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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service
/*
* Copyright 2011-2024 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.
* You may obtain a copy of the License at:
*
* http://aws.amazon.com/apache2.0
*
* 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.services.dynamodbv2.datamodeling;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.internal.StaticCredentialsProvider;
import com.amazonaws.regions.RegionUtils;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.Region;
import com.amazonaws.services.s3.transfer.TransferManager;
/**
* A smart Map for {@link AmazonS3} objects. {@link S3ClientCache} keeps the
* clients organized by region, and if provided {@link AWSCredentials} will
* create clients on the fly. Otherwise it just return clients given to it with
* {@link #useClient(AmazonS3)}.
*/
public class S3ClientCache {
private final ConcurrentMap clientsByRegion = new ConcurrentHashMap();
private final Map transferManagersByRegion = new ConcurrentHashMap();
private final AWSCredentialsProvider awscredentialsProvider;
@Deprecated
S3ClientCache(AWSCredentials credentials) {
this(new StaticCredentialsProvider(credentials));
}
/**
* Create a client cache using the given AWSCredentialsProvider. If
* {@link #getClient(Regions)} or {@link #getTransferManager(Regions)} is
* called and a client has not been provided for the region, the cache will
* instantiate one from the provided {@link AWSCredentialsProvider}.
*
* @param awsCredentialsProvider
* The credentials provider to use when creating new
* {@link AmazonS3}.
*/
S3ClientCache(AWSCredentialsProvider awsCredentialsProvider) {
this.awscredentialsProvider = awsCredentialsProvider;
}
/**
* Force the client cache to provide a certain client for the region which
* that client is configured. This can be useful to provide clients with
* different {@link com.amazonaws.services.s3.S3ClientOptions} or use a
* {@link com.amazonaws.services.s3.AmazonS3EncryptionClient} in place of a
* regular client.
*
* Using a new client will also forcibly shut down any
* {@link TransferManager} that has been instantiated with that client, with
* the {@link TransferManager#shutdownNow()} method.
*
* @param client
* An {@link AmazonS3} to use in the cache. Its region will
* be detected automatically.
*/
public void useClient(AmazonS3 client) {
String region = client.getRegionName();
synchronized (transferManagersByRegion) {
TransferManager tm = transferManagersByRegion.remove(region);
if (tm != null) {
tm.shutdownNow();
}
clientsByRegion.put(region, client);
}
}
/**
* Returns a client for the requested region, or throws an exception when
* unable.
*
* @param region
* The region the returned {@link AmazonS3} will be
* configured to use.
* @return A client for the given region from the cache, either instantiated
* automatically from the provided {@link AWSCredentials} or
* provided with {@link #useClient(AmazonS3)}.
* @throws IllegalArgumentException
* When a region is requested that has not been provided to the
* cache with {@link #useClient(AmazonS3)}, and the cache
* has no {@link AWSCredentials} with which a client may be
* instantiated.
*/
public AmazonS3 getClient(Region region) {
if (region == null) {
throw new IllegalArgumentException("S3 region must be specified");
}
return getClient(region.toAWSRegion().getName());
}
/**
* Returns a client for the requested region, or throws an exception when
* unable.
*
* @param region
* The region the returned {@link AmazonS3} will be
* configured to use.
* @return A client for the given region from the cache, either instantiated
* automatically from the provided {@link AWSCredentials} or
* provided with {@link #useClient(AmazonS3)}.
* @throws IllegalArgumentException
* When a region is requested that has not been provided to the
* cache with {@link #useClient(AmazonS3)}, and the cache
* has no {@link AWSCredentials} with which a client may be
* instantiated.
*/
public AmazonS3 getClient(String region) {
if (region == null) {
throw new IllegalArgumentException("S3 region must be specified");
}
AmazonS3 client = clientsByRegion.get(region);
return client != null ? client : cacheClient(region);
}
/**
* Returns a new client with region configured to
* region.
* Also updates the clientsByRegion map by associating the
* new client with region.
*
* @param region
* The region the returned {@link AmazonS3} will be
* configured to use.
* @return A new {@link AmazonS3} client with region set to region.
*/
private AmazonS3 cacheClient(String region) {
if (awscredentialsProvider == null) {
throw new IllegalArgumentException("No credentials provider found to connect to S3");
}
AmazonS3 client = new AmazonS3Client(awscredentialsProvider);
client.setRegion(RegionUtils.getRegion(region));
clientsByRegion.put(region, client);
return client;
}
/**
* Returns a {@link TransferManager} for the given region, or throws an
* exception when unable. The returned {@link TransferManager} will always
* be instantiated from whatever {@link AmazonS3} is in the cache,
* whether provided with {@link #useClient(AmazonS3)} or instantiated
* automatically from {@link AWSCredentials}.
*
* Any {@link TransferManager} returned could be shut down if a new
* underlying {@link AmazonS3} is provided with
* {@link #useClient(AmazonS3)}.
*
* @param region
* The region the returned {@link TransferManager} will be
* configured to use.
* @return A transfer manager for the given region from the cache, or one
* instantiated automatically from any existing
* {@link AmazonS3},
*/
public TransferManager getTransferManager(Region region) {
return getTransferManager(region.toAWSRegion().getName());
}
/**
* Returns a {@link TransferManager} for the given region, or throws an
* exception when unable. The returned {@link TransferManager} will always
* be instantiated from whatever {@link AmazonS3} is in the cache,
* whether provided with {@link #useClient(AmazonS3)} or instantiated
* automatically from {@link AWSCredentials}.
*
* Any {@link TransferManager} returned could be shut down if a new
* underlying {@link AmazonS3} is provided with
* {@link #useClient(AmazonS3)}.
*
* @param region
* The region string the returned {@link TransferManager} will be
* configured to use.
* @return A transfer manager for the given region from the cache, or one
* instantiated automatically from any existing
* {@link AmazonS3},
*/
public TransferManager getTransferManager(String region) {
synchronized (transferManagersByRegion) {
TransferManager tm = transferManagersByRegion.get(region);
if (tm == null) {
tm = new TransferManager(getClient(region));
transferManagersByRegion.put(region, tm);
}
return tm;
}
}
}