/*******************************************************************************
 * ============LICENSE_START==================================================
 * * org.onap.dmaap
 * * ===========================================================================
 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * * ===========================================================================
 * * Licensed 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.
 * * ============LICENSE_END====================================================
 * *
 * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * *
 ******************************************************************************/


package org.onap.dmaap.datarouter.node;

/**
 * Generate publish IDs
 */
public class PublishId {

    private long nextuid;
    private String myname;

    /**
     * Generate publish IDs for the specified name
     *
     * @param myname Unique identifier for this publish ID generator (usually fqdn of server)
     */
    public PublishId(String myname) {
        this.myname = myname;
    }

    /**
     * Generate a Data Router Publish ID that uniquely identifies the particular invocation of the Publish API for log
     * correlation purposes.
     */
    public synchronized String next() {
        long now = System.currentTimeMillis();
        if (now < nextuid) {
            now = nextuid;
        }
        nextuid = now + 1;
        return (now + "." + myname);
    }
}