEvents.PARSE_FAILED, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, TemplateClass tc) {
TemplateResourceManager.rollbackTmpBlackList();
return null;
}
});
m.put(RythmEvents.ON_BUILD_JAVA_SOURCE, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, CodeBuilder cb) {
ISourceCodeEnhancer ce = sourceCodeEnhancer;
if (null == ce) return null;
if (cb.basicTemplate()) {
// basic template do not have common codes
return null;
}
// add common render args
Map defArgs = ce.getRenderArgDescriptions();
for (String name : defArgs.keySet()) {
Object o = defArgs.get(name);
String type = (o instanceof Class) ? ((Class) o).getName() : o.toString();
cb.addRenderArgs(-1, type, name);
}
// add common imports
for (String s : ce.imports()) {
cb.addImport(s, -1);
}
return null;
}
});
m.put(RythmEvents.COMPILED, new IEventHandler() {
@Override
public byte[] handleEvent(RythmEngine engine, byte[] bytes) {
TemplateResourceManager.commitTmpBlackList();
return bytes;
}
});
m.put(RythmEvents.COMPILE_FAILED, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, TemplateClass tc) {
TemplateResourceManager.rollbackTmpBlackList();
return null;
}
});
m.put(RythmEvents.ON_CLOSING_JAVA_CLASS, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, CodeBuilder cb) {
// add common source code
ISourceCodeEnhancer ce = sourceCodeEnhancer;
if (null == ce) {
return null;
}
if (cb.basicTemplate()) {
// basic template do not have common codes
return null;
}
cb.np(ce.sourceCode());
cb.pn();
return null;
}
});
m.put(RythmEvents.ON_RENDER, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, ITemplate template) {
ISourceCodeEnhancer ce = engine.conf().sourceEnhancer();
if (null != ce) {
ce.setRenderArgs(template);
}
renderListener.onRender(template);
return null;
}
});
m.put(RythmEvents.RENDERED, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, ITemplate template) {
engine.renderSettings.clear();
Rythm.RenderTime.clear();
renderListener.rendered(template);
return null;
}
});
m.put(RythmEvents.ON_TAG_INVOCATION, new IEventHandler>() {
@Override
public Void handleEvent(RythmEngine engine, F.T2 param) {
renderListener.onInvoke(param._2);
return null;
}
});
m.put(RythmEvents.TAG_INVOKED, new IEventHandler>() {
@Override
public Void handleEvent(RythmEngine engine, F.T2 param) {
renderListener.invoked(param._2);
return null;
}
});
m.put(RythmEvents.ENTER_INVOKE_TEMPLATE, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, TemplateBase caller) {
renderListener.enterInvokeTemplate(caller);
return null;
}
});
m.put(RythmEvents.EXIT_INVOKE_TEMPLATE, new IEventHandler() {
@Override
public Void handleEvent(RythmEngine engine, TemplateBase caller) {
renderListener.exitInvokeTemplate(caller);
return null;
}
});
m.put(RythmEvents.ON_RENDER_EXCEPTION, new IEventHandler>() {
@Override
public Boolean handleEvent(RythmEngine engine, F.T2 param) {
if (null == exceptionHandler) return false;
return exceptionHandler.handleTemplateExecutionException(param._2, param._1);
}
});
}
}
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