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Phoenix Client

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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.tephra.coprocessor;

import com.google.common.base.Supplier;
import com.google.common.util.concurrent.Service;

/**
 * Provides ability to get and release objects
 *
 * @param  type of the object supplied
 */
public interface CacheSupplier extends Supplier {

  /**
   * @return Get an instance of T and if it is the first call, then the service will be started. Subsequent calls
   * will get a reference to the same instance
   */
  @Override
  T get();

  /**
   * Release the object obtained through {code Supplier#get()}. If this is the last release call, then the service will
   * be stopped.
   */
  void release();
}