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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.elasticsearch.common.thread;

/**
 * Overrides the thread name proposed by {@link ThreadRenamingRunnable}.
 *
 * @author kimchy (shay.banon)
 */
public interface ThreadNameDeterminer {

    /**
     * {@link ThreadNameDeterminer} that accepts the proposed thread name
     * as is.
     */
    ThreadNameDeterminer PROPOSED = new ThreadNameDeterminer() {
        public String determineThreadName(String currentThreadName,
                                          String proposedThreadName) throws Exception {
            return proposedThreadName;
        }
    };

    /**
     * {@link ThreadNameDeterminer} that rejects the proposed thread name and
     * retains the current one.
     */
    ThreadNameDeterminer CURRENT = new ThreadNameDeterminer() {
        public String determineThreadName(String currentThreadName,
                                          String proposedThreadName) throws Exception {
            return null;
        }
    };

    /**
     * Overrides the thread name proposed by {@link ThreadRenamingRunnable}.
     *
     * @param currentThreadName  the current thread name
     * @param proposedThreadName the proposed new thread name
     * @return the actual new thread name.
     *         If {@code null} is returned, the proposed thread name is
     *         discarded (i.e. no rename).
     */
    String determineThreadName(String currentThreadName, String proposedThreadName) throws Exception;
}