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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.spark.streaming.kinesis
import org.apache.spark.Logging
import org.apache.spark.streaming.Duration
import org.apache.spark.streaming.util.Clock
import org.apache.spark.streaming.util.ManualClock
import org.apache.spark.streaming.util.SystemClock
/**
* This is a helper class for managing checkpoint clocks.
*
* @param checkpointInterval
* @param currentClock. Default to current SystemClock if none is passed in (mocking purposes)
*/
private[kinesis] class KinesisCheckpointState(
checkpointInterval: Duration,
currentClock: Clock = new SystemClock())
extends Logging {
/* Initialize the checkpoint clock using the given currentClock + checkpointInterval millis */
val checkpointClock = new ManualClock()
checkpointClock.setTime(currentClock.currentTime() + checkpointInterval.milliseconds)
/**
* Check if it's time to checkpoint based on the current time and the derived time
* for the next checkpoint
*
* @return true if it's time to checkpoint
*/
def shouldCheckpoint(): Boolean = {
new SystemClock().currentTime() > checkpointClock.currentTime()
}
/**
* Advance the checkpoint clock by the checkpoint interval.
*/
def advanceCheckpoint() = {
checkpointClock.addToTime(checkpointInterval.milliseconds)
}
}
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