Merge "Adds ERROR state to ImsConfig"
diff --git a/telephony/java/com/android/ims/ImsConfig.java b/telephony/java/com/android/ims/ImsConfig.java
index e7b22bd..cf4c47b 100644
--- a/telephony/java/com/android/ims/ImsConfig.java
+++ b/telephony/java/com/android/ims/ImsConfig.java
@@ -524,6 +524,7 @@
* Defines IMS feature value.
*/
public static class FeatureValueConstants {
+ public static final int ERROR = -1;
public static final int OFF = 0;
public static final int ON = 1;
}
diff --git a/telephony/java/com/android/internal/telephony/ExponentialBackoff.java b/telephony/java/com/android/internal/telephony/ExponentialBackoff.java
new file mode 100644
index 0000000..80958c0
--- /dev/null
+++ b/telephony/java/com/android/internal/telephony/ExponentialBackoff.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2017 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.internal.telephony;
+
+import android.annotation.NonNull;
+import android.os.Handler;
+import android.os.Looper;
+
+/** The implementation of exponential backoff with jitter applied. */
+public class ExponentialBackoff {
+ private int mRetryCounter;
+ private long mStartDelayMs;
+ private long mMaximumDelayMs;
+ private long mCurrentDelayMs;
+ private int mMultiplier;
+ private Runnable mRunnable;
+ private Handler mHandler;
+
+ public ExponentialBackoff(
+ long initialDelayMs,
+ long maximumDelayMs,
+ int multiplier,
+ @NonNull Looper looper,
+ @NonNull Runnable runnable) {
+ this(initialDelayMs, maximumDelayMs, multiplier, new Handler(looper), runnable);
+ }
+
+ public ExponentialBackoff(
+ long initialDelayMs,
+ long maximumDelayMs,
+ int multiplier,
+ @NonNull Handler handler,
+ @NonNull Runnable runnable) {
+ mRetryCounter = 0;
+ mStartDelayMs = initialDelayMs;
+ mMaximumDelayMs = maximumDelayMs;
+ mMultiplier = multiplier;
+ mHandler = handler;
+ mRunnable = runnable;
+ }
+
+ /** Starts the backoff, the runnable will be executed after {@link #mStartDelayMs}. */
+ public void start() {
+ mRetryCounter = 0;
+ mCurrentDelayMs = mStartDelayMs;
+ mHandler.removeCallbacks(mRunnable);
+ mHandler.postDelayed(mRunnable, mCurrentDelayMs);
+ }
+
+ /** Stops the backoff, all pending messages will be removed from the message queue. */
+ public void stop() {
+ mRetryCounter = 0;
+ mHandler.removeCallbacks(mRunnable);
+ }
+
+ /** Should call when the retry action has failed and we want to retry after a longer delay. */
+ public void notifyFailed() {
+ mRetryCounter++;
+ long temp = Math.min(
+ mMaximumDelayMs, (long) (mStartDelayMs * Math.pow(mMultiplier, mRetryCounter)));
+ mCurrentDelayMs = (long) (((1 + Math.random()) / 2) * temp);
+ mHandler.removeCallbacks(mRunnable);
+ mHandler.postDelayed(mRunnable, mCurrentDelayMs);
+ }
+
+ /** Returns the delay for the most recently posted message. */
+ public long getCurrentDelay() {
+ return mCurrentDelayMs;
+ }
+}