128403b492
Motivation ByteBuf capacity is automatically increased as needed up to maxCapacity when writing beyond the buffer's current capacity. However there's no way to tell in general whether such an increase will result in a relatively costly internal buffer re-allocation. For unpooled buffers it always does, in pooled cases it depends on the size of the associated chunk of allocated memory, which I don't think is currently exposed in any way. It would sometimes be useful to know where this limit is when making external decisions about whether to reuse or preemptively reallocate. It would also be advantageous to take this limit into account when auto-increasing the capacity during writes, to defer such reallocation until really necessary. Modifications Introduce new AbstractByteBuf.maxFastWritableBytes() method which will return a value >= writableBytes() and <= maxWritableBytes(). Make use of the new method in the sizing decision made by the AbstractByteBuf.ensureWritable(...) methods. Result Less reallocation/copying. |
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