diff options
author | dims <dims@13f79535-47bb-0310-9956-ffa450edef68> | 2008-06-17 00:23:01 +0000 |
---|---|---|
committer | dims <dims@13f79535-47bb-0310-9956-ffa450edef68> | 2008-06-17 00:23:01 +0000 |
commit | bdd0a41aed7edf21ec2a65cfa17a86af2ef8c48a (patch) | |
tree | 38a92061c0793434c4be189f1d70c3458b6bc41d /sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/monitor/ProxyMonitorFactory.java |
Move Tuscany from Incubator to top level.
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/monitor/ProxyMonitorFactory.java')
-rw-r--r-- | sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/monitor/ProxyMonitorFactory.java | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/monitor/ProxyMonitorFactory.java b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/monitor/ProxyMonitorFactory.java new file mode 100644 index 0000000000..d9ca9e6cfc --- /dev/null +++ b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/monitor/ProxyMonitorFactory.java @@ -0,0 +1,234 @@ +/* + * 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.tuscany.core.monitor; + +import java.util.Map; +import java.util.Properties; +import java.util.HashMap; +import java.util.ResourceBundle; +import java.util.Locale; +import java.util.MissingResourceException; +import java.util.List; +import java.util.ArrayList; +import java.util.WeakHashMap; +import java.util.logging.Level; +import java.lang.ref.WeakReference; +import java.lang.reflect.Method; +import java.lang.reflect.InvocationHandler; +import java.lang.reflect.Proxy; +import java.io.PrintWriter; +import java.io.StringWriter; + +import org.apache.tuscany.host.MonitorFactory; +import org.apache.tuscany.host.monitor.FormatterRegistry; +import org.apache.tuscany.host.monitor.ExceptionFormatter; +import org.apache.tuscany.api.annotation.LogLevel; + +/** + * @version $Rev$ $Date$ + */ +public abstract class ProxyMonitorFactory implements MonitorFactory, FormatterRegistry { + protected String bundleName; + protected final List<ExceptionFormatter> formatters = new ArrayList<ExceptionFormatter>(); + protected final ExceptionFormatter defaultFormatter = new DefaultExceptionFormatter(); + protected Level defaultLevel; + protected Map<String, Level> levels; + private final Map<Class<?>, WeakReference<?>> proxies = new WeakHashMap<Class<?>, WeakReference<?>>(); + + public void initialize(Map<String, Object> configProperties) { + if (configProperties == null) { + return; + } + initInternal(configProperties); + } + + protected void initInternal(Map<String, Object> configProperties) { + try { + this.defaultLevel = (Level) configProperties.get("defaultLevel"); + this.bundleName = (String) configProperties.get("bundleName"); + Properties levels = (Properties) configProperties.get("levels"); + + this.levels = new HashMap<String, Level>(); + if (levels != null) { + for (Map.Entry<Object, Object> entry : levels.entrySet()) { + 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); + } + } + } + } catch (ClassCastException cce) { + throw new IllegalArgumentException(cce.getLocalizedMessage()); + } + } + + public synchronized <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; + } + + protected <T> T getCachedMonitor(Class<T> monitorInterface) { + WeakReference<?> ref = proxies.get(monitorInterface); + return (ref != null) ? monitorInterface.cast(ref.get()) : null; + } + + protected <T> T createMonitor(Class<T> monitorInterface) { + String className = monitorInterface.getName(); + Method[] methods = monitorInterface.getMethods(); + Map<String, Level> levels = new HashMap<String, Level>(methods.length); + for (Method method : methods) { + String key = className + '#' + method.getName(); + Level level = null; + if (this.levels != null) { + 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) { + level = defaultLevel; + } + levels.put(method.getName(), level); + } + + InvocationHandler handler = createInvocationHandler(monitorInterface, levels); + Object proxy = Proxy.newProxyInstance(monitorInterface.getClassLoader(), + new Class<?>[]{monitorInterface}, + handler); + return monitorInterface.cast(proxy); + } + + protected <T> ResourceBundle locateBundle(Class<T> monitorInterface, String bundleName) { + Locale locale = Locale.getDefault(); + ClassLoader cl = monitorInterface.getClassLoader(); + String packageName = monitorInterface.getPackage().getName(); + while (true) { + try { + return ResourceBundle.getBundle(packageName + '.' + bundleName, locale, cl); + } catch (MissingResourceException e) { + //ok + } + int index = packageName.lastIndexOf('.'); + if (index == -1) { + break; + } + packageName = packageName.substring(0, index); + } + try { + return ResourceBundle.getBundle(bundleName, locale, cl); + } catch (Exception e) { + return null; + } + } + + public void register(ExceptionFormatter formatter) { + formatters.add(formatter); + } + + public void unregister(ExceptionFormatter formatter) { + formatters.remove(formatter); + } + + protected abstract <T> InvocationHandler createInvocationHandler(Class<T> monitorInterface, + Map<String, Level> levels); + + protected String formatException(Throwable e) { + ExceptionFormatter formatter = defaultFormatter; + for (ExceptionFormatter candidate : formatters) { + if (candidate.canFormat(e.getClass())) { + formatter = candidate; + break; + } + } + StringWriter writer = new StringWriter(); + PrintWriter pw = new PrintWriter(writer); + formatter.write(pw, e); + format(pw, e); + pw.close(); + return writer.toString(); + } + + protected void format(PrintWriter writer, Throwable throwable) { + writer.println(throwable.getClass().getName()); + StackTraceElement[] trace = throwable.getStackTrace(); + for (StackTraceElement aTrace : trace) { + writer.println("\tat " + aTrace); + } + Throwable ourCause = throwable.getCause(); + + if (ourCause != null) { + printStackTraceAsCause(writer, ourCause, trace); + } + } + + protected void printStackTraceAsCause(PrintWriter pw, + Throwable throwable, + StackTraceElement[] causedTrace) { + + // Compute number of frames in common between this and caused + StackTraceElement[] trace = throwable.getStackTrace(); + int m = trace.length - 1; + int n = causedTrace.length - 1; + while (m >= 0 && n >= 0 && trace[m].equals(causedTrace[n])) { + m--; + n--; + } + int framesInCommon = trace.length - 1 - m; + + pw.println("Caused by: " + throwable.getClass().getName()); + + ExceptionFormatter formatter = defaultFormatter; + for (ExceptionFormatter candidate : formatters) { + if (candidate.canFormat(throwable.getClass())) { + formatter = candidate; + break; + } + } + formatter.write(pw, throwable); + + for (int i = 0; i <= m; i++) { + pw.println("\tat " + trace[i]); + } + if (framesInCommon != 0) { + pw.println("\t... " + framesInCommon + " more"); + } + + // Recurse if we have a cause + Throwable ourCause = throwable.getCause(); + if (ourCause != null) { + printStackTraceAsCause(pw, ourCause, trace); + } + } +} |