How to use

nullSafeList

method

in

org.springframework.data.gemfire.util.CollectionUtils

/**
 * Returns a {@link List} of application domain object fields to be indexed.
 *
 * @return a {@link List} of application domain object fields to be indexed.
 * @see #getFieldAnalyzers()
 * @see java.util.List
 */
protected List<String> getFields() {
  return nullSafeList(this.fields);
}

/**
 * Returns a {@link List} of application domain object fields to be indexed.
 *
 * @return a {@link List} of application domain object fields to be indexed.
 * @see #getFieldAnalyzers()
 * @see java.util.List
 */
protected List<String> getFields() {
  return nullSafeList(this.fields);
}

/**
 * Sets names of regions to be included for JSON conversion. By default, all regions will be included
 *
 * @param regionNames a List of region names to include
 */
public void setIncludedRegionNames(List<String> regionNames) {
  this.includedRegions = nullSafeList(regionNames);
}

/**
 * Sets names of regions to be included for JSON conversion. By default, all regions will be included
 *
 * @param regionNames a List of region names to include
 */
public void setIncludedRegionNames(List<String> regionNames) {
  this.includedRegions = nullSafeList(regionNames);
}

protected List<CacheFactoryBean.JndiDataSource> getJndiDataSources() {
  return nullSafeList(this.jndiDataSources);
}

protected List<TransactionListener> getTransactionListeners() {
  return nullSafeList(this.transactionListeners);
}

protected List<TransactionListener> getTransactionListeners() {
  return nullSafeList(this.transactionListeners);
}

protected List<CacheFactoryBean.JndiDataSource> getJndiDataSources() {
  return nullSafeList(this.jndiDataSources);
}

public void setFixedPartitionAttributes(List<FixedPartitionAttributes> fixedPartitionAttributes) {
  nullSafeList(fixedPartitionAttributes).forEach(this.partitionAttributesFactory::addFixedPartitionAttributes);
}

public void setFixedPartitionAttributes(List<FixedPartitionAttributes> fixedPartitionAttributes) {
  nullSafeList(fixedPartitionAttributes).forEach(this.partitionAttributesFactory::addFixedPartitionAttributes);
}

  private String toCommaDelimitedHostAndPortsString(List<InetSocketAddress> socketAddresses) {

    return StringUtils.collectionToCommaDelimitedString(nullSafeList(socketAddresses).stream()
      .filter(Objects::nonNull)
      .map(socketAddress -> String.format("%1$s:%2$d", socketAddress.getHostName(), socketAddress.getPort()))
      .collect(Collectors.toList()));
  }
}

/**
 * @inheritDoc
 */
@Override
public void afterPropertiesSet() throws Exception {
  nullSafeList(partitionListeners).forEach(partitionAttributesFactory::addPartitionListener);
  this.partitionAttributes = partitionAttributesFactory.create();
}

/**
 * Sets regions to be included for JSON conversion. By default, all regions will be included
 *
 * @param regions a List of region names to include
 */
public void setIncludedRegions(List<Region<?, ?>> regions) {
  nullSafeList(regions).forEach(region -> this.includedRegions.add(toRegionName(region)));
}

/**
 * @inheritDoc
 */
@Override
public void afterPropertiesSet() throws Exception {
  nullSafeList(partitionListeners).forEach(partitionAttributesFactory::addPartitionListener);
  this.partitionAttributes = partitionAttributesFactory.create();
}

/**
 * Sets regions to be included for JSON conversion. By default, all regions will be included
 *
 * @param regions a List of region names to include
 */
public void setIncludedRegions(List<Region<?, ?>> regions) {
  nullSafeList(regions).forEach(region -> this.includedRegions.add(toRegionName(region)));
}

private ManagedList<BeanDefinition> parseSnapshots(Element element, ParserContext parserContext,
    String childTagName) {
  ManagedList<BeanDefinition> snapshotBeans = new ManagedList<>();
  nullSafeList(DomUtils.getChildElementsByTagName(element, childTagName)).forEach(childElement ->
    snapshotBeans.add(parseSnapshotMetadata(childElement, parserContext)));
  return snapshotBeans;
}

private ManagedList<BeanDefinition> parseSnapshots(Element element, ParserContext parserContext,
    String childTagName) {
  ManagedList<BeanDefinition> snapshotBeans = new ManagedList<>();
  nullSafeList(DomUtils.getChildElementsByTagName(element, childTagName)).forEach(childElement ->
    snapshotBeans.add(parseSnapshotMetadata(childElement, parserContext)));
  return snapshotBeans;
}

@Override
protected void doInit() {
  Assert.state(this.asyncEventListener != null, "AsyncEventListener must not be null");
  AsyncEventQueueFactory asyncEventQueueFactory =
    this.factory != null ? (AsyncEventQueueFactory) this.factory : this.cache.createAsyncEventQueueFactory();
  Optional.ofNullable(this.batchConflationEnabled).ifPresent(asyncEventQueueFactory::setBatchConflationEnabled);
  Optional.ofNullable(this.batchSize).ifPresent(asyncEventQueueFactory::setBatchSize);
  Optional.ofNullable(this.batchTimeInterval).ifPresent(asyncEventQueueFactory::setBatchTimeInterval);
  Optional.ofNullable(this.diskStoreReference).ifPresent(asyncEventQueueFactory::setDiskStoreName);
  Optional.ofNullable(this.diskSynchronous).ifPresent(asyncEventQueueFactory::setDiskSynchronous);
  Optional.ofNullable(this.dispatcherThreads).ifPresent(asyncEventQueueFactory::setDispatcherThreads);
  Optional.ofNullable(this.forwardExpirationDestroy).ifPresent(asyncEventQueueFactory::setForwardExpirationDestroy);
  Optional.ofNullable(this.gatewayEventSubstitutionFilter).ifPresent(asyncEventQueueFactory::setGatewayEventSubstitutionListener);
  Optional.ofNullable(this.maximumQueueMemory).ifPresent(asyncEventQueueFactory::setMaximumQueueMemory);
  Optional.ofNullable(this.persistent).ifPresent(asyncEventQueueFactory::setPersistent);
  asyncEventQueueFactory.setParallel(isParallelEventQueue());
  nullSafeList(this.gatewayEventFilters).forEach(asyncEventQueueFactory::addGatewayEventFilter);
  if (this.orderPolicy != null) {
    Assert.state(isSerialEventQueue(), "OrderPolicy cannot be used with a Parallel AsyncEventQueue");
    asyncEventQueueFactory.setOrderPolicy(this.orderPolicy);
  }
  setAsyncEventQueue(asyncEventQueueFactory.create(getName(), this.asyncEventListener));
}

@Override
protected void doInit() {
  Assert.state(this.asyncEventListener != null, "AsyncEventListener must not be null");
  AsyncEventQueueFactory asyncEventQueueFactory =
    this.factory != null ? (AsyncEventQueueFactory) this.factory : this.cache.createAsyncEventQueueFactory();
  Optional.ofNullable(this.batchConflationEnabled).ifPresent(asyncEventQueueFactory::setBatchConflationEnabled);
  Optional.ofNullable(this.batchSize).ifPresent(asyncEventQueueFactory::setBatchSize);
  Optional.ofNullable(this.batchTimeInterval).ifPresent(asyncEventQueueFactory::setBatchTimeInterval);
  Optional.ofNullable(this.diskStoreReference).ifPresent(asyncEventQueueFactory::setDiskStoreName);
  Optional.ofNullable(this.diskSynchronous).ifPresent(asyncEventQueueFactory::setDiskSynchronous);
  Optional.ofNullable(this.dispatcherThreads).ifPresent(asyncEventQueueFactory::setDispatcherThreads);
  Optional.ofNullable(this.forwardExpirationDestroy).ifPresent(asyncEventQueueFactory::setForwardExpirationDestroy);
  Optional.ofNullable(this.gatewayEventSubstitutionFilter).ifPresent(asyncEventQueueFactory::setGatewayEventSubstitutionListener);
  Optional.ofNullable(this.maximumQueueMemory).ifPresent(asyncEventQueueFactory::setMaximumQueueMemory);
  Optional.ofNullable(this.persistent).ifPresent(asyncEventQueueFactory::setPersistent);
  asyncEventQueueFactory.setParallel(isParallelEventQueue());
  nullSafeList(this.gatewayEventFilters).forEach(asyncEventQueueFactory::addGatewayEventFilter);
  if (this.orderPolicy != null) {
    Assert.state(isSerialEventQueue(), "OrderPolicy cannot be used with a Parallel AsyncEventQueue");
    asyncEventQueueFactory.setOrderPolicy(this.orderPolicy);
  }
  setAsyncEventQueue(asyncEventQueueFactory.create(getName(), this.asyncEventListener));
}

/**
 * @inheritDoc
 */
@Override
protected void doInit() throws Exception {
  GatewayReceiverFactory gatewayReceiverFactory = cache.createGatewayReceiverFactory();
  if (StringUtils.hasText(bindAddress)) {
    gatewayReceiverFactory.setBindAddress(bindAddress);
  }
  if (StringUtils.hasText(hostnameForSenders)) {
    gatewayReceiverFactory.setHostnameForSenders(hostnameForSenders);
  }
  int localStartPort = defaultPort(startPort, GatewayReceiver.DEFAULT_START_PORT);
  int localEndPort = defaultPort(endPort, GatewayReceiver.DEFAULT_END_PORT);
  Assert.isTrue(localStartPort <= localEndPort,
    String.format("'startPort' must be less than or equal to %d.", localEndPort));
  gatewayReceiverFactory.setStartPort(localStartPort);
  gatewayReceiverFactory.setEndPort(localEndPort);
  gatewayReceiverFactory.setManualStart(manualStart);
  if (maximumTimeBetweenPings != null) {
    gatewayReceiverFactory.setMaximumTimeBetweenPings(maximumTimeBetweenPings);
  }
  if (socketBufferSize != null) {
    gatewayReceiverFactory.setSocketBufferSize(socketBufferSize);
  }
  for (GatewayTransportFilter transportFilter : CollectionUtils.nullSafeList(transportFilters)) {
    gatewayReceiverFactory.addGatewayTransportFilter(transportFilter);
  }
  gatewayReceiver = gatewayReceiverFactory.create();
}