Android Open Source - wristband-android Volley Log

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License

The source code is released under:

The Artistic License 2.0 Copyright (c) 2014 Allan Pichardo Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed...

Java Source Code

/*
 * Copyright (C) 2011 The Android Open Source Project
 *//w w  w .ja v  a 2  s.c o  m
 * 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. */
public class VolleyLog {
    public static String TAG = "Volley";

    public static boolean DEBUG = Log.isLoggable(TAG, Log.VERBOSE);

    /**
     * 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++) {
            Class<?> clazz = trace[i].getClass();
            if (!clazz.equals(VolleyLog.class)) {
                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<Marker>();
        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;
        }
    }
}

Java Source Code List

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