com.amazonaws.services.simpleworkflow.flow.interceptors.FixedIntervalInvocationSchedule Maven / Gradle / Ivy

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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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package com.amazonaws.services.simpleworkflow.flow.interceptors;

import java.util.Date;

import com.amazonaws.services.simpleworkflow.flow.common.FlowConstants;

/**
 * Schedule that represents invocations with a fixed delay up to a specified expiration interval or count.
 * 
 * @author fateev
 */
public class FixedIntervalInvocationSchedule implements InvocationSchedule {

    protected static final int SECOND = 1000;

    private final long intervalMilliseconds;
    private final long expirationMilliseconds;
    private final int maxInvocationCount;

    public FixedIntervalInvocationSchedule(int intervalSeconds, int expirationSeconds, int maxInvocationCount) {
        this.intervalMilliseconds = intervalSeconds * SECOND;
        this.expirationMilliseconds = expirationSeconds * SECOND;
        this.maxInvocationCount = maxInvocationCount;
    }
    
    public FixedIntervalInvocationSchedule(int intervalSeconds, int expirationSeconds) {
        this.intervalMilliseconds = intervalSeconds * SECOND;
        this.expirationMilliseconds = expirationSeconds * SECOND;
        this.maxInvocationCount = Integer.MAX_VALUE;
    }

    @Override
    public long nextInvocationDelaySeconds(Date currentTime, Date startTime, Date lastInvocationTime, int pastInvocatonsCount) {
        if (pastInvocatonsCount >= maxInvocationCount) {
            return FlowConstants.NONE;
        }
        long resultMilliseconds;
        if (lastInvocationTime == null) {
            resultMilliseconds = startTime.getTime() + intervalMilliseconds - currentTime.getTime();
        }
        else {
            resultMilliseconds = lastInvocationTime.getTime() + intervalMilliseconds - currentTime.getTime();
        }
        if (resultMilliseconds < 0) {
            resultMilliseconds = 0;
        }
        if (currentTime.getTime() + resultMilliseconds - startTime.getTime() >= expirationMilliseconds) {
            return FlowConstants.NONE;
        }
        return resultMilliseconds / SECOND;
    }

}