Add support for asynchronous Rpc (#38)

* Add @AsyncRpc annotation to mark Rpc methods that trigger async events.
* Add `EventCache`, which is the repo of events.
* Add `EventSnippet`, which has Rpc methods for client to poll events.
* Add `SnippetEvent` type to represent an event.
* Add `callbackId` field to Rpc protocol's server resp msg.

2 files changed, 3 insertions, 3 deletions

diff --git a/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/ReflectionSnippetManagerFactory.java b/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/ReflectionSnippetManagerFactory.java
index db90f32..5e4259d 100644
--- a/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/ReflectionSnippetManagerFactory.java
+++ b/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/ReflectionSnippetManagerFactory.java
@@ -19,9 +19,9 @@ package com.google.android.mobly.snippet.manager;
 import android.content.Context;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
-import android.os.Build;
 import android.os.Bundle;
 import com.google.android.mobly.snippet.Snippet;
+import com.google.android.mobly.snippet.event.EventSnippet;
 import com.google.android.mobly.snippet.util.Log;
 import java.util.Collections;
 import java.util.HashMap;
@@ -44,7 +44,6 @@ public class ReflectionSnippetManagerFactory implements SnippetManagerFactory {
 
     @Override
     public SnippetManager create(Integer UID) {
-        int sdkLevel = Build.VERSION.SDK_INT;
         SnippetManager manager = new SnippetManager(mClasses);
         mSnippetManagers.put(UID, manager);
         return manager;
@@ -78,6 +77,8 @@ public class ReflectionSnippetManagerFactory implements SnippetManagerFactory {
         }
         String[] snippetClassNames = snippets.split("\\s*,\\s*");
         Set<Class<? extends Snippet>> receiverSet = new HashSet<>();
+        /** Add the event snippet class which is provided within the Snippet Lib. */
+        receiverSet.add(EventSnippet.class);
         for (String snippetClassName : snippetClassNames) {
             try {
                 Log.i("Trying to load Snippet class: " + snippetClassName);
diff --git a/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/SnippetManager.java b/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/SnippetManager.java
index da5a56d..8944a84 100644
--- a/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/SnippetManager.java
+++ b/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/manager/SnippetManager.java
@@ -98,7 +98,6 @@ public class SnippetManager {
         if (object != null) {
             return object;
         }
-
         Constructor<? extends Snippet> constructor;
         constructor = clazz.getConstructor();
         object = constructor.newInstance();