Volley源码学习3--log类

VolleyLog工具类

这个类对系统Log做了一些封装，支持release不打印log,而且可以VolleyLog.d(“xxxx”);已经一个d% s%格式的log

package com.android.volley;import android.os.SystemClock;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;/*** Logging helper class.** <p>to see Volley logs call:<br>* {@code <android-sdk>/platform-tools/adb shell setprop log.tag.Volley VERBOSE}*/
public class VolleyLog {public static String TAG = "Volley";public static boolean DEBUG = Log.isLoggable(TAG, Log.VERBOSE);/*** {@link Class#getName()} uses reflection and calling it on a potentially hot code path may* have some cost. To minimize this cost we fetch class name once here and use it later.*/private static final String CLASS_NAME = VolleyLog.class.getName();/*** Customize the log tag for your application, so that other apps using Volley don't mix their* logs with yours. <br>* Enable the log property for your tag before starting your app: <br>* {@code adb shell setprop log.tag.&lt;tag&gt;}*/public static void setTag(String tag) {d("Changing log tag to %s", tag);TAG = tag;// Reinitialize the DEBUG "constant"DEBUG = Log.isLoggable(TAG, Log.VERBOSE);}public static void v(String format, Object... args) {if (DEBUG) {Log.v(TAG, buildMessage(format, args));}}public static void d(String format, Object... args) {Log.d(TAG, buildMessage(format, args));}public static void e(String format, Object... args) {Log.e(TAG, buildMessage(format, args));}public static void e(Throwable tr, String format, Object... args) {Log.e(TAG, buildMessage(format, args), tr);}public static void wtf(String format, Object... args) {Log.wtf(TAG, buildMessage(format, args));}public static void wtf(Throwable tr, String format, Object... args) {Log.wtf(TAG, buildMessage(format, args), tr);}/*** Formats the caller's provided message and prepends useful info like calling thread ID and* method name.*/private static String buildMessage(String format, Object... args) {String msg = (args == null) ? format : String.format(Locale.US, format, args);StackTraceElement[] trace = new Throwable().fillInStackTrace().getStackTrace();String caller = "<unknown>";// Walk up the stack looking for the first caller outside of VolleyLog.// It will be at least two frames up, so start there.for (int i = 2; i < trace.length; i++) {String clazz = trace[i].getClassName();if (!clazz.equals(VolleyLog.CLASS_NAME)) {String callingClass = trace[i].getClassName();callingClass = callingClass.substring(callingClass.lastIndexOf('.') + 1);callingClass = callingClass.substring(callingClass.lastIndexOf('$') + 1);caller = callingClass + "." + trace[i].getMethodName();break;}}return String.format(Locale.US, "[%d] %s: %s", Thread.currentThread().getId(), caller, msg);}/** A simple event log with records containing a name, thread ID, and timestamp. */static class MarkerLog {public static final boolean ENABLED = VolleyLog.DEBUG;/** Minimum duration from first marker to last in an marker log to warrant logging. */private static final long MIN_DURATION_FOR_LOGGING_MS = 0;private static class Marker {public final String name;public final long thread;public final long time;public Marker(String name, long thread, long time) {this.name = name;this.thread = thread;this.time = time;}}private final List<Marker> mMarkers = new ArrayList<>();private boolean mFinished = false;/** Adds a marker to this log with the specified name. */public synchronized void add(String name, long threadId) {if (mFinished) {throw new IllegalStateException("Marker added to finished log");}mMarkers.add(new Marker(name, threadId, SystemClock.elapsedRealtime()));}/*** Closes the log, dumping it to logcat if the time difference between the first and last* markers is greater than {@link #MIN_DURATION_FOR_LOGGING_MS}.** @param header Header string to print above the marker log.*/public synchronized void finish(String header) {mFinished = true;long duration = getTotalDuration();if (duration <= MIN_DURATION_FOR_LOGGING_MS) {return;}long prevTime = mMarkers.get(0).time;d("(%-4d ms) %s", duration, header);for (Marker marker : mMarkers) {long thisTime = marker.time;d("(+%-4d) [%2d] %s", (thisTime - prevTime), marker.thread, marker.name);prevTime = thisTime;}}@Overrideprotected void finalize() throws Throwable {// Catch requests that have been collected (and hence end-of-lifed)// but had no debugging output printed for them.if (!mFinished) {finish("Request on the loose");e("Marker log finalized without finish() - uncaught exit point for request");d("");}}/** Returns the time difference between the first and last events in this log. */private long getTotalDuration() {if (mMarkers.size() == 0) {return 0;}long first = mMarkers.get(0).time;long last = mMarkers.get(mMarkers.size() - 1).time;return last - first;}}
}

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