Issue 141: add serviceloader lookup for LoggingModule

core/src/main/java/org/jclouds/logging/LoggingModules.java

@@ -0,0 +1,67 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.jclouds.logging;
+
+import static com.google.common.collect.Iterables.find;
+
+import java.util.NoSuchElementException;
+import java.util.ServiceLoader;
+
+import org.jclouds.logging.config.LoggingModule;
+import org.jclouds.logging.jdk.config.JDKLoggingModule;
+
+import com.google.common.base.Predicates;
+
+/**
+ * The LoggingModules class provides static methods for accessing
+ * loggingModules.
+ * 
+ * @author Adrian Cole
+ */
+public class LoggingModules {
+
+   /**
+    * Returns the {@link LoggingModule}s located on the classpath via
+    * {@link java.util.ServiceLoader}.
+    * 
+    */
+   private static Iterable<LoggingModule> fromServiceLoader() {
+      return ServiceLoader.load(LoggingModule.class);
+   }
+
+   /**
+    * all available {@link LoggingModule}s
+    */
+   public static Iterable<LoggingModule> all() {
+      return fromServiceLoader();
+   }
+
+   /**
+    * the first available {@link LoggingModule}s from
+    * {@link java.util.ServiceLoader} or {@link JDKLoggingModule}
+    */
+   public static LoggingModule firstOrJDKLoggingModule() {
+      try {
+         return find(ServiceLoader.load(LoggingModule.class),
+               Predicates.not(Predicates.instanceOf(JDKLoggingModule.class)));
+      } catch (NoSuchElementException e) {
+         return new JDKLoggingModule();
+      }
+   }
+}

core/src/main/resources/META-INF/services/org.jclouds.logging.config.LoggingModule

@@ -0,0 +1 @@
+org.jclouds.logging.jdk.config.JDKLoggingModule

drivers/log4j/src/main/resources/META-INF/services/org.jclouds.logging.config.LoggingModule

@@ -0,0 +1 @@
+org.jclouds.logging.log4j.config.Log4JLoggingModule

drivers/slf4j/src/main/resources/META-INF/services/org.jclouds.logging.config.LoggingModule

@@ -0,0 +1 @@
+org.jclouds.logging.slf4j.config.SLF4JLoggingModule