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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.flink.runtime.resourcemanager.slotmanager;

import org.apache.flink.runtime.clusterframework.types.SlotID;
import org.apache.flink.runtime.instance.InstanceID;
import org.apache.flink.runtime.resourcemanager.registration.TaskExecutorConnection;
import org.apache.flink.util.Preconditions;

import java.util.Collection;
import java.util.HashSet;

public class TaskManagerRegistration {

	private final TaskExecutorConnection taskManagerConnection;

	private final HashSet slots;

	private int numberFreeSlots;

	/** Timestamp when the last time becoming idle. Otherwise Long.MAX_VALUE. */
	private long idleSince;

	public TaskManagerRegistration(
		TaskExecutorConnection taskManagerConnection,
		Collection slots) {

		this.taskManagerConnection = Preconditions.checkNotNull(taskManagerConnection, "taskManagerConnection");
		Preconditions.checkNotNull(slots, "slots");

		this.slots = new HashSet<>(slots);

		this.numberFreeSlots = slots.size();

		idleSince = System.currentTimeMillis();
	}

	public TaskExecutorConnection getTaskManagerConnection() {
		return taskManagerConnection;
	}

	public InstanceID getInstanceId() {
		return taskManagerConnection.getInstanceID();
	}

	public int getNumberRegisteredSlots() {
		return slots.size();
	}

	public int getNumberFreeSlots() {
		return numberFreeSlots;
	}

	public void freeSlot() {
		Preconditions.checkState(
			numberFreeSlots < slots.size(),
			"The number of free slots cannot exceed the number of registered slots. This indicates a bug.");
		numberFreeSlots++;

		if (numberFreeSlots == getNumberRegisteredSlots() && idleSince == Long.MAX_VALUE) {
			idleSince = System.currentTimeMillis();
		}
	}

	public void occupySlot() {
		Preconditions.checkState(
			numberFreeSlots > 0,
			"There are no more free slots. This indicates a bug.");
		numberFreeSlots--;

		idleSince = Long.MAX_VALUE;
	}

	public Iterable getSlots() {
		return slots;
	}

	public long getIdleSince() {
		return idleSince;
	}

	public boolean isIdle() {
		return idleSince != Long.MAX_VALUE;
	}

	public void markUsed() {
		idleSince = Long.MAX_VALUE;
	}

	public boolean containsSlot(SlotID slotId) {
		return slots.contains(slotId);
	}
}