RFR: 6988: Initial implementation of JFR binary format writer [v7]

[Marcus Hirt]

On Fri, 15 Jan 2021 14:08:30 GMT, Jaroslav Bachorik <jbachorik at openjdk.org> wrote:

>> This is an initial implementation of JFR binary format writer in Java.
>> The writer can write valid JFR files according to what is expected by the JMC JFR format reader.
>> The writer is not complete in terms of performance and event settings support but in spite of that it is fairly usable.
>> 
>> The typical flow is:
>> 
>> 1. Obtain a new instance of Recording
>>  java
>> Recording r = new Recording()
>> 2. Register custom types for that recording
>>  java
>> r.registerType(name, structure)
>> 3. Get a new Chunk instance
>>  java
>> Chunk c = r.newChunk()
>> 4. Write event values
>>  java
>> c.writeEvent(eventValue)
>> 5. Finish the chunk and get the binary data
>>  java
>> byte[] data = c.finish()
>> 
>> 
>> For more complex usage check [ChunkComplexTest.java](https://github.com/openjdk/jmc/blob/4c2dd1407f462feae40b795d3a4c6d75544b4e82/core/org.openjdk.jmc.flightrecorder.writer/src/test/java/org/openjdk/jmc/flightrecorder/writer/ChunkComplexTest.java).
>
> Jaroslav Bachorik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Prevent lost writes due to delayed queue processing

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/84