/*
* Copyright 2014-2016 the original author or authors.
*
* 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 org.glowroot.ui;
import java.util.List;
import javax.annotation.Nullable;
import org.glowroot.common.repo.Utils;
class DataSeriesHelper {
private final long liveCaptureTime;
private final long dataPointIntervalMillis;
DataSeriesHelper(long liveCaptureTime, long dataPointIntervalMillis) {
this.liveCaptureTime = liveCaptureTime;
this.dataPointIntervalMillis = dataPointIntervalMillis;
}
void addInitialUpslopeIfNeeded(long requestFrom, long captureTime,
List<DataSeries> dataSeriesList, @Nullable DataSeries otherDataSeries) {
if (captureTime == requestFrom) {
return;
}
// bring up from zero
long priorCaptureTime = getPriorCaptureTime(captureTime);
for (DataSeries dataSeries : dataSeriesList) {
dataSeries.add(priorCaptureTime, 0);
}
if (otherDataSeries != null) {
otherDataSeries.add(priorCaptureTime, 0);
}
}
void addGapIfNeeded(long lastCaptureTime, long captureTime, List<DataSeries> dataSeriesList,
@Nullable DataSeries otherDataSeries) {
long millisecondsSinceLastPoint = captureTime - lastCaptureTime;
if (millisecondsSinceLastPoint <= dataPointIntervalMillis) {
return;
}
// gap between points, bring down to zero and then back up from zero to show gap
for (DataSeries dataSeries : dataSeriesList) {
addGap(dataSeries, lastCaptureTime, captureTime);
}
if (otherDataSeries != null) {
addGap(otherDataSeries, lastCaptureTime, captureTime);
}
}
void addFinalDownslopeIfNeeded(List<DataSeries> dataSeriesList,
@Nullable DataSeries otherDataSeries, long lastCaptureTime) {
long downslopeCaptureTime = finalDownslopeCaptureTime(lastCaptureTime);
if (downslopeCaptureTime != 0) {
// bring down to zero
for (DataSeries dataSeries : dataSeriesList) {
dataSeries.add(downslopeCaptureTime, 0);
}
if (otherDataSeries != null) {
otherDataSeries.add(downslopeCaptureTime, 0);
}
}
}
void addInitialUpslopeIfNeeded(long requestFrom, long captureTime, DataSeries dataSeries) {
if (captureTime == requestFrom) {
return;
}
// bring up from zero
long priorCaptureTime = getPriorCaptureTime(captureTime);
dataSeries.add(priorCaptureTime, 0);
}
void addGapIfNeeded(long lastCaptureTime, long captureTime, DataSeries dataSeries) {
long millisecondsSinceLastPoint = captureTime - lastCaptureTime;
if (millisecondsSinceLastPoint <= dataPointIntervalMillis) {
return;
}
// gap between points, bring down to zero and then back up from zero to show gap
addGap(dataSeries, lastCaptureTime, captureTime);
}
void addFinalDownslopeIfNeeded(DataSeries dataSeries, long lastCaptureTime) {
long downslopeCaptureTime = finalDownslopeCaptureTime(lastCaptureTime);
if (downslopeCaptureTime != 0) {
// bring down to zero
dataSeries.add(downslopeCaptureTime, 0);
}
}
private void addGap(DataSeries dataSeries, long lastCaptureTime, long captureTime) {
long currentCaptureTime = getCurrentCaptureTime(captureTime);
if (currentCaptureTime - lastCaptureTime == 2 * dataPointIntervalMillis) {
// only a single missing point
dataSeries.add(lastCaptureTime + dataPointIntervalMillis, 0);
} else {
dataSeries.add(lastCaptureTime + dataPointIntervalMillis, 0);
dataSeries.addNull();
dataSeries.add(currentCaptureTime - dataPointIntervalMillis, 0);
}
}
// returns 0 if final downslope is not needed
private long finalDownslopeCaptureTime(long lastCaptureTime) {
if (liveCaptureTime - lastCaptureTime > 1.5 * dataPointIntervalMillis) {
return lastCaptureTime + dataPointIntervalMillis;
}
return 0;
}
private long getPriorCaptureTime(long captureTime) {
return getCurrentCaptureTime(captureTime) - dataPointIntervalMillis;
}
// captureTime may be for active point which doesn't line up on data point interval
private long getCurrentCaptureTime(long captureTime) {
return Utils.getRollupCaptureTime(captureTime, dataPointIntervalMillis);
}
}