[#BloombergLP-ball-Observer]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::Observer
:relfileprefix: ../../
:mrdocs:

This class provides a protocol for receiving and processing log record output.

== Synopsis

Declared in `<ball_observer.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class Observer;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/ball/Observer/2destructor.adoc[`~Observer`] [.small]#[destructor]# [.small]#[virtual]#
| Destroy this observer.
| xref:BloombergLP/ball/Observer/publish-0b.adoc[`publish`] 
| `publish` overloads
| xref:BloombergLP/ball/Observer/releaseRecords.adoc[`releaseRecords`]  [.small]#[virtual]#
| Discard shared references to published `Record` objects held by this observer.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/ball/AsyncFileObserver.adoc[`AsyncFileObserver`] 
| Asynchronous observer that publishes log records to `stdout` and a file.
| xref:BloombergLP/ball/BroadcastObserver.adoc[`BroadcastObserver`] 
| This class provides a broadcasting implementation of the `Observer` protocol.
| xref:BloombergLP/ball/CstdioObserver.adoc[`CstdioObserver`] 
| This class provides a concrete implementation of the `Observer` protocol.
| xref:BloombergLP/ball/FileObserver.adoc[`FileObserver`] 
| Observer that publishes log records to `stdout` and optionally a file.
| xref:BloombergLP/ball/FileObserver2.adoc[`FileObserver2`] 
| Observer that publishes log records to a user‐specified file.
| xref:BloombergLP/ball/FilteringObserver.adoc[`FilteringObserver`] 
| This class provides a concrete `Observer` that filters log records.
| xref:BloombergLP/ball/MultiplexObserver.adoc[`MultiplexObserver`] 
| This class provides a multiplexing implementation of the `Observer` protocol.
| xref:BloombergLP/ball/ObserverAdapter.adoc[`ObserverAdapter`] 
| This class provides a helper for implementing the `Observer` protocol.
| xref:BloombergLP/ball/StreamObserver.adoc[`StreamObserver`] 
| This class provides a concrete implementation of the `Observer` protocol.
| xref:BloombergLP/ball/TestObserver.adoc[`TestObserver`] 
| This class provides an instrumented implementation of the `Observer` protocol suitable for testing.
|===


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