1 files changed, 139 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-stable-20060304/sca/common/src/main/java/org/apache/tuscany/common/monitor/impl/JavaLoggingMonitorFactory.java b/sca-java-1.x/tags/java-stable-20060304/sca/common/src/main/java/org/apache/tuscany/common/monitor/impl/JavaLoggingMonitorFactory.java
new file mode 100644
index 0000000000..06bb87d6dd
--- /dev/null
+++ b/sca-java-1.x/tags/java-stable-20060304/sca/common/src/main/java/org/apache/tuscany/common/monitor/impl/JavaLoggingMonitorFactory.java
@@ -0,0 +1,139 @@
+/**
+ *
+ *  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;
+        }
+    }
+}