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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.state.ChainedStateHandle;
import org.apache.flink.runtime.state.CompositeStateHandle;
import org.apache.flink.runtime.state.OperatorStateHandle;
import org.apache.flink.runtime.state.KeyedStateHandle;
import org.apache.flink.runtime.state.SharedStateRegistry;
import org.apache.flink.runtime.state.StateObject;
import org.apache.flink.runtime.state.StateUtil;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Arrays;

/**
 * Container for the chained state of one parallel subtask of an operator/task. This is part of the
 * {@link TaskState}.
 */
public class SubtaskState implements CompositeStateHandle {

	private static final Logger LOG = LoggerFactory.getLogger(SubtaskState.class);

	private static final long serialVersionUID = -2394696997971923995L;

	/**
	 * Snapshot from the {@link org.apache.flink.runtime.state.OperatorStateBackend}.
	 */
	private final ChainedStateHandle managedOperatorState;

	/**
	 * Snapshot written using {@link org.apache.flink.runtime.state.OperatorStateCheckpointOutputStream}.
	 */
	private final ChainedStateHandle rawOperatorState;

	/**
	 * Snapshot from {@link org.apache.flink.runtime.state.KeyedStateBackend}.
	 */
	private final KeyedStateHandle managedKeyedState;

	/**
	 * Snapshot written using {@link org.apache.flink.runtime.state.KeyedStateCheckpointOutputStream}.
	 */
	private final KeyedStateHandle rawKeyedState;

	/**
	 * The state size. This is also part of the deserialized state handle.
	 * We store it here in order to not deserialize the state handle when
	 * gathering stats.
	 */
	private final long stateSize;

	public SubtaskState(
			ChainedStateHandle managedOperatorState,
			ChainedStateHandle rawOperatorState,
			KeyedStateHandle managedKeyedState,
			KeyedStateHandle rawKeyedState) {

		this.managedOperatorState = managedOperatorState;
		this.rawOperatorState = rawOperatorState;
		this.managedKeyedState = managedKeyedState;
		this.rawKeyedState = rawKeyedState;

		try {
			long calculateStateSize = getSizeNullSafe(managedOperatorState);
			calculateStateSize += getSizeNullSafe(rawOperatorState);
			calculateStateSize += getSizeNullSafe(managedKeyedState);
			calculateStateSize += getSizeNullSafe(rawKeyedState);
			stateSize = calculateStateSize;
		} catch (Exception e) {
			throw new RuntimeException("Failed to get state size.", e);
		}
	}

	private static final long getSizeNullSafe(StateObject stateObject) throws Exception {
		return stateObject != null ? stateObject.getStateSize() : 0L;
	}

	// --------------------------------------------------------------------------------------------

	public ChainedStateHandle getManagedOperatorState() {
		return managedOperatorState;
	}

	public ChainedStateHandle getRawOperatorState() {
		return rawOperatorState;
	}

	public KeyedStateHandle getManagedKeyedState() {
		return managedKeyedState;
	}

	public KeyedStateHandle getRawKeyedState() {
		return rawKeyedState;
	}

	@Override
	public void discardState() {
		try {
			StateUtil.bestEffortDiscardAllStateObjects(
				Arrays.asList(
					managedOperatorState,
					rawOperatorState,
					managedKeyedState,
					rawKeyedState));
		} catch (Exception e) {
			LOG.warn("Error while discarding operator states.", e);
		}
	}

	@Override
	public void registerSharedStates(SharedStateRegistry sharedStateRegistry) {
		if (managedKeyedState != null) {
			managedKeyedState.registerSharedStates(sharedStateRegistry);
		}

		if (rawKeyedState != null) {
			rawKeyedState.registerSharedStates(sharedStateRegistry);
		}
	}

	@Override
	public long getStateSize() {
		return stateSize;
	}

	// --------------------------------------------------------------------------------------------

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}

		SubtaskState that = (SubtaskState) o;

		if (stateSize != that.stateSize) {
			return false;
		}

		if (managedOperatorState != null ?
				!managedOperatorState.equals(that.managedOperatorState)
				: that.managedOperatorState != null) {
			return false;
		}
		if (rawOperatorState != null ?
				!rawOperatorState.equals(that.rawOperatorState)
				: that.rawOperatorState != null) {
			return false;
		}
		if (managedKeyedState != null ?
				!managedKeyedState.equals(that.managedKeyedState)
				: that.managedKeyedState != null) {
			return false;
		}
		return rawKeyedState != null ?
				rawKeyedState.equals(that.rawKeyedState)
				: that.rawKeyedState == null;

	}

	@Override
	public int hashCode() {
		int result = (managedOperatorState != null ? managedOperatorState.hashCode() : 0);
		result = 31 * result + (rawOperatorState != null ? rawOperatorState.hashCode() : 0);
		result = 31 * result + (managedKeyedState != null ? managedKeyedState.hashCode() : 0);
		result = 31 * result + (rawKeyedState != null ? rawKeyedState.hashCode() : 0);
		result = 31 * result + (int) (stateSize ^ (stateSize >>> 32));
		return result;
	}

	@Override
	public String toString() {
		return "SubtaskState{" +
				"operatorStateFromBackend=" + managedOperatorState +
				", operatorStateFromStream=" + rawOperatorState +
				", keyedStateFromBackend=" + managedKeyedState +
				", keyedStateFromStream=" + rawKeyedState +
				", stateSize=" + stateSize +
				'}';
	}
}