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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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.apache.tuscany.common.monitor.impl;
import java.lang.ref.WeakReference;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.WeakHashMap;
import java.util.Map;
import java.util.HashMap;
import java.util.Properties;
import java.util.Iterator;
import java.util.logging.Logger;
import java.util.logging.Level;
import org.apache.tuscany.common.monitor.MonitorFactory;
import org.apache.tuscany.common.monitor.LogLevel;
/**
* A factory for monitors that forwards events to a {@link java.util.logging.Logger Java Logging (JSR47) Logger}.
*
* @version $Rev$ $Date$
*/
public class JavaLoggingMonitorFactory implements MonitorFactory {
private final String bundleName;
private final Level defaultLevel;
private final Map<String, Level> levels;
private final Map<Class<?>, WeakReference<?>> proxies = new WeakHashMap();
/**
*
* @param levels
* @param defaultLevel
* @param bundleName
*/
public JavaLoggingMonitorFactory(Properties levels, Level defaultLevel, String bundleName) {
this.defaultLevel = defaultLevel;
this.bundleName = bundleName;
this.levels = new HashMap(levels.size());
for (Iterator<Map.Entry<Object, Object>> i = levels.entrySet().iterator(); i.hasNext();) {
Map.Entry<Object, Object> entry = i.next();
String method = (String) entry.getKey();
String level = (String) entry.getValue();
try {
this.levels.put(method, Level.parse(level));
} catch (IllegalArgumentException e) {
throw new InvalidLevelException(method, level);
}
}
}
public synchronized <T> T getMonitor(Class<T> monitorInterface) {
T proxy = getCachedMonitor(monitorInterface);
if (proxy == null) {
proxy = createMonitor(monitorInterface);
proxies.put(monitorInterface, new WeakReference(proxy));
}
return proxy;
}
private <T>T getCachedMonitor(Class<T> monitorInterface) {
WeakReference<T> ref = (WeakReference<T>) proxies.get(monitorInterface);
return (ref != null) ? ref.get() : null;
}
private <T>T createMonitor(Class<T> monitorInterface) {
String className = monitorInterface.getName();
Logger logger = Logger.getLogger(className, bundleName);
Method[] methods = monitorInterface.getMethods();
Map<String, Level> levels = new HashMap(methods.length);
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
String key = className + '#' + method.getName();
Level level = this.levels.get(key);
// if not specified the in config properties, look for an annotation on the method
if (level == null) {
LogLevel annotation = method.getAnnotation(LogLevel.class);
if (annotation != null && annotation.value() != null) {
try {
level = Level.parse(annotation.value());
} catch (IllegalArgumentException e) {
// bad value, just use the default
level = defaultLevel;
}
}
}
if (level != null) {
levels.put(method.getName(), level);
}
}
InvocationHandler handler = new LoggingHandler(logger, levels);
return (T) Proxy.newProxyInstance(monitorInterface.getClassLoader(), new Class<?>[]{monitorInterface}, handler);
}
private static final class LoggingHandler implements InvocationHandler {
private final Logger logger;
private final Map<String, Level> methodLevels;
public LoggingHandler(Logger logger, Map<String, Level> methodLevels) {
this.logger = logger;
this.methodLevels = methodLevels;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
String sourceMethod = method.getName();
Level level = methodLevels.get(sourceMethod);
if (level != null && logger.isLoggable(level)) {
// construct the key for the resource bundle
String className = logger.getName();
String key = className + '#' + sourceMethod;
// if the only argument is a Throwable use the special logger for it
if (args != null && args.length == 1 && args[0] instanceof Throwable) {
logger.logp(level, className, sourceMethod, key, (Throwable) args[0]);
} else {
logger.logp(level, className, sourceMethod, key, args);
}
}
return null;
}
}
}
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