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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.webbeans.spi;

/**
 * 
 * Responsible for providing singleton instances
 * for OWB runtime. Provider can implement
 * their own logic to provide singleton instances.
 * 
 * @version $Rev$ $Date$
 */
public interface SingletonService
{
    /**
     * Get instance for given key and class name.
     * @param key instance key
     * @return instance
     */
    public T get(Object key);
    
    /**
     * Any clean activity.
     * @param key instance key
     */
    public void clear(Object key);
    
}