org.apache.omid.tso.TimestampOracle 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.omid.tso;
import java.io.IOException;
/**
* Functionality of a service delivering monotonic increasing timestamps.
*/
public interface TimestampOracle {
/**
* Allows the initialization of the Timestamp Oracle service.
* @throws IOException
* raised if a problem during initialization is shown.
*/
void initialize() throws IOException;
/**
* Returns the next timestamp.
*/
long next();
/**
* Returns the last timestamp assigned.
*/
long getLast();
}