How to use

getSystemNames

method

in

org.apache.samza.config.JavaSystemConfig

/**
 * Get {@link SystemFactory} instances for all the systems defined in this config.
 *
 * @return a map from system name to {@link SystemFactory}
 */
public Map<String, SystemFactory> getSystemFactories() {
 Map<String, SystemFactory> systemFactories = getSystemNames().stream().collect(Collectors.toMap(
  systemName -> systemName,
  systemName -> {
   String systemFactoryClassName = getSystemFactory(systemName);
   if (systemFactoryClassName == null) {
    throw new SamzaException(
      String.format("A stream uses system %s, which is missing from the configuration.", systemName));
   }
   return Util.getObj(systemFactoryClassName, SystemFactory.class);
  }));
 return systemFactories;
}

/**
 * Get {@link SystemFactory} instances for all the systems defined in this config.
 *
 * @return a map from system name to {@link SystemFactory}
 */
public Map<String, SystemFactory> getSystemFactories() {
 Map<String, SystemFactory> systemFactories = getSystemNames().stream().collect(Collectors.toMap(
  systemName -> systemName,
  systemName -> {
   String systemFactoryClassName = getSystemFactory(systemName);
   if (systemFactoryClassName == null) {
    throw new SamzaException(
      String.format("A stream uses system %s, which is missing from the configuration.", systemName));
   }
   return Util.getObj(systemFactoryClassName, SystemFactory.class);
  }));
 return systemFactories;
}

/**
 * Get {@link SystemFactory} instances for all the systems defined in this config.
 *
 * @return a map from system name to {@link SystemFactory}
 */
public Map<String, SystemFactory> getSystemFactories() {
 Map<String, SystemFactory> systemFactories = getSystemNames().stream().collect(Collectors.toMap(
  systemName -> systemName,
  systemName -> {
   String systemFactoryClassName = getSystemFactory(systemName);
   if (systemFactoryClassName == null) {
    throw new SamzaException(
      String.format("A stream uses system %s, which is missing from the configuration.", systemName));
   }
   return Util.getObj(systemFactoryClassName, SystemFactory.class);
  }));
 return systemFactories;
}

/**
 * Get {@link SystemFactory} instances for all the systems defined in this config.
 *
 * @return a map from system name to {@link SystemFactory}
 */
public Map<String, SystemFactory> getSystemFactories() {
 Map<String, SystemFactory> systemFactories = getSystemNames().stream().collect(Collectors.toMap(
  systemName -> systemName,
  systemName -> {
   String systemFactoryClassName = getSystemFactory(systemName);
   if (systemFactoryClassName == null) {
    throw new SamzaException(
      String.format("A stream uses system %s, which is missing from the configuration.", systemName));
   }
   return Util.getObj(systemFactoryClassName, SystemFactory.class);
  }));
 return systemFactories;
}

/**
 * Get {@link SystemFactory} instances for all the systems defined in this config.
 *
 * @return a map from system name to {@link SystemFactory}
 */
public Map<String, SystemFactory> getSystemFactories() {
 Map<String, SystemFactory> systemFactories = getSystemNames().stream().collect(Collectors.toMap(
  systemName -> systemName,
  systemName -> {
   String systemFactoryClassName = getSystemFactory(systemName);
   if (systemFactoryClassName == null) {
    throw new SamzaException(
      String.format("A stream uses system %s, which is missing from the configuration.", systemName));
   }
   return Util.getObj(systemFactoryClassName, SystemFactory.class);
  }));
 return systemFactories;
}

 @Test
 public void testGetSystemNames() {
  Map<String, String> map = new HashMap<String, String>();
  map.put(MOCK_SYSTEM_FACTORY_NAME1, MOCK_SYSTEM_FACTORY_CLASSNAME1);
  map.put(MOCK_SYSTEM_FACTORY_NAME2, MOCK_SYSTEM_FACTORY_CLASSNAME2);
  JavaSystemConfig systemConfig = new JavaSystemConfig(new MapConfig(map));

  assertEquals(2, systemConfig.getSystemNames().size());
  assertTrue(systemConfig.getSystemNames().contains(MOCK_SYSTEM_NAME1));
  assertTrue(systemConfig.getSystemNames().contains(MOCK_SYSTEM_NAME2));
 }
}