com.amazonaws.auth

Class InstanceProfileCredentialsProvider

java.lang.Object

com.amazonaws.auth.InstanceProfileCredentialsProvider

All Implemented Interfaces:

AWSCredentialsProvider, Closeable, AutoCloseable

public class InstanceProfileCredentialsProvider
extends Object
implements AWSCredentialsProvider, Closeable

Credentials provider implementation that loads credentials from the Amazon EC2 Instance Metadata Service (IMDS).

When using InstanceProfileCredentialsProvider with asynchronous refreshing it is strongly recommended to explicitly call close() to release the async thread.

The provider is configured with the default Instance Metadata Service endpoint. You can override the endpoint value by setting a valid URI as the value of the

1. com.amazonaws.sdk.ec2MetadataServiceEndpointOverride system property or
2. AWS_EC2_METADATA_SERVICE_ENDPOINT environment value

Constructor Summary

Constructors

Constructor and Description
InstanceProfileCredentialsProvider() Deprecated. for the singleton method getInstance().
InstanceProfileCredentialsProvider(boolean refreshCredentialsAsync) Spins up a new thread to refresh the credentials asynchronously if refreshCredentialsAsync is set to true, otherwise the credentials will be refreshed from the instance metadata service synchronously,

Method Summary

Modifier and Type	Method and Description
void	close()
static InstanceProfileCredentialsProvider	createAsyncRefreshingProvider(boolean eagerlyRefreshCredentialsAsync) Spins up a new thread to refresh the credentials asynchronously.
AWSCredentials	getCredentials() Returns AWSCredentials which the caller can use to authorize an AWS request.
static InstanceProfileCredentialsProvider	getInstance() Returns a singleton InstanceProfileCredentialsProvider that does not refresh credentials asynchronously.
void	refresh() Forces this credentials provider to refresh its credentials.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

InstanceProfileCredentialsProvider

@Deprecated
public InstanceProfileCredentialsProvider()

Deprecated. for the singleton method getInstance().

InstanceProfileCredentialsProvider

public InstanceProfileCredentialsProvider(boolean refreshCredentialsAsync)

Spins up a new thread to refresh the credentials asynchronously if refreshCredentialsAsync is set to true, otherwise the credentials will be refreshed from the instance metadata service synchronously,

It is strongly recommended to reuse instances of this credentials provider, especially when async refreshing is used since a background thread is created.

Parameters:

refreshCredentialsAsync - true if credentials needs to be refreshed asynchronously else false.

Method Detail

createAsyncRefreshingProvider

public static InstanceProfileCredentialsProvider createAsyncRefreshingProvider(boolean eagerlyRefreshCredentialsAsync)

Spins up a new thread to refresh the credentials asynchronously.

It is strongly recommended to reuse instances of this credentials provider, especially when async refreshing is used since a background thread is created.

Parameters:

eagerlyRefreshCredentialsAsync - when set to false will not attempt to refresh credentials asynchronously until after a call has been made to getCredentials() - ensures that BaseCredentialsFetcher.getCredentials() is only hit when this CredentialProvider is actually required

getInstance

public static InstanceProfileCredentialsProvider getInstance()

Returns a singleton InstanceProfileCredentialsProvider that does not refresh credentials asynchronously.

See InstanceProfileCredentialsProvider(boolean) or createAsyncRefreshingProvider(boolean) for asynchronous credentials refreshing.

getCredentials

public AWSCredentials getCredentials()

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.

Specified by:

getCredentials in interface AWSCredentialsProvider

Returns:

AWSCredentials which the caller can use to authorize an AWS request.

Throws:

AmazonClientException - if SDKGlobalConfiguration.isEc2MetadataDisabled() is true

refresh

public void refresh()

Description copied from interface: AWSCredentialsProvider

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.

Specified by:

refresh in interface AWSCredentialsProvider

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException