Initial checkin of AOSP Messaging app.

b/23110861

Change-Id: I9aa980d7569247d6b2ca78f5dcb4502e1eaadb8a

src/com/android/messaging/util/LoggingTimer.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2015 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.messaging.util;
+
+import android.os.SystemClock;
+
+/**
+ * A utility timer that logs the execution time of operations
+ */
+public class LoggingTimer {
+    private static final int NO_WARN_LIMIT = -1;
+
+    private final String mTag;
+    private final String mName;
+    private final long mWarnLimitMillis;
+    private long mStartMillis;
+
+    public LoggingTimer(final String tag, final String name) {
+        this(tag, name, NO_WARN_LIMIT);
+    }
+
+    public LoggingTimer(final String tag, final String name, final long warnLimitMillis) {
+        mTag = tag;
+        mName = name;
+        mWarnLimitMillis = warnLimitMillis;
+    }
+
+    /**
+     * This method should be called at the start of the operation to be timed.
+     */
+    public void start() {
+        mStartMillis = SystemClock.elapsedRealtime();
+
+        if (LogUtil.isLoggable(mTag, LogUtil.VERBOSE)) {
+            LogUtil.v(mTag, "Timer start for " + mName);
+        }
+    }
+
+    /**
+     * This method should be called at the end of the operation to be timed. It logs the time since
+     * the last call to {@link #start}
+     */
+    public void stopAndLog() {
+        final long elapsedMs = SystemClock.elapsedRealtime() - mStartMillis;
+
+        final String logMessage = String.format("Used %dms for %s", elapsedMs, mName);
+
+        LogUtil.save(LogUtil.DEBUG, mTag, logMessage);
+
+        if (mWarnLimitMillis != NO_WARN_LIMIT && elapsedMs > mWarnLimitMillis) {
+            LogUtil.w(mTag, logMessage);
+        } else if (LogUtil.isLoggable(mTag, LogUtil.VERBOSE)) {
+            LogUtil.v(mTag, logMessage);
+        }
+    }
+}