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The Amazon Kinesis Client Library for Java enables Java developers to easily consume and process data from Amazon Kinesis.

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/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates.
 * Licensed 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 com.amazonaws.services.kinesis.clientlibrary.lib.worker;

import com.amazonaws.services.kinesis.clientlibrary.types.ShutdownInput;
import static com.amazonaws.services.kinesis.clientlibrary.lib.worker.ConsumerStates.ConsumerState;
import static com.amazonaws.services.kinesis.clientlibrary.lib.worker.ConsumerStates.ShardConsumerState;


/**
 * Reason the RecordProcessor is being shutdown.
 * Used to distinguish between a fail-over vs. a termination (shard is closed and all records have been delivered).
 * In case of a fail over, applications should NOT checkpoint as part of shutdown,
 * since another record processor may have already started processing records for that shard.
 * In case of termination (resharding use case), applications SHOULD checkpoint their progress to indicate
 * that they have successfully processed all the records (processing of child shards can then begin).
 */
public enum ShutdownReason {
    /**
     * Processing will be moved to a different record processor (fail over, load balancing use cases).
     * Applications SHOULD NOT checkpoint their progress (as another record processor may have already started
     * processing data).
     */
    ZOMBIE(3, ShardConsumerState.SHUTTING_DOWN.getConsumerState()),

    /**
     * Terminate processing for this RecordProcessor (resharding use case).
     * Indicates that the shard is closed and all records from the shard have been delivered to the application.
     * Applications SHOULD checkpoint their progress to indicate that they have successfully processed all records
     * from this shard and processing of child shards can be started.
     */
    TERMINATE(2, ShardConsumerState.SHUTTING_DOWN.getConsumerState()),

    /**
     * Indicates that the entire application is being shutdown, and if desired the record processor will be given a
     * final chance to checkpoint. This state will not trigger a direct call to
     * {@link com.amazonaws.services.kinesis.clientlibrary.interfaces.v2.IRecordProcessor#shutdown(ShutdownInput)}, but
     * instead depend on a different interface for backward compatibility.
     */
    REQUESTED(1, ShardConsumerState.SHUTDOWN_REQUESTED.getConsumerState());

    private final int rank;
    private final ConsumerState shutdownState;

    ShutdownReason(int rank, ConsumerState shutdownState) {
        this.rank = rank;
        this.shutdownState = shutdownState;
    }

    /**
     * Indicates whether the given reason can override the current reason.
     * 
     * @param reason the reason to transition to
     * @return true if the transition is allowed, false if it's not.
     */
    public boolean canTransitionTo(ShutdownReason reason) {
        if (reason == null) {
            return false;
        }
        return reason.rank > this.rank;
    }

    ConsumerState getShutdownState() {
        return shutdownState;
    }
}