116 lines
4.3 KiB
Java
116 lines
4.3 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.messaging.util;
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import android.annotation.TargetApi;
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import android.os.Build;
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/**
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* Helper class for systrace (see http://developer.android.com/tools/help/systrace.html).<p>
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* To enable, set log.tag.Bugle_Trace (defined by {@link #TAG} to VERBOSE before
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* the process starts.<p>
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* Note that this will run only on JBMR2 or later; on earlier platforms or if the log
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* tag isn't set, calls to {@link #beginSection(String)} or {@link #endSection()} are no-ops. <p>
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* Internally, calls dispatch to either a class that actually does work or a class that doesn't.
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* This avoids Dalvik complaining when it loads the class on earlier platforms that the
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* opcodes aren't available, and, according to the Dalvik team, using vtable dispatching for
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* something like this should be faster than if (OsUtil.isAtLeast...()) on each call.
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*/
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public final class Trace {
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private static final String TAG = "Bugle_Trace";
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private abstract static class AbstractTrace {
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abstract void beginSection(String sectionName);
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abstract void endSection();
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}
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private static final AbstractTrace sTrace;
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// Static initializer to pick the correct trace class to handle tracing.
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static {
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// Use android.util.Log instead of LogUtil here to avoid pulling in Gservices
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// too early in app startup.
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if (OsUtil.isAtLeastJB_MR2() &&
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android.util.Log.isLoggable(TAG, android.util.Log.VERBOSE)) {
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sTrace = new TraceJBMR2();
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} else {
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sTrace = new TraceShim();
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}
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}
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/**
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* Writes a trace message to indicate that a given section of code has begun. This call must
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* be followed by a corresponding call to {@link #endSection()} on the same thread.
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*
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* <p class="note"> At this time the vertical bar character '|', newline character '\n', and
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* null character '\0' are used internally by the tracing mechanism. If sectionName contains
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* these characters they will be replaced with a space character in the trace.
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*
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* @param sectionName The name of the code section to appear in the trace. This may be at
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* most 127 Unicode code units long.
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*/
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public static void beginSection(String sectionName) {
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if (LogUtil.isLoggable(TAG, LogUtil.VERBOSE)) {
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LogUtil.v(TAG, "beginSection() " + sectionName);
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}
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sTrace.beginSection(sectionName);
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}
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/**
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* Writes a trace message to indicate that a given section of code has ended. This call must
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* be preceeded by a corresponding call to {@link #beginSection(String)}. Calling this method
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* will mark the end of the most recently begun section of code, so care must be taken to
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* ensure that beginSection / endSection pairs are properly nested and called from the same
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* thread.
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*/
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public static void endSection() {
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sTrace.endSection();
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if (LogUtil.isLoggable(TAG, LogUtil.VERBOSE)) {
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LogUtil.v(TAG, "endSection()");
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}
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}
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/**
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* Internal class that we use if we really did enable tracing.
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*/
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@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
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private static final class TraceJBMR2 extends AbstractTrace {
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@Override
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void beginSection(String sectionName) {
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android.os.Trace.beginSection(sectionName);
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}
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@Override
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void endSection() {
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android.os.Trace.endSection();
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}
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}
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/**
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* Dummy class that we use if we aren't really tracing.
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*/
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private static final class TraceShim extends AbstractTrace {
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@Override
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void beginSection(String sectionName) {
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}
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@Override
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void endSection() {
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}
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}
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}
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