/*
 * 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.mesos.runtime.clusterframework.store;

import org.apache.mesos.Protos;
import scala.Option;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * A standalone Mesos worker store.
 */
public class StandaloneMesosWorkerStore implements MesosWorkerStore {

	private Option<Protos.FrameworkID> frameworkID = Option.empty();

	private int taskCount = 0;

	private Map<Protos.TaskID, Worker> storedWorkers = new LinkedHashMap<>();

	public StandaloneMesosWorkerStore() {
	}

	@Override
	public void start() throws Exception {

	}

	@Override
	public void stop(boolean cleanup) throws Exception {

	}

	@Override
	public Option<Protos.FrameworkID> getFrameworkID() throws Exception {
		return frameworkID;
	}

	@Override
	public void setFrameworkID(Option<Protos.FrameworkID> frameworkID) throws Exception {
		this.frameworkID = frameworkID;
	}

	@Override
	public List<Worker> recoverWorkers() throws Exception {
		List<Worker> workers = new ArrayList<>(storedWorkers.size());
		workers.addAll(storedWorkers.values());
		return workers;
	}

	@Override
	public Protos.TaskID newTaskID() throws Exception {
		Protos.TaskID taskID = Protos.TaskID.newBuilder().setValue(TASKID_FORMAT.format(++taskCount)).build();
		return taskID;
	}

	@Override
	public void putWorker(Worker worker) throws Exception {
		storedWorkers.put(worker.taskID(), worker);
	}

	@Override
	public boolean removeWorker(Protos.TaskID taskID) throws Exception {
		Worker prior = storedWorkers.remove(taskID);
		return prior != null;
	}
}