Basic Example¶

This is an absolutely minimalistic example of how to use our library.

Required Dependencies¶

Maven

<dependency>
    <groupId>org.carlspring.cloud.aws</groupId>
    <artifactId>s3fs-nio</artifactId>
    <version>1.0.4</version>
</dependency>

Gradle

compile group: 'org.carlspring.cloud.aws', name: 's3fs-nio', version: '1.0.4'

SBT

libraryDependencies += "org.carlspring.cloud.aws" % "s3fs-nio" % "1.0.4"

Basic Code Example¶

You can find some code examples below, along with explanations.

`S3FileSystem` And AmazonS3 Settings¶

All settings for S3FileSystem and the underlying AmazonS3 connector library can be set through system properties or environment variables.

The possible configuration settings can be found here.

Using A Service Locator And System Variables¶

Check that s3fs.access.key and s3fs.secret.key system vars are present with the correct values to have full access to your Amazon S3 bucket.

Use the following code to create the FileSystem and set to a concrete end-point.

FileSystems.newFileSystem(URI.create("s3:///"),
                          new HashMap<>(),
                          Thread.currentThread().getContextClassLoader());

Using A Service Locator And An `amazon.properties` file¶

In your src/main/resources/amazon.properties, add the following settings:

s3fs.access.key=access-key
s3fs.secret.key=secret-key

Use the following code to create the FileSystem and set it to a specific end-point.

FileSystems.newFileSystem(URI.create("s3:///"),
                          new HashMap<>(),
                          Thread.currentThread().getContextClassLoader());

Using Service Locator With Authentication Settings¶

Create a map with the authentication and use it to create the FileSystem and set to a concrete end-point.

import static org.carlspring.cloud.storage.s3fs.S3Factory.ACCESS_KEY;
import static org.carlspring.cloud.storage.s3fs.S3Factory.SECRET_KEY;

...

Map<String, ?> env = ImmutableMap.<String, Object> builder().put(ACCESS_KEY, "access key")
                                                            .put(SECRET_KEY, "secret key")
                                                            .build();

FileSystems.newFileSystem(URI.create("s3:///"),
                          env,
                          Thread.currentThread().getContextClassLoader());

Set End-Point To Reduce Data Latency In Your Applications¶

// Northern Virginia or Pacific Northwest
FileSystems.newFileSystem(URI.create("s3://s3.amazonaws.com/"), 
                          env,
                          Thread.currentThread().getContextClassLoader());

// Northern Virginia only
FileSystems.newFileSystem(URI.create("s3://s3-external-1.amazonaws.com/"),
                          env,
                          Thread.currentThread().getContextClassLoader());

// US West (Oregon) Region
FileSystems.newFileSystem(URI.create("s3://s3-us-west-2.amazonaws.com/"),
                          env,
                          Thread.currentThread().getContextClassLoader());

// US West (Northern California) Region
FileSystems.newFileSystem(URI.create("s3://s3-us-west-1.amazonaws.com/"),
                          env,
                          Thread.currentThread().getContextClassLoader());

// EU (Ireland) Region
FileSystems.newFileSystem(URI.create("s3://s3-eu-west-1.amazonaws.com/"),
                          env,
                          Thread.currentThread().getContextClassLoader());

For a complete list of available regions, you can check the AWS S3 Reference.