public void testStatsBucketResize() throws Exception {
NetworkStatsHistory history = null;
assertStatsFilesExist(false);
// pretend that wifi network comes online; service should ask about full
// network state, and poll any existing interfaces before updating.
expectCurrentTime();
expectSettings(0L, HOUR_IN_MILLIS, WEEK_IN_MILLIS);
expectNetworkState(buildWifiState());
expectNetworkStatsSummary(buildEmptyStats());
expectNetworkStatsUidDetail(buildEmptyStats());
expectNetworkStatsPoll();
replay();
mServiceContext.sendBroadcast(new Intent(CONNECTIVITY_ACTION_IMMEDIATE));
verifyAndReset();
// modify some number on wifi, and trigger poll event
incrementCurrentTime(2 * HOUR_IN_MILLIS);
expectCurrentTime();
expectSettings(0L, HOUR_IN_MILLIS, WEEK_IN_MILLIS);
expectNetworkStatsSummary(
new NetworkStats(getElapsedRealtime(), 1).addIfaceValues(TEST_IFACE, 512L, 4L, 512L, 4L));
expectNetworkStatsUidDetail(buildEmptyStats());
expectNetworkStatsPoll();
replay();
mServiceContext.sendBroadcast(new Intent(ACTION_NETWORK_STATS_POLL));
// verify service recorded history
history = mService.getHistoryForNetwork(sTemplateWifi, FIELD_ALL);
assertValues(history, Long.MIN_VALUE, Long.MAX_VALUE, 512L, 4L, 512L, 4L, 0);
assertEquals(HOUR_IN_MILLIS, history.getBucketDuration());
assertEquals(2, history.size());
verifyAndReset();
// now change bucket duration setting and trigger another poll with
// exact same values, which should resize existing buckets.
expectCurrentTime();
expectSettings(0L, 30 * MINUTE_IN_MILLIS, WEEK_IN_MILLIS);
expectNetworkStatsSummary(buildEmptyStats());
expectNetworkStatsUidDetail(buildEmptyStats());
expectNetworkStatsPoll();
replay();
mServiceContext.sendBroadcast(new Intent(ACTION_NETWORK_STATS_POLL));
// verify identical stats, but spread across 4 buckets now
history = mService.getHistoryForNetwork(sTemplateWifi, FIELD_ALL);
assertValues(history, Long.MIN_VALUE, Long.MAX_VALUE, 512L, 4L, 512L, 4L, 0);
assertEquals(30 * MINUTE_IN_MILLIS, history.getBucketDuration());
assertEquals(4, history.size());
verifyAndReset();
}
/**
* Erase any existing {@link Path} and generate series outline based on currently bound {@link
* NetworkStatsHistory} data.
*/
private void generatePath() {
if (LOGD) Log.d(TAG, "generatePath()");
mMax = 0;
mPathStroke.reset();
mPathFill.reset();
mPathEstimate.reset();
mPathValid = true;
// bail when not enough stats to render
if (mStats == null || mStats.size() < 2) {
return;
}
final int width = getWidth();
final int height = getHeight();
boolean started = false;
float lastX = 0;
float lastY = height;
long lastTime = mHoriz.convertToValue(lastX);
// move into starting position
mPathStroke.moveTo(lastX, lastY);
mPathFill.moveTo(lastX, lastY);
// TODO: count fractional data from first bucket crossing start;
// currently it only accepts first full bucket.
long totalData = 0;
NetworkStatsHistory.Entry entry = null;
final int start = mStats.getIndexBefore(mStart);
final int end = mStats.getIndexAfter(mEnd);
for (int i = start; i <= end; i++) {
entry = mStats.getValues(i, entry);
final long startTime = entry.bucketStart;
final long endTime = startTime + entry.bucketDuration;
final float startX = mHoriz.convertToPoint(startTime);
final float endX = mHoriz.convertToPoint(endTime);
// skip until we find first stats on screen
if (endX < 0) continue;
// increment by current bucket total
totalData += entry.rxBytes + entry.txBytes;
final float startY = lastY;
final float endY = mVert.convertToPoint(totalData);
if (lastTime != startTime) {
// gap in buckets; line to start of current bucket
mPathStroke.lineTo(startX, startY);
mPathFill.lineTo(startX, startY);
}
// always draw to end of current bucket
mPathStroke.lineTo(endX, endY);
mPathFill.lineTo(endX, endY);
lastX = endX;
lastY = endY;
lastTime = endTime;
}
// when data falls short, extend to requested end time
if (lastTime < mEndTime) {
lastX = mHoriz.convertToPoint(mEndTime);
mPathStroke.lineTo(lastX, lastY);
mPathFill.lineTo(lastX, lastY);
}
if (LOGD) {
final RectF bounds = new RectF();
mPathFill.computeBounds(bounds, true);
Log.d(
TAG,
"onLayout() rendered with bounds=" + bounds.toString() + " and totalData=" + totalData);
}
// drop to bottom of graph from current location
mPathFill.lineTo(lastX, height);
mPathFill.lineTo(0, height);
mMax = totalData;
// build estimated data
mPathEstimate.moveTo(lastX, lastY);
final long now = System.currentTimeMillis();
final long bucketDuration = mStats.getBucketDuration();
// long window is average over two weeks
entry = mStats.getValues(lastTime - WEEK_IN_MILLIS * 2, lastTime, now, entry);
final long longWindow = (entry.rxBytes + entry.txBytes) * bucketDuration / entry.bucketDuration;
long futureTime = 0;
while (lastX < width) {
futureTime += bucketDuration;
// short window is day average last week
final long lastWeekTime = lastTime - WEEK_IN_MILLIS + (futureTime % WEEK_IN_MILLIS);
entry = mStats.getValues(lastWeekTime - DAY_IN_MILLIS, lastWeekTime, now, entry);
final long shortWindow =
(entry.rxBytes + entry.txBytes) * bucketDuration / entry.bucketDuration;
totalData += (longWindow * 7 + shortWindow * 3) / 10;
lastX = mHoriz.convertToPoint(lastTime + futureTime);
lastY = mVert.convertToPoint(totalData);
mPathEstimate.lineTo(lastX, lastY);
}
mMaxEstimate = totalData;
invalidate();
}