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The AWS SDK for Java with support for OSGi. The AWS 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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/*
 * Copyright 2011-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.auth;

import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.annotation.ThreadSafe;
import com.amazonaws.internal.SdkPredicate;

import java.util.Date;

/**
 * Predicate to determine when we do a blocking, synchronous refresh of session credentials in
 * STSSessionCredentialsProvider and STSAssumeRoleSessionCredentialsProvider.
 */
@SdkInternalApi
@ThreadSafe
class ShouldDoBlockingSessionRefresh extends SdkPredicate {

    /**
     * Time before expiry within which credentials will be renewed synchronously.
     */
    private static final int EXPIRY_TIME_MILLIS = 60 * 1000;

    @Override
    public boolean test(SessionCredentialsHolder sessionCredentialsHolder) {
        return sessionCredentialsHolder == null ||
               expiring(sessionCredentialsHolder.getSessionCredentialsExpiration());
    }

    /**
     * Session credentials that expire in less than a minute are considered expiring.
     *
     * @param expiry expiration time of a session
     */
    private static boolean expiring(Date expiry) {
        long timeRemaining = expiry.getTime() - System.currentTimeMillis();
        return timeRemaining < EXPIRY_TIME_MILLIS;
    }
}