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SingularityNet Java SDK

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Implementing SingularityNet service client in Java

  1. Create new maven project, see Maven getting started. Add Jitpack maven repo into the project to be able using SingularityNet Java SDK artifacts:
<project>

  <repositories>
    <repository>
      <id>jitpack.io</id>
      <url>https://jitpack.io</url>
    </repository>
  </repositories>

</project>
  1. Use snet-sdk-maven-plugin to get service protobuf API within your project:
<project>
  <properties>
    <snet.sdk.java.version>master-SNAPSHOT</snet.sdk.java.version>
  </properties>

  <build>
    <plugins>

      <plugin>
        <groupId>com.github.singnet.snet-sdk-java</groupId>
        <artifactId>snet-sdk-maven-plugin</artifactId>
        <version>${snet.sdk.java.version}</version>

        <executions>
          <execution>

            <configuration>
              <!-- service organization id -->
              <orgId>snet</orgId>
              <!-- service id -->
              <serviceId>cntk-image-recon</serviceId>
              <!-- API output dir -->
              <outputDir>${project.build.directory}/proto</outputDir>
              <!-- desired java package for classes generated -->
              <javaPackage>io.singularitynet.client.cntk</javaPackage>
              <!-- Ethereum RPC endpoint to use -->
              <ethereumJsonRpcEndpoint>https://mainnet.infura.io/v3/e7732e1f679e461b9bb4da5653ac3fc2</ethereumJsonRpcEndpoint>
            </configuration>

            <goals>
              <goal>get</goal>
            </goals>

          </execution>
        </executions>

      </plugin>

    </plugins>
  </build>
</project>
  1. Add SingularityNet Java SDK as dependency:
	<dependency>
	    <groupId>com.github.singnet.snet-sdk-java</groupId>
	    <artifactId>snet-sdk-java</artifactId>
	    <version>${snet.sdk.java.version}</version>
	</dependency>

  1. Use protobuf-maven-plugin to generate Java stubs of service API:

  2. Write Java client app using SDK API, see CntkImageRecognition.java as example:

    // Create SDK configuration
    Configuration config = Configuration.newBuilder()
        .setEthereumJsonRpcEndpoint("https://mainnet.infura.io/v3/" /* + your infura project id */)
        .setIdentityType(Configuration.IdentityType.PRIVATE_KEY)
        .setIdentityPrivateKey(new byte[] { /* identity private key */ });

    // Create SDK instance
    Sdk sdk = new Sdk(config);
    try {

        // Choose payment strategy
        PaymentStrategy paymentStrategy = new OnDemandPaymentChannelPaymentStrategy(sdk);

        // Create new service client instance
        ServiceClient serviceClient = sdk.newServiceClient("snet",
                "cntk-image-recon", "default_group", paymentStrategy); 
        try {

            // Get gRPC API stub
            RecognizerBlockingStub stub = serviceClient.getGrpcStub(RecognizerGrpc::newBlockingStub);
            
            // Call method
            Input input = Input.newBuilder()
                .setModel("ResNet152")
                .setImgPath("https://d2z4fd79oscvvx.cloudfront.net/0027071_1_single_rose_385.jpeg")
                .build();
            Output output = stub.flowers(input);
            System.out.println("Response received: " + output);

        } finally {
            // Shutdown service client
            serviceClient.close();
        }

    } finally {
        // Shutdown SDK
        sdk.close();
    }

How to build

Integration testing is disabled by default. To run full build including integration tests use:

mvn install -DskipITs=false -P run-integration-environment

The command about automatically starts integration environment docker before running tests and stops after it. To start integration environment manually execute:

docker run -d \
    --name java-sdk-integration-environment \
    -p 5002:5002 -p 8545:8545 -p 7000:7000 \
    singularitynet/java-sdk-integration-test-env:3.0.0

Then you can run build with integration testing using:

mvn install -DskipITs=false

Running integration tests is a time consuming process so to make fast build running unit tests only use:

mvn install

Class diagram

Class diagram Source code