Add an offline mode that never talks to a remote server

src/main/java/com/launchdarkly/client/LDClient.java

@@ -42,6 +42,7 @@ public class LDClient implements Closeable {
  private final EventProcessor eventProcessor;
  private final String apiKey;
  protected static final String CLIENT_VERSION = getClientVersion();
+ private volatile boolean offline = false;
 
 
  /**
@@ -117,6 +118,9 @@ public void sendEvent(String eventName, LDUser user, JsonObject data) {
  * @param user the user that performed the event
  */
  public void sendEvent(String eventName, LDUser user) {
+ if (this.offline) {
+ return;
+ }
  sendEvent(eventName, user, null);
  }
 
@@ -138,6 +142,10 @@ private void sendFlagRequestEvent(String featureKey, LDUser user, boolean value)
  * @return whether or not the flag should be enabled, or {@code defaultValue} if the flag is disabled in the LaunchDarkly control panel
  */
  public boolean getFlag(String featureKey, LDUser user, boolean defaultValue) {
+ if (this.offline) {
+ return defaultValue;
+ }
+
  Gson gson = new Gson();
  HttpCacheContext context = HttpCacheContext.create();
  HttpGet request = config.getRequest(apiKey, "/api/eval/features/" + featureKey);
@@ -220,6 +228,32 @@ public void close() throws IOException {
  }
 
 
+ /**
+ * Puts the LaunchDarkly client in offline mode.
+ * In offline mode, all calls to {@link #getFlag(String, LDUser, boolean)} will return the default value, and
+ * {@link #sendEvent(String, LDUser, com.google.gson.JsonObject)} will be a no-op.
+ *
+ */
+ public void setOffline() {
+ this.offline = true;
+ }
+
+ /**
+ * Puts the LaunchDarkly client in online mode.
+ *
+ */
+ public void setOnline() {
+ this.offline = false;
+ }
+
+ /**
+ *
+ * @return whether the client is in offline mode
+ */
+ public boolean isOffline() {
+ return this.offline;
+ }
+
  private static String getClientVersion() {
  Class clazz = LDConfig.class;
  String className = clazz.getSimpleName() + ".class";