pl.mjaron.tinyloki

Class JsonLogCollector

java.lang.Object

pl.mjaron.tinyloki.JsonLogCollector

All Implemented Interfaces:

ILogCollector

public class JsonLogCollector
extends java.lang.Object
implements ILogCollector

Collects logs in a JSON format consistent with Loki Push API.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CONTENT_TYPE

Constructor Summary

Constructors

Constructor and Description
JsonLogCollector()

Method Summary

Modifier and Type	Method and Description
byte[]	collect() Create complete stream chunk in JSON string, stored as UTF-8 bytes.
java.lang.String	collectAsString() Create complete stream chunk in JSON string.
java.lang.String	contentType() Used in HTTP Content-Type header.
ILogStream	createStream(Labels labels) Creates new instance of stream which will notify this collector about new logs.
void	onStreamReleased(ILogStream stream) Given stream will not be flushed by this log collector anymore, so given stream will accumulate all next logs causing memory leaks (if it will not be garbage collected).
int	waitForLogs(long timeout) Blocking function.

Methods inherited from class java.lang.Object

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

Field Detail

CONTENT_TYPE

public static final java.lang.String CONTENT_TYPE

See Also:

Constant Field Values

Constructor Detail

JsonLogCollector

public JsonLogCollector()

Method Detail

createStream

public ILogStream createStream(Labels labels)

Creates new instance of stream which will notify this collector about new logs. This collector will flush logs from the stream.

Specified by:

createStream in interface ILogCollector

Parameters:

labels - Unique set of labels.

Returns:

New instance of a stream.

onStreamReleased

public void onStreamReleased(ILogStream stream)

Given stream will not be flushed by this log collector anymore, so given stream will accumulate all next logs causing memory leaks (if it will not be garbage collected). Called by JsonLogStream.release(), so there is no need to call it directly.

Parameters:

stream - Stream to release.

collect

public byte[] collect()

Create complete stream chunk in JSON string, stored as UTF-8 bytes.

Specified by:

collect in interface ILogCollector

Returns:

JSON bytes containing stream chunk.

collectAsString

public java.lang.String collectAsString()

Create complete stream chunk in JSON string.

Returns:

JSON string containing stream chunk.

contentType

public java.lang.String contentType()

Used in HTTP Content-Type header. Grafana Loki will interpret content as JSON.

Specified by:

contentType in interface ILogCollector

Returns:

String complaint with HTTP Content-Type header, telling that content is a JSON data.

waitForLogs

public int waitForLogs(long timeout)
                throws java.lang.InterruptedException

Blocking function. Waits until at least one log from any stream occurs.

Specified by:

waitForLogs in interface ILogCollector

Parameters:

timeout - Time in milliseconds.

Returns:

Collected logs count.

Throws:

java.lang.InterruptedException - When this thread is interrupted during waiting.