diff options
Diffstat (limited to 'core/src/main/java/com/android/volley/VolleyLog.java')
| -rw-r--r-- | core/src/main/java/com/android/volley/VolleyLog.java | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/core/src/main/java/com/android/volley/VolleyLog.java b/core/src/main/java/com/android/volley/VolleyLog.java new file mode 100644 index 0000000..8477668 --- /dev/null +++ b/core/src/main/java/com/android/volley/VolleyLog.java @@ -0,0 +1,182 @@ +/* + * Copyright (C) 2011 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.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.<tag>} + */ + 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; + } + } + + @Override + protected 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"); + } + } + + /** 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; + } + } +} |