| /* |
| * 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 android.support.v4.os; |
| |
| import android.os.Build; |
| |
| /** |
| * Writes trace events to the system trace buffer. These trace events can be |
| * collected and visualized using the Systrace tool. |
| * |
| * <p>This tracing mechanism is independent of the method tracing mechanism |
| * offered by {@link android.os.Debug#startMethodTracing}. In particular, it enables |
| * tracing of events that occur across multiple processes. |
| * <p>For information about using the Systrace tool, read <a |
| * href="{@docRoot}tools/debugging/systrace.html">Analyzing Display and Performance |
| * with Systrace</a>. |
| */ |
| public class TraceCompat { |
| /** |
| * Writes a trace message to indicate that a given section of code has begun. This call must |
| * be followed by a corresponding call to {@link #endSection()} on the same thread. |
| * |
| * <p class="note"> At this time the vertical bar character '|', newline character '\n', and |
| * null character '\0' are used internally by the tracing mechanism. If sectionName contains |
| * these characters they will be replaced with a space character in the trace. |
| * |
| * @param sectionName The name of the code section to appear in the trace. This may be at |
| * most 127 Unicode code units long. |
| */ |
| |
| public static void beginSection(String sectionName) { |
| if (Build.VERSION.SDK_INT >= 18) { |
| TraceJellybeanMR2.beginSection(sectionName); |
| } |
| } |
| |
| /** |
| * Writes a trace message to indicate that a given section of code has ended. This call must |
| * be preceeded by a corresponding call to {@link #beginSection(String)}. Calling this method |
| * will mark the end of the most recently begun section of code, so care must be taken to |
| * ensure that beginSection / endSection pairs are properly nested and called from the same |
| * thread. |
| */ |
| public static void endSection() { |
| if (Build.VERSION.SDK_INT >= 18) { |
| TraceJellybeanMR2.endSection(); |
| } |
| } |
| } |