ca.uhn.fhir.util.StopWatch Maven / Gradle / Ivy
/*
* #%L
* HAPI FHIR - Core Library
* %%
* Copyright (C) 2014 - 2024 Smile CDR, Inc.
* %%
* 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.
* #L%
*/
package ca.uhn.fhir.util;
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.lang3.Validate;
import org.apache.commons.lang3.time.DateUtils;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Date;
import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
/**
* A multipurpose stopwatch which can be used to time tasks and produce
* human readable output about task duration, throughput, estimated task completion,
* etc.
*
*
* Thread Safety Note: StopWatch is not intended to be thread safe.
*
*
* @since HAPI FHIR 3.3.0
*/
public class StopWatch {
// TODO KHS it is risky for this to be a static field. Safer to make it non-static, but that will require
// TODO KHS significant rework of StopWatchTest
private static Long ourNowForUnitTest;
private long myStarted = now();
private TaskTiming myCurrentTask;
private LinkedList myTasks;
/**
* Constructor
*/
public StopWatch() {
super();
}
/**
* Constructor
*
* @param theStart The time to record as the start for this timer
*/
public StopWatch(Date theStart) {
myStarted = theStart.getTime();
}
/**
* Constructor
*
* @param theStart The time that the stopwatch was started
*/
public StopWatch(long theStart) {
myStarted = theStart;
}
private void addNewlineIfContentExists(StringBuilder theB) {
if (theB.length() > 0) {
theB.append("\n");
}
}
/**
* Finish the counter on the current task (which was started by calling
* {@link #startTask(String)}. This method has no effect if no task
* is currently started so it's ok to call it more than once.
*/
public void endCurrentTask() {
ensureTasksListExists();
if (myCurrentTask != null) {
myCurrentTask.setEnd(now());
}
myCurrentTask = null;
}
private void ensureTasksListExists() {
if (myTasks == null) {
myTasks = new LinkedList<>();
}
}
/**
* Returns a nice human-readable display of the time taken per
* operation. Note that this may not actually output the number
* of milliseconds if the time taken per operation was very long (over
* 10 seconds)
*
* @see #formatMillis(long)
*/
public String formatMillisPerOperation(long theNumOperations) {
double millisPerOperation = (((double) getMillis()) / Math.max(1.0, theNumOperations));
return formatMillis(millisPerOperation);
}
/**
* Returns a string providing the durations of all tasks collected by {@link #startTask(String)}
*/
public String formatTaskDurations() {
ensureTasksListExists();
StringBuilder b = new StringBuilder();
if (myTasks.size() > 0) {
long delta = myTasks.getFirst().getStart() - myStarted;
if (delta > 10) {
addNewlineIfContentExists(b);
b.append("Before first task");
b.append(": ");
b.append(formatMillis(delta));
}
} else {
b.append("No tasks");
}
TaskTiming last = null;
for (TaskTiming nextTask : myTasks) {
if (last != null) {
long delta = nextTask.getStart() - last.getEnd();
if (delta > 10) {
addNewlineIfContentExists(b);
b.append("Between");
b.append(": ");
b.append(formatMillis(delta));
}
}
addNewlineIfContentExists(b);
b.append(nextTask.getTaskName());
b.append(": ");
long delta = nextTask.getMillis();
b.append(formatMillis(delta));
last = nextTask;
}
if (myTasks.size() > 0) {
long delta = now() - myTasks.getLast().getEnd();
if (delta > 10) {
addNewlineIfContentExists(b);
b.append("After last task");
b.append(": ");
b.append(formatMillis(delta));
}
}
return b.toString();
}
/**
* Determine the current throughput per unit of time (specified in theUnit)
* assuming that theNumOperations operations have happened.
*
* For example, if this stopwatch has 2 seconds elapsed, and this method is
* called for theNumOperations=30 and TimeUnit=SECONDS,
* this method will return 15
*
*
* @see #getThroughput(long, TimeUnit)
*/
public String formatThroughput(long theNumOperations, TimeUnit theUnit) {
double throughput = getThroughput(theNumOperations, theUnit);
return formatThroughput(throughput);
}
/**
* Given an amount of something completed so far, and a total amount, calculates how long it will take for something to complete
*
* @param theCompleteToDate The amount so far
* @param theTotal The total (must be higher than theCompleteToDate
* @return A formatted amount of time
*/
public String getEstimatedTimeRemaining(double theCompleteToDate, double theTotal) {
double millis = getMillis();
return formatEstimatedTimeRemaining(theCompleteToDate, theTotal, millis);
}
/**
* Given an amount of something completed so far, and a total amount, calculates how long it will take for something to complete
*
* @param theCompleteToDate The amount so far
* @param theTotal The total (must be higher than theCompleteToDate
* @return A formatted amount of time
*/
public static String formatEstimatedTimeRemaining(double theCompleteToDate, double theTotal, double millis) {
long millisRemaining = (long) (((theTotal / theCompleteToDate) * millis) - millis);
return formatMillis(millisRemaining);
}
public long getMillis(Date theNow) {
return theNow.getTime() - myStarted;
}
public long getMillis() {
long now = now();
return now - myStarted;
}
public long getMillisAndRestart() {
long now = now();
long retVal = now - myStarted;
myStarted = now;
return retVal;
}
/**
* @param theNumOperations Ok for this to be 0, it will be treated as 1
*/
public long getMillisPerOperation(long theNumOperations) {
return (long) (((double) getMillis()) / Math.max(1.0, theNumOperations));
}
public Date getStartedDate() {
return new Date(myStarted);
}
/**
* Determine the current throughput per unit of time (specified in theUnit)
* assuming that theNumOperations operations have happened.
*
* For example, if this stopwatch has 2 seconds elapsed, and this method is
* called for theNumOperations=30 and TimeUnit=SECONDS,
* this method will return 15
*
*
* @see #formatThroughput(long, TimeUnit)
*/
public double getThroughput(long theNumOperations, TimeUnit theUnit) {
long millis = getMillis();
return getThroughput(theNumOperations, millis, theUnit);
}
public void restart() {
myStarted = now();
}
/**
* Starts a counter for a sub-task
*
* Thread Safety Note: This method is not threadsafe! Do not use subtasks in a
* multithreaded environment.
*
*
* @param theTaskName Note that if theTaskName is blank or empty, no task is started
*/
public void startTask(String theTaskName) {
endCurrentTask();
Validate.notBlank(theTaskName, "Task name must not be blank");
myCurrentTask = new TaskTiming().setTaskName(theTaskName).setStart(now());
myTasks.add(myCurrentTask);
}
/**
* Formats value in an appropriate format. See {@link #formatMillis(long)}}
* for a description of the format
*
* @see #formatMillis(long)
*/
@Override
public String toString() {
return formatMillis(getMillis());
}
/**
* Format a throughput number (output does not include units)
*/
public static String formatThroughput(double throughput) {
return new DecimalFormat("0.0").format(throughput);
}
/**
* Calculate throughput
*
* @param theNumOperations The number of operations completed
* @param theMillisElapsed The time elapsed
* @param theUnit The unit for the throughput
*/
public static double getThroughput(long theNumOperations, long theMillisElapsed, TimeUnit theUnit) {
if (theNumOperations <= 0) {
return 0.0f;
}
long millisElapsed = Math.max(1, theMillisElapsed);
long periodMillis = theUnit.toMillis(1);
double denominator = ((double) millisElapsed) / ((double) periodMillis);
double throughput = (double) theNumOperations / denominator;
if (throughput > theNumOperations) {
throughput = theNumOperations;
}
return throughput;
}
private static NumberFormat getDayFormat() {
return new DecimalFormat("0.0");
}
private static NumberFormat getTenDayFormat() {
return new DecimalFormat("0");
}
private static NumberFormat getSubMillisecondMillisFormat() {
return new DecimalFormat("0.000");
}
/**
* Append a right-aligned and zero-padded numeric value to a `StringBuilder`.
*/
static void appendRightAlignedNumber(
StringBuilder theStringBuilder, String thePrefix, int theNumberOfDigits, long theValueToAppend) {
theStringBuilder.append(thePrefix);
if (theNumberOfDigits > 1) {
int pad = (theNumberOfDigits - 1);
for (long xa = theValueToAppend; xa > 9 && pad > 0; xa /= 10) {
pad--;
}
for (int xa = 0; xa < pad; xa++) {
theStringBuilder.append('0');
}
}
theStringBuilder.append(theValueToAppend);
}
/**
* Formats a number of milliseconds for display (e.g.
* in a log file), tailoring the output to how big
* the value actually is.
*
* Example outputs:
*
*
* - 133ms
* - 00:00:10.223
* - 1.7 days
* - 64 days
*
*/
public static String formatMillis(long theMillis) {
return formatMillis((double) theMillis);
}
/**
* Formats a number of milliseconds for display (e.g.
* in a log file), tailoring the output to how big
* the value actually is.
*
* Example outputs:
*
*
* - 133ms
* - 00:00:10.223
* - 1.7 days
* - 64 days
*
*/
public static String formatMillis(double theMillis) {
StringBuilder buf = new StringBuilder(20);
if (theMillis > 0.0 && theMillis < 1.0) {
buf.append(getSubMillisecondMillisFormat().format(theMillis));
buf.append("ms");
} else if (theMillis < (10 * DateUtils.MILLIS_PER_SECOND)) {
buf.append((int) theMillis);
buf.append("ms");
} else if (theMillis >= DateUtils.MILLIS_PER_DAY) {
double days = theMillis / DateUtils.MILLIS_PER_DAY;
if (days >= 10) {
buf.append(getTenDayFormat().format(days));
buf.append(" days");
} else if (days != 1.0f) {
buf.append(getDayFormat().format(days));
buf.append(" days");
} else {
buf.append(getDayFormat().format(days));
buf.append(" day");
}
} else {
long millisAsLong = (long) theMillis;
appendRightAlignedNumber(
buf, "", 2, ((millisAsLong % DateUtils.MILLIS_PER_DAY) / DateUtils.MILLIS_PER_HOUR));
appendRightAlignedNumber(
buf, ":", 2, ((millisAsLong % DateUtils.MILLIS_PER_HOUR) / DateUtils.MILLIS_PER_MINUTE));
appendRightAlignedNumber(
buf, ":", 2, ((millisAsLong % DateUtils.MILLIS_PER_MINUTE) / DateUtils.MILLIS_PER_SECOND));
if (theMillis <= DateUtils.MILLIS_PER_MINUTE) {
appendRightAlignedNumber(buf, ".", 3, (millisAsLong % DateUtils.MILLIS_PER_SECOND));
}
}
return buf.toString();
}
private static long now() {
if (ourNowForUnitTest != null) {
return ourNowForUnitTest;
}
return System.currentTimeMillis();
}
@VisibleForTesting
public static void setNowForUnitTest(Long theNowForUnitTest) {
ourNowForUnitTest = theNowForUnitTest;
}
private static class TaskTiming {
private long myStart;
private long myEnd;
private String myTaskName;
public long getEnd() {
if (myEnd == 0) {
return now();
}
return myEnd;
}
public TaskTiming setEnd(long theEnd) {
myEnd = theEnd;
return this;
}
public long getMillis() {
return getEnd() - getStart();
}
public long getStart() {
return myStart;
}
public TaskTiming setStart(long theStart) {
myStart = theStart;
return this;
}
public String getTaskName() {
return myTaskName;
}
public TaskTiming setTaskName(String theTaskName) {
myTaskName = theTaskName;
return this;
}
}
}
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