org.apache.activemq.artemis.utils.IDGenerator Maven / Gradle / Ivy
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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.activemq.artemis.utils;
/**
* Generator of record IDs for the journals.
*
* Notice that while the bindings and messages journals are independent from one another they use
* the same {@link IDGenerator} instance.
*
* The next recordID should be persisted in the journals during a normal shutdown. The lack of such
* a record indicates a server crash. During server restart, if the journals lack a
* {@literal next-recordID} record, we use the last recorded ID plus {@code MAX_INT}.
*/
public interface IDGenerator {
long generateID();
long getCurrentID();
}