Package com.fayupable.logged.test

Class InMemoryMetricsRecorder

java.lang.Object

com.fayupable.logged.test.InMemoryMetricsRecorder

All Implemented Interfaces:

MetricsRecorder

public final class InMemoryMetricsRecorder
extends Object
implements MetricsRecorder

A MetricsRecorder that records every call it is asked to record in memory as a RecordedMetric, instead of forwarding it to a real metrics backend such as Micrometer.

Unlike InMemoryInvocationEventEmitter, which mirrors a sampled, threshold-gated emission, this recorder always receives every invocation, matching MetricsRecorder's own contract; a test asserting on metrics does not need to also configure sampling.

Backed by a CopyOnWriteArrayList for the same reason as InMemoryInvocationEventEmitter: recording may happen from more than one thread when the method under test hands work off to an executor.

Constructor Summary

Constructors

Constructor	Description
InMemoryMetricsRecorder()

Method Summary

Modifier and Type	Method	Description
void	clear()	Discards every metric recorded so far, so this instance can be reused across test methods without leaking state between them.
int	count()	Returns the number of metrics recorded so far.
RecordedMetric	lastMetric()	Returns the most recently recorded metric.
List<RecordedMetric>	metrics()	Returns every metric recorded so far, in recording order.
void	record(String className, String methodName, long durationNanos, boolean success, String exceptionType)	Records the outcome and duration of a single method invocation.

Methods inherited from class java.lang.Object

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

Constructor Details

InMemoryMetricsRecorder

public InMemoryMetricsRecorder()

Method Details

record

public void record(String className,
 String methodName,
 long durationNanos,
 boolean success,
 String exceptionType)

Description copied from interface: MetricsRecorder

Records the outcome and duration of a single method invocation.

Specified by:

record in interface MetricsRecorder

Parameters:

className - the simple or fully qualified name of the class declaring the invoked method

methodName - the name of the invoked method

durationNanos - the wall-clock duration of the invocation, in nanoseconds

success - true if the method returned normally, false if it threw an exception

exceptionType - the simple class name of the exception thrown by the method, or null if the call succeeded

metrics

public List<RecordedMetric> metrics()

Returns every metric recorded so far, in recording order.

Returns:

an immutable snapshot of the recorded metrics

count

public int count()

Returns the number of metrics recorded so far.

Returns:

the recorded metric count

lastMetric

public RecordedMetric lastMetric()

Returns the most recently recorded metric.

Returns:

the last recorded metric

Throws:

IllegalStateException - if no metric has been recorded yet

clear

public void clear()

Discards every metric recorded so far, so this instance can be reused across test methods without leaking state between them.