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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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/*
 * Copyright 2011-2014 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;

/**
 * Interface for providing AWS credentials. Implementations are free to use any
 * strategy for providing AWS credentials, such as simply providing static
 * credentials that don't change, or more complicated implementations, such as
 * integrating with existing key management systems.
 */
public interface AWSCredentialsProvider {

    /**
     * Returns AWSCredentials which the caller can use to authorize an AWS request.
     * Each implementation of AWSCredentialsProvider can chose its own strategy for
     * loading credentials.  For example, an implementation might load credentials
     * from an existing key management system, or load new credentials when
     * credentials are rotated.
     *
     * @return AWSCredentials which the caller can use to authorize an AWS request.
     */
    public AWSCredentials getCredentials();

    /**
     * Forces this credentials provider to refresh its credentials. For many
     * implementations of credentials provider, this method may simply be a
     * no-op, such as any credentials provider implementation that vends
     * static/non-changing credentials. For other implementations that vend
     * different credentials through out their lifetime, this method should
     * force the credentials provider to refresh its credentials.
     */
    public void refresh();

}