Package ru.vyarus.dropwizard.guice.test.log

Class RecordLogsHook

java.lang.Object

ru.vyarus.dropwizard.guice.test.log.RecordLogsHook

All Implemented Interfaces:

GuiceyConfigurationHook

public class RecordLogsHook
extends java.lang.Object
implements GuiceyConfigurationHook

Record log events for verification. IMPORTANT: works ONLY with logback (would be useless with another logger).

Without additional configuration would record all events (from the root logger): hook.record().start(Level.INFO) In most cases, it would be more convenient to listen to the exact logger logs: hook.record(Service.class).start(Level.INFO) - listen Service logs (assuming logger created as LoggerFactory.getLogger(Service.class)). Entire packages could be listened with: hook.register("com.package").start(Level.INFO). (class and string loggers could be specified together).

Could be used for a quick logger configuration changes in tests (easy switch to TRACE, for example).

Recorded events could be inspected with RecordedLogs object: RecordedLogs logs = hook.record().start(Level.INFO);. Raw recorded event objects could be used (logs.getEvents()) or just string messages (logs.getMessages()). There are many other methods to filter recorded logs.

Events recorded for the entire application startup. Dropwizard resets loggers two times: in application constructor and just before the run phase (log configuration factory init), so logs listener appender have to be re-registered. LIMITATION: would not see run phase logs of dropwizard bundles, registered BEFORE GuiceBundle (no way re-attach listener before it). For dropwizard bundles, registered after guice bundle (or inside it) - all logs would be visible.

Recorded logs could be cleared either with RecordedLogs.clear() or with clearLogs() for all registered recorders.

Since:

30.04.2025

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	RecordLogsHook.Builder	Log recorder configuration builder.
class	RecordLogsHook.RecordedLogsTrackingBundle	Technical bundle used to re-attach log recorders after dropwizard resets all loggers.

Constructor Summary

Constructors

Constructor	Description
RecordLogsHook()

Method Summary

Modifier and Type	Method	Description
void	clearLogs()	Clear recorded logs for all registered recorders.
void	configure(GuiceBundle.Builder builder)	Configuration is applied just after manual configuration (through bundle's builder in application class).
void	destroy()	Detach all registered appenders from logback loggers.
RecordLogsHook.Builder	record()	Start recorder configuration.

Methods inherited from class java.lang.Object

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

Methods inherited from interface ru.vyarus.dropwizard.guice.hook.GuiceyConfigurationHook

register

Constructor Detail

RecordLogsHook

public RecordLogsHook()

Method Detail

configure

public void configure(GuiceBundle.Builder builder)
               throws java.lang.Exception

Description copied from interface: GuiceyConfigurationHook

Configuration is applied just after manual configuration (through bundle's builder in application class).

GuiceBundle.Builder contains special methods for test support:

• Generic disable: GuiceBundle.Builder.disable(java.util.function.Predicate[])
• Direct disable* method, for example GuiceBundle.Builder.disableExtensions(Class[])
• Guice bindings override: GuiceBundle.Builder.modulesOverride(com.google.inject.Module...)

All other configuration options are also available, so it is possible to register extra extensions, bundles etc. or modify guicey options (GuiceBundle.Builder.option(Enum, Object)).

All configuration items, registered with hook will be scoped as GuiceyConfigurationHook instead of Application and so will be clearly distinguishable in configuration logs (GuiceBundle.Builder.printDiagnosticInfo()).

Specified by:

configure in interface GuiceyConfigurationHook

Parameters:

builder - just created bundle's builder

Throws:

java.lang.Exception - on error (simplify usage)

record

public RecordLogsHook.Builder record()

Start recorder configuration. If no loggers provided then root logger would be listened (all events).

Minimal usage: record().loggers(Service.class).start(Level.INFO). Could be mixed with string-based loggers declaration: record().loggers(Service.class).loggers("some.string.logger").start(Level.INFO).

Returns:

builder for additional configuration

clearLogs

public void clearLogs()

Clear recorded logs for all registered recorders.

destroy

public void destroy()

Detach all registered appenders from logback loggers.

Not required as dropwizard reset all logging during application startup and so stale appenders would be removed in any case before each new test.