Package com.launchdarkly.sdk.server

Class Components

java.lang.Object

com.launchdarkly.sdk.server.Components

public abstract class Components
extends java.lang.Object

Provides configurable factories for the standard implementations of LaunchDarkly component interfaces.

Some of the configuration options in LDConfig.Builder affect the entire SDK, but others are specific to one area of functionality, such as how the SDK receives feature flag updates or processes analytics events. For the latter, the standard way to specify a configuration is to call one of the static methods in Components (such as streamingDataSource()), apply any desired configuration change to the object that that method returns (such as StreamingDataSourceBuilder.initialReconnectDelay(java.time.Duration), and then use the corresponding method in LDConfig.Builder (such as LDConfig.Builder.dataSource(DataSourceFactory)) to use that configured component in the SDK.

Since:

4.0.0

Method Summary

Modifier and Type	Method	Description
static DataSourceFactory	externalUpdatesOnly()	Returns a configuration object that disables a direct connection with LaunchDarkly for feature flag updates.
static HttpAuthentication	httpBasicAuthentication(java.lang.String username, java.lang.String password)	Configures HTTP basic authentication, for use with a proxy server.
static HttpConfigurationBuilder	httpConfiguration()	Returns a configuration builder for the SDK's networking configuration.
static DataStoreFactory	inMemoryDataStore()	Returns a configuration object for using the default in-memory implementation of a data store.
static LoggingConfigurationBuilder	logging()	Returns a configuration builder for the SDK's logging configuration.
static EventProcessorFactory	noEvents()	Returns a configuration object that disables analytics events.
static PersistentDataStoreBuilder	persistentDataStore(PersistentDataStoreFactory storeFactory)	Returns a configuration builder for some implementation of a persistent data store.
static PollingDataSourceBuilder	pollingDataSource()	Returns a configurable factory for using polling mode to get feature flag data.
static EventProcessorBuilder	sendEvents()	Returns a configuration builder for analytics event delivery.
static StreamingDataSourceBuilder	streamingDataSource()	Returns a configurable factory for using streaming mode to get feature flag data.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

inMemoryDataStore

public static DataStoreFactory inMemoryDataStore()

Returns a configuration object for using the default in-memory implementation of a data store.

Since it is the default, you do not normally need to call this method, unless you need to create a data store instance for testing purposes.

Returns:

a factory object

Since:

4.12.0

See Also:

LDConfig.Builder.dataStore(DataStoreFactory)

persistentDataStore

public static PersistentDataStoreBuilder persistentDataStore(PersistentDataStoreFactory storeFactory)

Returns a configuration builder for some implementation of a persistent data store.

This method is used in conjunction with another factory object provided by specific components such as the Redis integration. The latter provides builder methods for options that are specific to that integration, while the PersistentDataStoreBuilder provides options that are applicable to any persistent data store (such as caching). For example:

     LDConfig config = new LDConfig.Builder()
         .dataStore(
             Components.persistentDataStore(
                 Redis.dataStore().url("redis://my-redis-host")
             ).cacheSeconds(15)
         )
         .build();
 

See PersistentDataStoreBuilder for more on how this method is used.

For more information on the available persistent data store implementations, see the reference guide on Using a persistent feature store.

Parameters:

storeFactory - the factory/builder for the specific kind of persistent data store

Returns:

a PersistentDataStoreBuilder

Since:

4.12.0

See Also:

LDConfig.Builder.dataStore(DataStoreFactory)

sendEvents

public static EventProcessorBuilder sendEvents()

Returns a configuration builder for analytics event delivery.

The default configuration has events enabled with default settings. If you want to customize this behavior, call this method to obtain a builder, change its properties with the EventProcessorBuilder properties, and pass it to LDConfig.Builder.events(EventProcessorFactory):

     LDConfig config = new LDConfig.Builder()
         .events(Components.sendEvents().capacity(5000).flushIntervalSeconds(2))
         .build();
 

To completely disable sending analytics events, use noEvents() instead.

Setting LDConfig.Builder.offline(boolean) to true will supersede this setting and completely disable network requests.

Returns:

a builder for setting streaming connection properties

Since:

4.12.0

See Also:

noEvents(), LDConfig.Builder.events(com.launchdarkly.sdk.server.interfaces.EventProcessorFactory)

noEvents

public static EventProcessorFactory noEvents()

Returns a configuration object that disables analytics events.

Passing this to LDConfig.Builder.events(EventProcessorFactory) causes the SDK to discard all analytics events and not send them to LaunchDarkly, regardless of any other configuration.

     LDConfig config = new LDConfig.Builder()
         .events(Components.noEvents())
         .build();
 

Returns:

a factory object

Since:

4.12.0

See Also:

sendEvents(), LDConfig.Builder.events(EventProcessorFactory)

streamingDataSource

public static StreamingDataSourceBuilder streamingDataSource()

Returns a configurable factory for using streaming mode to get feature flag data.

By default, the SDK uses a streaming connection to receive feature flag data from LaunchDarkly. To use the default behavior, you do not need to call this method. However, if you want to customize the behavior of the connection, call this method to obtain a builder, change its properties with the StreamingDataSourceBuilder methods, and pass it to LDConfig.Builder.dataSource(DataSourceFactory):

 
     LDConfig config = new LDConfig.Builder()
         .dataSource(Components.streamingDataSource().initialReconnectDelayMillis(500))
         .build();
 

Setting LDConfig.Builder.offline(boolean) to true will supersede this setting and completely disable network requests.

Returns:

a builder for setting streaming connection properties

Since:

4.12.0

See Also:

LDConfig.Builder.dataSource(DataSourceFactory)

pollingDataSource

public static PollingDataSourceBuilder pollingDataSource()

Returns a configurable factory for using polling mode to get feature flag data.

This is not the default behavior; by default, the SDK uses a streaming connection to receive feature flag data from LaunchDarkly. In polling mode, the SDK instead makes a new HTTP request to LaunchDarkly at regular intervals. HTTP caching allows it to avoid redundantly downloading data if there have been no changes, but polling is still less efficient than streaming and should only be used on the advice of LaunchDarkly support.

To use polling mode, call this method to obtain a builder, change its properties with the PollingDataSourceBuilder methods, and pass it to LDConfig.Builder.dataSource(DataSourceFactory):

     LDConfig config = new LDConfig.Builder()
         .dataSource(Components.pollingDataSource().pollIntervalMillis(45000))
         .build();
 

Setting LDConfig.Builder.offline(boolean) to true will supersede this setting and completely disable network requests.

Returns:

a builder for setting polling properties

Since:

4.12.0

See Also:

LDConfig.Builder.dataSource(DataSourceFactory)

externalUpdatesOnly

public static DataSourceFactory externalUpdatesOnly()

Returns a configuration object that disables a direct connection with LaunchDarkly for feature flag updates.

Passing this to LDConfig.Builder.dataSource(DataSourceFactory) causes the SDK not to retrieve feature flag data from LaunchDarkly, regardless of any other configuration. This is normally done if you are using the Relay Proxy in "daemon mode", where an external process-- the Relay Proxy-- connects to LaunchDarkly and populates a persistent data store with the feature flag data. The data store could also be populated by another process that is running the LaunchDarkly SDK. If there is no external process updating the data store, then the SDK will not have any feature flag data and will return application default values only.

     LDConfig config = new LDConfig.Builder()
         .dataSource(Components.externalUpdatesOnly())
         .dataStore(Components.persistentDataStore(Redis.dataStore())) // assuming the Relay Proxy is using Redis
         .build();
 

(Note that the interface is still named DataSourceFactory, but in a future version it will be renamed to DataSourceFactory.)

Returns:

a factory object

Since:

4.12.0

See Also:

LDConfig.Builder.dataSource(DataSourceFactory)

httpConfiguration

public static HttpConfigurationBuilder httpConfiguration()

Returns a configuration builder for the SDK's networking configuration.

Passing this to LDConfig.Builder.http(com.launchdarkly.sdk.server.interfaces.HttpConfigurationFactory) applies this configuration to all HTTP/HTTPS requests made by the SDK.

     LDConfig config = new LDConfig.Builder()
         .http(
              Components.httpConfiguration()
                  .connectTimeoutMillis(3000)
                  .proxyHostAndPort("my-proxy", 8080)
         )
         .build();
 

Returns:

a factory object

Since:

4.13.0

See Also:

LDConfig.Builder.http(com.launchdarkly.sdk.server.interfaces.HttpConfigurationFactory)

httpBasicAuthentication

public static HttpAuthentication httpBasicAuthentication(java.lang.String username, java.lang.String password)

Configures HTTP basic authentication, for use with a proxy server.

     LDConfig config = new LDConfig.Builder()
         .http(
              Components.httpConfiguration()
                  .proxyHostAndPort("my-proxy", 8080)
                  .proxyAuthentication(Components.httpBasicAuthentication("username", "password"))
         )
         .build();
 

Parameters:

username - the username

password - the password

Returns:

the basic authentication strategy

Since:

4.13.0

See Also:

HttpConfigurationBuilder.proxyAuth(HttpAuthentication)

logging

public static LoggingConfigurationBuilder logging()

Returns a configuration builder for the SDK's logging configuration.

Passing this to LDConfig.Builder.logging(com.launchdarkly.sdk.server.interfaces.LoggingConfigurationFactory), after setting any desired properties on the builder, applies this configuration to the SDK.

     LDConfig config = new LDConfig.Builder()
         .logging(
              Components.logging()
                  .logDataSourceOutageAsErrorAfter(Duration.ofSeconds(120))
         )
         .build();
 

Returns:

a factory object

Since:

5.0.0

See Also:

LDConfig.Builder.logging(com.launchdarkly.sdk.server.interfaces.LoggingConfigurationFactory)