org.jclouds.logging.LoggingModules.java Source code

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Here is the source code for org.jclouds.logging.LoggingModules.java

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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.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();
        }
    }
}