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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.checkpoint;

import org.apache.flink.runtime.jobgraph.JobVertexID;
import org.apache.flink.runtime.state.CompositeStateHandle;
import org.apache.flink.runtime.state.SharedStateRegistry;
import org.apache.flink.util.Preconditions;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

/**
 * Simple container class which contains the task state and key-group state handles for the sub
 * tasks of a {@link org.apache.flink.runtime.jobgraph.JobVertex}.
 *
 * This class basically groups all non-partitioned state and key-group state belonging to the same job vertex together.
 *
 * @deprecated Internal class for savepoint backwards compatibility. Don't use for other purposes.
 */
@Deprecated
public class TaskState implements CompositeStateHandle {

	private static final long serialVersionUID = -4845578005863201810L;

	private final JobVertexID jobVertexID;

	/** handles to non-partitioned states, subtaskindex -> subtaskstate. */
	private final Map subtaskStates;

	/** parallelism of the operator when it was checkpointed. */
	private final int parallelism;

	/** maximum parallelism of the operator when the job was first created. */
	private final int maxParallelism;

	/** length of the operator chain. */
	private final int chainLength;

	public TaskState(JobVertexID jobVertexID, int parallelism, int maxParallelism, int chainLength) {
		Preconditions.checkArgument(
				parallelism <= maxParallelism,
				"Parallelism " + parallelism + " is not smaller or equal to max parallelism " + maxParallelism + ".");
		Preconditions.checkArgument(chainLength > 0, "There has to be at least one operator in the operator chain.");

		this.jobVertexID = jobVertexID;

		this.subtaskStates = new HashMap<>(parallelism);

		this.parallelism = parallelism;
		this.maxParallelism = maxParallelism;
		this.chainLength = chainLength;
	}

	public JobVertexID getJobVertexID() {
		return jobVertexID;
	}

	public void putState(int subtaskIndex, SubtaskState subtaskState) {
		Preconditions.checkNotNull(subtaskState);

		if (subtaskIndex < 0 || subtaskIndex >= parallelism) {
			throw new IndexOutOfBoundsException("The given sub task index " + subtaskIndex +
				" exceeds the maximum number of sub tasks " + subtaskStates.size());
		} else {
			subtaskStates.put(subtaskIndex, subtaskState);
		}
	}

	public SubtaskState getState(int subtaskIndex) {
		if (subtaskIndex < 0 || subtaskIndex >= parallelism) {
			throw new IndexOutOfBoundsException("The given sub task index " + subtaskIndex +
				" exceeds the maximum number of sub tasks " + subtaskStates.size());
		} else {
			return subtaskStates.get(subtaskIndex);
		}
	}

	public Collection getStates() {
		return subtaskStates.values();
	}

	public int getNumberCollectedStates() {
		return subtaskStates.size();
	}

	public int getParallelism() {
		return parallelism;
	}

	public int getMaxParallelism() {
		return maxParallelism;
	}

	public int getChainLength() {
		return chainLength;
	}

	@Override
	public void discardState() throws Exception {
		for (SubtaskState subtaskState : subtaskStates.values()) {
			subtaskState.discardState();
		}
	}

	@Override
	public void registerSharedStates(SharedStateRegistry sharedStateRegistry) {
		for (SubtaskState subtaskState : subtaskStates.values()) {
			subtaskState.registerSharedStates(sharedStateRegistry);
		}
	}

	@Override
	public long getStateSize() {
		long result = 0L;

		for (int i = 0; i < parallelism; i++) {
			SubtaskState subtaskState = subtaskStates.get(i);
			if (subtaskState != null) {
				result += subtaskState.getStateSize();
			}
		}

		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj instanceof TaskState) {
			TaskState other = (TaskState) obj;

			return jobVertexID.equals(other.jobVertexID)
					&& parallelism == other.parallelism
					&& subtaskStates.equals(other.subtaskStates);
		} else {
			return false;
		}
	}

	@Override
	public int hashCode() {
		return parallelism + 31 * Objects.hash(jobVertexID, subtaskStates);
	}

	public Map getSubtaskStates() {
		return Collections.unmodifiableMap(subtaskStates);
	}

	@Override
	public String toString() {
		// KvStates are always null in 1.1. Don't print this as it might
		// confuse users that don't care about how we store it internally.
		return "TaskState(" +
			"jobVertexID: " + jobVertexID +
			", parallelism: " + parallelism +
			", sub task states: " + subtaskStates.size() +
			", total size (bytes): " + getStateSize() +
			')';
	}
}