Package io.unlaunch

Class OfflineUnlaunchClient

java.lang.Object
io.unlaunch.OfflineUnlaunchClient
All Implemented Interfaces:
UnlaunchClient, java.lang.Cloneable
public class OfflineUnlaunchClient
extends java.lang.Object
implements UnlaunchClient
Offline Unlaunch client which doesn't connect to the Unlauch server over network to download feature flags, nor does it sends any events or metrics data. By default, it will return default variation for all feature flags. Users can specify a YAML file containing feature flags and default variations and it will return those when the feature is evaluated.
Author:
umermansoor

  • Constructor Summary

    Constructors 
    Constructor Description
    OfflineUnlaunchClient()  
    OfflineUnlaunchClient​(java.lang.String yamlFilePath)  

  • Method Summary

    Modifier and Type Method Description
    AccountDetails accountDetails()
    Returns account details for the Unlaunch project and environment the client is connected to.
    void awaitUntilReady​(long timeout, java.util.concurrent.TimeUnit unit)
    Causes the current thread to wait until UnlaunchClient is initialized, unless the thread is interrupted, or the specified waiting time elapses.
    UnlaunchFeature getFeature​(java.lang.String flagKey, java.lang.String identity)
    Same as UnlaunchClient.getVariation(String, String) but returns a UnlaunchFeature object that contains the evaluated variation (variation key) and any configuration (key, value properties or JSON) associated with the evaluated variation, defined in the Unlaunch web console.
    UnlaunchFeature getFeature​(java.lang.String flagKey, java.lang.String identity, UnlaunchAttribute... attributes)
    Same as UnlaunchClient.getFeature(String, String) but uses attributes that are passed as argument when evaluating the feature flag's targeting rules.
    java.lang.String getVariation​(java.lang.String flagKey, java.lang.String identity)
    Evaluates and returns the variation (variation key) for this feature.
    java.lang.String getVariation​(java.lang.String flagKey, java.lang.String identity, UnlaunchAttribute... attributes)
    Same as UnlaunchClient.getVariation(String, String) but uses attributes that are passed as argument when evaluating the feature flag's targeting rules.
    boolean isReady()
    Returns true is the client is intialized and ready.
    void shutdown()
    Closes the client by cleaning up all resources such as in memory caches, etc., stops running tasks and rejects any new requests which arrive after this method is called.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

  • Method Details

    • accountDetails

      public AccountDetails accountDetails()
      Description copied from interface: UnlaunchClient
      Returns account details for the Unlaunch project and environment the client is connected to.
      Specified by:
      accountDetails in interface UnlaunchClient
      Returns:
      AccountDetails

    • getVariation

      public java.lang.String getVariation​(java.lang.String flagKey, java.lang.String identity)
      Description copied from interface: UnlaunchClient
      Evaluates and returns the variation (variation key) for this feature. Variations are defined using the Unlaunch Console at https://app.unlaunch.io.

      This method returns "control" if:

      1. The flag was not found.
      2. There was an exception evaluation the feature flag.
      3. The flag was archived.

      This method doesn't throw any exceptions nor does it return null value

      Specified by:
      getVariation in interface UnlaunchClient
      Parameters:
      flagKey - the feature flag you want to evaluate.
      identity - unique id of your user or a unique identifier such as request or session id, email, etc. It may be null but 'Percentage rollout' will not work because it is used to determine bucketing. If this is null and 'Percentge rollout' is enabled, we'll log exceptions in your code and also in the Unlaunch web app.
      Returns:
      the evaluated variation or "control" if there was an error.

    • getVariation

      public java.lang.String getVariation​(java.lang.String flagKey, java.lang.String identity, UnlaunchAttribute... attributes)
      Description copied from interface: UnlaunchClient
      Same as UnlaunchClient.getVariation(String, String) but uses attributes that are passed as argument when evaluating the feature flag's targeting rules. Targeting rules are defined on the Unlaunch web console. To understand attributes, suppose you have defined a feature flag with targeting rules to return certain variation based on user's country e.g. 
            if country is "USA" AND subscriber is true
          return "on"
      otherwise
          return "off"
      In this example, country will be subscriber are attributes that must be passed in. If the user is from USA and is subscriber, the "on" variation will be returned. Otherwise, "off". 
        client.getFeature(
     "show_bonus_pack",
     userId,
     UnlaunchAttribute.newString("country", "USA"),
     UnlaunchAttribute.newBoolean("sbscriber", true)
  );

      This method doesn't throw any exceptions nor does it return null value

      Specified by:
      getVariation in interface UnlaunchClient
      Parameters:
      flagKey - the feature flag you want to evaluate.
      identity - unique id of your user or a unique identifier such as request or session id, email, etc. It * may be null but 'Percentage rollout' will not work because it is used to determine bucketing. * If this is null and 'Percentge rollout' is enabled, we'll log exceptions in your code and also * in the Unlaunch web app.
      attributes - attributes to apply when evaluating target rules.
      Returns:
      the evaluated variation or "control" if there was an error.

    • getFeature

      public UnlaunchFeature getFeature​(java.lang.String flagKey, java.lang.String identity)
      Description copied from interface: UnlaunchClient
      Same as UnlaunchClient.getVariation(String, String) but returns a UnlaunchFeature object that contains the evaluated variation (variation key) and any configuration (key, value properties or JSON) associated with the evaluated variation, defined in the Unlaunch web console. For example, to get dynamic configuration associated with a variation, you can: 
            UnlaunchFeature feature = client.getFeature("new_login_ui", userId);
      String colorHexCode = feature.getVariationConfig().getString("login_button_color", "#cd5c5c");

      renderButton(colorHexCode);
      Specified by:
      getFeature in interface UnlaunchClient
      Parameters:
      flagKey - the feature flag you want to evaluate.
      identity - unique id of your user or a unique identifier such as request or session id, email, etc. It may be null but 'Percentage rollout' will not work because it is used to determine bucketing.
      Returns:
      UnlaunchFeature object that contains evaluated variation key, configuration and evaluation reason.

    • getFeature

      public UnlaunchFeature getFeature​(java.lang.String flagKey, java.lang.String identity, UnlaunchAttribute... attributes)
      Description copied from interface: UnlaunchClient
      Same as UnlaunchClient.getFeature(String, String) but uses attributes that are passed as argument when evaluating the feature flag's targeting rules. Targeting rules are defined on the Unlaunch web console. To understand attributes, suppose you have defined a feature flag with targeting rules to return certain variation based on user's country e.g. 
            if user's country is "USA" AND device is "handheld"
          return "on"
      otherwise
          return "off"
      In this example, country will be device are attributes that must be passed in.
      Specified by:
      getFeature in interface UnlaunchClient
      Parameters:
      flagKey - the feature flag you want to evaluate.
      identity - unique id of your user or a unique identifier such as request or session id, email, etc. It may be null but 'Percentage rollout' will not work because it is used to determine bucketing.
      attributes - an array of attributes to evaluate against
      Returns:
      UnlaunchFeature object that contains evaluated variation key, configuration and evaluation reason.

    • awaitUntilReady

      public void awaitUntilReady​(long timeout, java.util.concurrent.TimeUnit unit) throws java.lang.InterruptedException, java.util.concurrent.TimeoutException
      Description copied from interface: UnlaunchClient
      Causes the current thread to wait until UnlaunchClient is initialized, unless the thread is interrupted, or the specified waiting time elapses.

      If the current thread:

      • has its interrupted status set on entry to this method; or
      • is interrupted while waiting,

      then InterruptedException is thrown and the current thread's interrupted status is cleared.

      Specified by:
      awaitUntilReady in interface UnlaunchClient
      Parameters:
      timeout - the maximum time to wait
      unit - the time unit of the timeout argument
      Throws:
      java.lang.InterruptedException - if the current thread is interrupted while waiting
      java.util.concurrent.TimeoutException - if it times out before initialization is complete

    • isReady

      public boolean isReady()
      Description copied from interface: UnlaunchClient
      Returns true is the client is intialized and ready. False otherwise.

      Initialized means that the client was able to download flags and data from the Unlaunch server at leasr once.

      Specified by:
      isReady in interface UnlaunchClient
      Returns:

    • shutdown

      public void shutdown()
      Description copied from interface: UnlaunchClient
      Closes the client by cleaning up all resources such as in memory caches, etc., stops running tasks and rejects any new requests which arrive after this method is called.

      The default behavior of this method is to block until everything has been shutdown or it encountered an error or timed out (usually a few seconds.)

      Specified by:
      shutdown in interface UnlaunchClient