/*
 * 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.flink.runtime.checkpoint;

import org.apache.flink.runtime.jobgraph.JobStatus;
import org.apache.flink.runtime.jobmanager.HighAvailabilityMode;

import java.util.concurrent.atomic.AtomicLong;

/**
 * {@link CheckpointIDCounter} instances for JobManagers running in {@link HighAvailabilityMode#NONE}.
 *
 * <p>Simple wrapper around an {@link AtomicLong}.
 */
public class StandaloneCheckpointIDCounter implements CheckpointIDCounter {

	private final AtomicLong checkpointIdCounter = new AtomicLong(1);

	@Override
	public void start() throws Exception {}

	@Override
	public void shutdown(JobStatus jobStatus) throws Exception {}

	@Override
	public long getAndIncrement() throws Exception {
		return checkpointIdCounter.getAndIncrement();
	}

	@Override
	public void setCount(long newCount) {
		checkpointIdCounter.set(newCount);
	}

	/**
	 * Returns the last checkpoint ID (current - 10.
	 *
	 * @return Last checkpoint ID.
	 */
	public long getLast() {
		return checkpointIdCounter.get() - 1;
	}
}

/*
 * 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.flink.runtime.checkpoint;

import org.apache.flink.runtime.jobgraph.JobStatus;
import org.apache.flink.runtime.jobmanager.HighAvailabilityMode;

import java.util.concurrent.atomic.AtomicLong;

/**
 * {@link CheckpointIDCounter} instances for JobManagers running in {@link HighAvailabilityMode#NONE}.
 *
 * <p>Simple wrapper around an {@link AtomicLong}.
 */
public class StandaloneCheckpointIDCounter implements CheckpointIDCounter {

	private final AtomicLong checkpointIdCounter = new AtomicLong(1);

	@Override
	public void start() throws Exception {}

	@Override
	public void shutdown(JobStatus jobStatus) throws Exception {}

	@Override
	public long getAndIncrement() throws Exception {
		return checkpointIdCounter.getAndIncrement();
	}

	@Override
	public void setCount(long newCount) {
		checkpointIdCounter.set(newCount);
	}

	/**
	 * Returns the last checkpoint ID (current - 1).
	 *
	 * @return Last checkpoint ID.
	 */
	public long getLast() {
		return checkpointIdCounter.get() - 1;
	}
}

Correct the javadoc of StandaloneCheckpointIDCounter#getLast