Package org.springframework.boot.context.metrics.buffering

Class BufferingApplicationStartup

java.lang.Object

org.springframework.boot.context.metrics.buffering.BufferingApplicationStartup

All Implemented Interfaces:

ApplicationStartup

public class BufferingApplicationStartup
extends Object
implements ApplicationStartup

ApplicationStartup implementation that buffers steps and records their timestamp as well as their processing time.

Once recording has been started, steps are buffered up until the configured capacity; after that, new steps are not recorded.

There are several ways to keep the buffer size low:

• configuring filters to only record steps that are relevant to us.
• draining the buffered steps.

Since:

2.4.0

Author:

Brian Clozel, Phillip Webb

Field Summary

Fields inherited from interface org.springframework.core.metrics.ApplicationStartup

DEFAULT

Constructor Summary

Constructors

Constructor	Description
BufferingApplicationStartup(int capacity)	Create a new buffered ApplicationStartup with a limited capacity and starts the recording of steps.

Method Summary

Modifier and Type	Method	Description
void	addFilter(Predicate<StartupStep> filter)	Add a predicate filter to the list of existing ones.
StartupTimeline	drainBufferedTimeline()	Return the timeline by pulling steps from the buffer.
StartupTimeline	getBufferedTimeline()	Return the timeline as a snapshot of currently buffered steps.
StartupStep	start(String name)
void	startRecording()	Start the recording of steps and mark the beginning of the StartupTimeline.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BufferingApplicationStartup

public BufferingApplicationStartup(int capacity)

Create a new buffered ApplicationStartup with a limited capacity and starts the recording of steps.

Parameters:

capacity - the configured capacity; once reached, new steps are not recorded.

Method Details

startRecording

public void startRecording()

Start the recording of steps and mark the beginning of the StartupTimeline. The class constructor already implicitly calls this, but it is possible to reset it as long as steps have not been recorded already.

Throws:

IllegalStateException - if called and StartupStep have been recorded already.

addFilter

public void addFilter(Predicate<StartupStep> filter)

Add a predicate filter to the list of existing ones.

A step that doesn't match all filters will not be recorded.

Parameters:

filter - the predicate filter to add.

start

public StartupStep start(String name)

Specified by:

start in interface ApplicationStartup

getBufferedTimeline

public StartupTimeline getBufferedTimeline()

Return the timeline as a snapshot of currently buffered steps.

This will not remove steps from the buffer, see drainBufferedTimeline() for its counterpart.

Returns:

a snapshot of currently buffered steps.

drainBufferedTimeline

public StartupTimeline drainBufferedTimeline()

Return the timeline by pulling steps from the buffer.

This removes steps from the buffer, see getBufferedTimeline() for its read-only counterpart.

Returns:

buffered steps drained from the buffer.