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/*
* Copyright (C) 2019 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.launcher3.logging;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.Locale;
/**
* A utility class to record and log events. Events are stored in a fixed size array and old logs
* are purged as new events come.
*/
public class EventLogArray {
private static final int TYPE_ONE_OFF = 0;
private static final int TYPE_FLOAT = 1;
private static final int TYPE_INTEGER = 2;
private static final int TYPE_BOOL_TRUE = 3;
private static final int TYPE_BOOL_FALSE = 4;
private final String name;
private final EventEntry[] logs;
private int nextIndex;
public EventLogArray(String name, int size) {
this.name = name;
logs = new EventEntry[size];
nextIndex = 0;
}
public void addLog(String event) {
addLog(TYPE_ONE_OFF, event, 0);
}
public void addLog(String event, int extras) {
addLog(TYPE_INTEGER, event, extras);
}
public void addLog(String event, float extras) {
addLog(TYPE_FLOAT, event, extras);
}
public void addLog(String event, boolean extras) {
addLog(extras ? TYPE_BOOL_TRUE : TYPE_BOOL_FALSE, event, 0);
}
private void addLog(int type, String event, float extras) {
// Merge the logs if its a duplicate
int last = (nextIndex + logs.length - 1) % logs.length;
int secondLast = (nextIndex + logs.length - 2) % logs.length;
if (isEntrySame(logs[last], type, event) && isEntrySame(logs[secondLast], type, event)) {
logs[last].update(type, event, extras);
logs[secondLast].duplicateCount++;
return;
}
if (logs[nextIndex] == null) {
logs[nextIndex] = new EventEntry();
}
logs[nextIndex].update(type, event, extras);
nextIndex = (nextIndex + 1) % logs.length;
}
public void clear() {
Arrays.setAll(logs, (i) -> null);
}
public void dump(String prefix, PrintWriter writer) {
writer.println(prefix + "EventLog (" + name + ") history:");
SimpleDateFormat sdf = new SimpleDateFormat(" HH:mm:ss.SSSZ ", Locale.US);
Date date = new Date();
for (int i = 0; i < logs.length; i++) {
EventEntry log = logs[(nextIndex + logs.length - i - 1) % logs.length];
if (log == null) {
continue;
}
date.setTime(log.time);
StringBuilder msg = new StringBuilder(prefix).append(sdf.format(date))
.append(log.event);
switch (log.type) {
case TYPE_BOOL_FALSE:
msg.append(": false");
break;
case TYPE_BOOL_TRUE:
msg.append(": true");
break;
case TYPE_FLOAT:
msg.append(": ").append(log.extras);
break;
case TYPE_INTEGER:
msg.append(": ").append((int) log.extras);
break;
default: // fall out
}
if (log.duplicateCount > 0) {
msg.append(" & ").append(log.duplicateCount).append(" similar events");
}
writer.println(msg);
}
}
private boolean isEntrySame(EventEntry entry, int type, String event) {
return entry != null && entry.type == type && entry.event.equals(event);
}
/** A single event entry. */
private static class EventEntry {
private int type;
private String event;
private float extras;
private long time;
private int duplicateCount;
public void update(int type, String event, float extras) {
this.type = type;
this.event = event;
this.extras = extras;
time = System.currentTimeMillis();
duplicateCount = 0;
}
}
}
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