Hide usage of apolloTracker in apolloClient

Not exposing apolloTracker to the clients. Instead they have to call apolloClient's getRunningCount method and setIdleCallback method which then delegates these calls to the apolloTracker

apollo-idling-resource/src/main/java/com/apollographql/apollo/espresso/ApolloIdlingResource.java

@@ -36,7 +36,7 @@ public static ApolloIdlingResource create(@Nonnull String name, @Nonnull ApolloC
   private ApolloIdlingResource(String name, ApolloClient apolloClient) {
     this.apolloClient = apolloClient;
     this.name = name;
-    apolloClient.apolloCallTracker().setIdleCallback(new Runnable() {
+    apolloClient.setIdleCallback(new Runnable() {
       @Override public void run() {
         ResourceCallback callback = ApolloIdlingResource.this.callback;
         if (callback != null) {
@@ -51,7 +51,7 @@ private ApolloIdlingResource(String name, ApolloClient apolloClient) {
   }
 
   @Override public boolean isIdleNow() {
-    return apolloClient.apolloCallTracker().getRunningCallsCount() == 0;
+    return apolloClient.getRunningCallsCount() == 0;
   }
 
   @Override public void registerIdleTransitionCallback(ResourceCallback callback) {

apollo-runtime/src/main/java/com/apollographql/apollo/ApolloClient.java

@@ -74,7 +74,7 @@ public static Builder builder() {
   private final HttpCacheControl defaultHttpCacheControl;
   private final CacheControl defaultCacheControl;
   private final ApolloLogger logger;
-  private final com.apollographql.apollo.internal.ApolloCallTracker callTracker = new com.apollographql.apollo.internal.ApolloCallTracker();
+  private final ApolloCallTracker callTracker = new ApolloCallTracker();
   private final List<ApolloInterceptor> applicationInterceptors;
 
   private ApolloClient(Builder builder) {
@@ -142,8 +142,12 @@ public ApolloStore apolloStore() {
     return apolloStore;
   }
 
-  public com.apollographql.apollo.internal.ApolloCallTracker apolloCallTracker() {
-    return callTracker;
+  public void setIdleCallback(Runnable idleCallback) {
+    callTracker.setIdleCallback(idleCallback);
+  }
+
+  public int getRunningCallsCount() {
+    return callTracker.getRunningCallsCount();
   }
 
   Response cachedHttpResponse(String cacheKey) throws IOException {
@@ -308,8 +312,8 @@ public Builder logger(@Nullable Logger logger) {
      * after the response source is selected (either the server, cache or both). This method can be called multiple
      * times for adding multiple application interceptors. </p>
      *
-     * <p>Note: Interceptors will be called <b>in the order in which they are added to the list of interceptors</b>
-     * and if any of the interceptors tries to short circuit the responses, then subsequent interceptors <b>won't</b> be
+     * <p>Note: Interceptors will be called <b>in the order in which they are added to the list of interceptors</b> and
+     * if any of the interceptors tries to short circuit the responses, then subsequent interceptors <b>won't</b> be
      * called.</p>
      *
      * @param interceptor Application level interceptor to add

apollo-runtime/src/test/java/com/apollographql/apollo/internal/reader/ApolloCallTrackerTest.java

@@ -63,7 +63,7 @@ public void testAsyncPrefetchInProgress() throws InterruptedException {
       }
     });
 
-    assertThat(apolloClient.apolloCallTracker().getRunningCallsCount()).isEqualTo(0);
+    assertThat(apolloClient.getRunningCallsCount()).isEqualTo(0);
 
     prefetch.enqueue(new ApolloPrefetch.Callback() {
       @Override public void onSuccess() {
@@ -74,7 +74,7 @@ public void testAsyncPrefetchInProgress() throws InterruptedException {
       }
     });
 
-    assertThat(apolloClient.apolloCallTracker().getRunningCallsCount()).isEqualTo(1);
+    assertThat(apolloClient.getRunningCallsCount()).isEqualTo(1);
   }
 
   @Test
@@ -108,7 +108,7 @@ public void testAsyncCallInProgress() {
       }
     });
 
-    assertThat(apolloClient.apolloCallTracker().getRunningCallsCount()).isEqualTo(0);
+    assertThat(apolloClient.getRunningCallsCount()).isEqualTo(0);
 
     apolloCall.enqueue(new ApolloCall.Callback<Object>() {
       @Override public void onResponse(@Nonnull Response<Object> response) {
@@ -120,6 +120,6 @@ public void testAsyncCallInProgress() {
       }
     });
 
-    assertThat(apolloClient.apolloCallTracker().getRunningCallsCount()).isEqualTo(1);
+    assertThat(apolloClient.getRunningCallsCount()).isEqualTo(1);
   }
 }