clientWithWaiters.java

    public static ArrayList<String> clientWithWaiters(int numberOfInstances) throws Exception {
        long startTime = System.nanoTime();
        System.out.println("-----------------------------------------------------------------------");
        ArrayList<String> instanceIds = new ArrayList<>();
        // Configure the client
        ClientConfiguration clientConfig = ClientConfiguration.builder()
                .connectionTimeoutMillis(3000)
                .readTimeoutMillis(60000)
                .build();
        // Using default profile
        AuthenticationDetailsProvider authenticationDetailsProvider = new ConfigFileAuthenticationDetailsProvider("DEFAULT");
        // Set Region
        IdentityClient identityClient = IdentityClient.builder().build(authenticationDetailsProvider);
        identityClient.setRegion(Region.valueOf(System.getenv("REGION")));
        // Create compute client
        ComputeClient computeClient = ComputeClient.builder()
                .configuration(clientConfig)
                .build(authenticationDetailsProvider);
        computeClient.setRegion(Region.valueOf(System.getenv("REGION")));
        // Creating work request client to be able to wait on it
        WorkRequestClient workRequestClient = WorkRequestClient.builder().build(authenticationDetailsProvider);
        workRequestClient.setRegion(Region.valueOf(System.getenv("REGION")));
        // Creating waiters
        ComputeWaiters computeWaiters = computeClient.newWaiters(workRequestClient);

        // oci compute instance launch --display-name "test-$i"
        // --availability-domain $AD --compartment-id $COMPARTMENT_ID
        // --shape VM.Standard.E2.1 --subnet-id $SUBNET_ID
        // --image-id $IMAGE_ID
        // --raw-output --query 'data.id'
        // lets cheat from cli command
        String availabilityDomain = System.getenv("AD");
        String compartmentId = System.getenv("COMPARTMENT_ID");
        String imageId = System.getenv("IMAGE_ID");
        String subnetId = System.getenv("SUBNET_ID");
        String shape = System.getenv("SHAPE");
        String instanceName = System.getenv("INSTANCE_NAME_PREFIX");

        for (int i = 0; i < numberOfInstances; i++) {
            long startTime1 = System.nanoTime();
            // Set instance details
            LaunchInstanceDetails launchInstanceDetails = LaunchInstanceDetails.builder()
                    .availabilityDomain(availabilityDomain)
                    .compartmentId(compartmentId)
                    .displayName(instanceName + (i+1))
                    .imageId(imageId)
                    .subnetId(subnetId)
                    .shape(shape)
                    .build();
            // Actual request
            LaunchInstanceRequest launchInstanceRequest = LaunchInstanceRequest.builder()
                    .launchInstanceDetails(launchInstanceDetails)
                    .build();
            // Execute waiter callback and wait
            LaunchInstanceResponse launchInstanceResponse = computeWaiters.forLaunchInstance(launchInstanceRequest).execute();

            GetInstanceRequest getInstanceRequest = GetInstanceRequest.builder()
                    .instanceId(launchInstanceResponse.getInstance().getId())
                    .build();
            String instanceId = getInstanceRequest.getInstanceId();
            // Execute another waiter callback and wait until compute instance is in RUNNING state
            GetInstanceResponse getInstanceResponse = computeWaiters.forInstance(getInstanceRequest, Instance.LifecycleState.Running).execute();
            Instance instance = getInstanceResponse.getInstance();
            instanceId = instance.getId();
            instanceIds.add(instanceId);
            // How long did it take
            long elapsedTime1 = System.nanoTime() - startTime1;
            System.out.println(instanceId + " created in " + (elapsedTime1 / 1000000) + " ms");
        }
        // Display total duration
        long elapsedTime = System.nanoTime() - startTime;
        System.out.println("Total execution time in seconds: " + TimeUnit.MILLISECONDS.toSeconds(elapsedTime / 1000000));
        System.out.println("-----------------------------------------------------------------------");
        return instanceIds;
    }