Added executor framework to sync prod and tests

+ Use a TestableExecutor in the production code to allow tests to
sync up and block so the state of the system can be tested. In the
tests the executor can wait until the production code hits a
milestone to ensure that the system is in a proper state for testing.

+ The current implementation only attempts to synchronize between one
production thread and one test thread. Extend the TestableExecutor
interface to perform additional synchronization.

Change-Id: Ie6fc64392e402330ab66c6f2cd0ec22200ebbdea

1 files changed, 61 insertions, 0 deletions

diff --git a/InCallUI/tests/src/com/android/incallui/async/SingleProdThreadExecutor.java b/InCallUI/tests/src/com/android/incallui/async/SingleProdThreadExecutor.java
new file mode 100644
index 000000000..ee27862b3
--- /dev/null
+++ b/InCallUI/tests/src/com/android/incallui/async/SingleProdThreadExecutor.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.incallui.async;
+
+import java.util.concurrent.Executors;
+
+import javax.annotation.concurrent.ThreadSafe;
+
+/**
+ * {@link PausableExecutor} for use in tests. It is intended to be used between one test thread
+ * and one prod thread.
+ */
+@ThreadSafe
+public final class SingleProdThreadExecutor implements PausableExecutor {
+
+    private int mMilestonesReached;
+    private int mMilestonesAcked;
+
+    @Override
+    public synchronized void milestone() {
+        ++mMilestonesReached;
+        notify();
+        while (mMilestonesReached > mMilestonesAcked) {
+            try {
+                wait();
+            } catch (InterruptedException e) {}
+        }
+    }
+
+    @Override
+    public synchronized void ackMilestoneForTesting() {
+        ++mMilestonesAcked;
+        notify();
+    }
+
+    @Override
+    public synchronized void awaitMilestoneForTesting() throws InterruptedException {
+        while (mMilestonesReached <= mMilestonesAcked) {
+            wait();
+        }
+    }
+
+    @Override
+    public synchronized void execute(Runnable command) {
+        Executors.newSingleThreadExecutor().execute(command);
+    }
+}