RFR: 8269685: Optimize HeapHprofBinWriter implementation [v3]

[Serguei Spitsyn]

On Mon, 5 Jul 2021 12:04:17 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> This PR rewrite the implementation of the HeapHprofBinWriter, which could simplify the logic of current implementation.
>> please see detail description at https://bugs.openjdk.java.net/browse/JDK-8269685.
>
> Lin Zang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix write size issue

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/AbstractHeapGraphWriter.java line 141:

> 139:         return 0;
> 140:     }
> 141: 

Hi Lin,
I don't like these empty methods in this abstract class.
Should they be just abstract instead?
Thanks,
Serguei

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PR: https://git.openjdk.java.net/jdk/pull/4666