Make ServiceCall Future-like

client-runtime/src/main/java/com/microsoft/rest/ServiceCall.java

@@ -7,14 +7,18 @@
 
 package com.microsoft.rest;
 
+import com.google.common.util.concurrent.AbstractFuture;
+
 import retrofit2.Call;
 
 /**
  * An instance of this class provides access to the underlying REST call invocation.
  * This class wraps around the Retrofit Call object and allows updates to it in the
  * progress of a long running operation or a paging operation.
+ *
+ * @param <T> the type of the returning object
  */
-public class ServiceCall {
+public class ServiceCall<T> extends AbstractFuture<T> {
     /**
      * The Retrofit method invocation.
      */
@@ -62,4 +66,26 @@ public void cancel() {
     public boolean isCanceled() {
         return call.isCanceled();
     }
+
+    /**
+     * Invoke this method to report completed, allowing
+     * {@link AbstractFuture#get()} to be unblocked.
+     *
+     * @param result the object returned.
+     * @return true if successfully reported; false otherwise.
+     */
+    public boolean success(T result) {
+        return set(result);
+    }
+
+    /**
+     * Invoke this method to report a failure, allowing
+     * {@link AbstractFuture#get()} to throw the exception.
+     *
+     * @param t the exception thrown.
+     * @return true if successfully reported; false otherwise.
+     */
+    public boolean failure(Throwable t) {
+        return setException(t);
+    }
 }