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/*
* 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.apache.servicemix.sca.tuscany;
import java.lang.ref.WeakReference;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Map;
import java.util.WeakHashMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tuscany.common.monitor.MonitorFactory;
public class CommonsLoggingMonitorFactory implements MonitorFactory {
private final Map<Class<?>, WeakReference<?>> proxies = new WeakHashMap<Class<?>, WeakReference<?>>();
public CommonsLoggingMonitorFactory() {
}
public <T> T getMonitor(Class<T> monitorInterface) {
T proxy = getCachedMonitor(monitorInterface);
if (proxy == null) {
proxy = createMonitor(monitorInterface);
proxies.put(monitorInterface, new WeakReference<T>(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();
Log logger = LogFactory.getLog(className);
InvocationHandler handler = new LoggingHandler(logger);
return (T) Proxy.newProxyInstance(monitorInterface.getClassLoader(), new Class<?>[]{monitorInterface}, handler);
}
private static final class LoggingHandler implements InvocationHandler {
private final Log logger;
public LoggingHandler(Log logger) {
this.logger = logger;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
String sourceMethod = method.getName();
if (logger.isDebugEnabled()) {
// if the only argument is a Throwable use the special logger for it
if (args != null && args.length == 1 && args[0] instanceof Throwable) {
logger.debug(sourceMethod, (Throwable) args[0]);
} else {
StringBuilder sb = new StringBuilder();
sb.append(sourceMethod);
sb.append("(");
for (int i = 0; i < args.length; i++) {
if (i > 0) {
sb.append(", ");
}
sb.append(args[i]);
}
sb.append(")");
logger.debug(sb.toString());
}
}
return null;
}
}
}
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