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A client-side Java library to interact with Scalar DL network.
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package com.scalar.dl.client.tool;

import com.scalar.dl.client.config.ClientConfig;
import com.scalar.dl.client.exception.ClientException;
import com.scalar.dl.client.service.ClientService;
import com.scalar.dl.client.service.ClientServiceFactory;
import java.io.File;
import java.util.Optional;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import javax.json.Json;
import javax.json.JsonObject;
import picocli.CommandLine;
import picocli.CommandLine.Command;

@Command(name = "smallbank-loader", description = "Create accounts for smallbank workload.")
public class SmallbankLoader implements Callable {

  @CommandLine.Option(
      names = {"--properties", "--config"},
      required = true,
      paramLabel = "PROPERTIES_FILE",
      description = "A configuration file in properties format.")
  private String properties;

  @CommandLine.Option(
      names = {"--num-accounts"},
      required = false,
      paramLabel = "NUM_ACCOUNTS",
      description = "The number of target accounts.")
  private int numAccounts = 10000;

  @CommandLine.Option(
      names = {"--num-threads"},
      required = false,
      paramLabel = "NUM_THREADS",
      description = "The number of threads to run.")
  private int numThreads = 1;

  @CommandLine.Option(
      names = {"-h", "--help"},
      usageHelp = true,
      description = "display the help message.")
  boolean helpRequested;

  private static final AtomicInteger counter = new AtomicInteger(0);
  private static final String contractId = "create_account";
  private static final int DEFAULT_BALANCE = 100000;

  public static void main(String[] args) {
    int exitCode = new CommandLine(new SmallbankLoader()).execute(args);
    System.exit(exitCode);
  }

  @Override
  public Integer call() throws Exception {
    ClientServiceFactory factory = new ClientServiceFactory(new ClientConfig(new File(properties)));
    ClientService service = factory.getClientService();

    ExecutorService executor = Executors.newFixedThreadPool(numThreads);
    for (int i = 0; i < numThreads; ++i) {
      executor.execute(
          () -> {
            while (true) {
              int id = counter.getAndIncrement();
              JsonObject jsonArgument =
                  Json.createObjectBuilder()
                      .add("customer_id", id)
                      .add("customer_name", "Name " + id)
                      .add("initial_checking_balance", DEFAULT_BALANCE)
                      .add("initial_savings_balance", DEFAULT_BALANCE)
                      .build();
              try {
                if (counter.get() > numAccounts) {
                  break;
                }
                service.executeContract(contractId, jsonArgument, Optional.empty());
              } catch (ClientException e) {
                e.printStackTrace();
              }
            }
          });
    }

    while (counter.get() <= numAccounts) {
      System.out.println(counter.get() + " assets are loaded.");

      try {
        Thread.sleep(1000);
      } catch (InterruptedException e) {
        // ignore
      }
    }

    executor.shutdown();
    executor.awaitTermination(10, TimeUnit.SECONDS);

    return 0;
  }
}