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Its an port to fix bugs in OSGi support. ... The Apache Commons Discovery 0.5 component is about discovering, or finding, implementations for pluggable interfaces.

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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.commons.discovery.resource.names;

import org.apache.commons.discovery.ResourceDiscover;
import org.apache.commons.discovery.ResourceNameDiscover;
import org.apache.commons.discovery.resource.ClassLoaders;

/**
 * Provide JDK 1.3 style service discovery...
 *
 * The caller will first configure the discoverer by creating a
 * root Discoverer for the files.
 */
public class DiscoverServiceNames extends DiscoverNamesInFile implements ResourceNameDiscover {

    protected static final String SERVICE_HOME = "META-INF/services/";

    /**
     * Construct a new service discoverer.
     */
    public DiscoverServiceNames() {
        super(SERVICE_HOME, null);
    }

    /**
     * Construct a new resource discoverer.
     *
     * @param prefix The resource name prefix
     * @param suffix The resource name suffix
     */
    public DiscoverServiceNames(String prefix, String suffix) {
        super((prefix == null) ? SERVICE_HOME : SERVICE_HOME + prefix, suffix);
    }

    /**
     * Construct a new resource discoverer.
     *
     * @param loaders The class loaders holder
     */
    public DiscoverServiceNames(ClassLoaders loaders) {
        super(loaders, SERVICE_HOME, null);
    }

    /**
     * Construct a new resource discoverer.
     *
     * @param loaders The class loaders holder
     * @param prefix The resource name prefix
     * @param suffix The resource name suffix
     */
    public DiscoverServiceNames(ClassLoaders loaders, String prefix, String suffix) {
        super(loaders, (prefix == null) ? SERVICE_HOME : SERVICE_HOME + prefix, suffix);
    }

    /**
     * Construct a new service discoverer.
     *
     * @param discoverer The discoverer to resolve resources
     */
    public DiscoverServiceNames(ResourceDiscover discoverer) {
        super(discoverer, SERVICE_HOME, null);
    }

    /**
     * Construct a new service discoverer.
     *
     * @param discoverer The discoverer to resolve resources
     * @param prefix The resource name prefix
     * @param suffix The resource name suffix
     */
    public DiscoverServiceNames(ResourceDiscover discoverer, String prefix, String suffix) {
        super(discoverer, (prefix == null) ? SERVICE_HOME : SERVICE_HOME + prefix, suffix);
    }

}