public class GzipByteSource extends Object implements ByteSource
The bytes of this source will be in the gzip format.
| Constructor and Description |
|---|
GzipByteSource(ByteSource origin,
int compressionLevel)
Create a GzipByteSource, which compresses the origin source with gzip.
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public GzipByteSource(ByteSource origin, int compressionLevel)
`compressionLevel` can be 0-9. For on-the-fly gzip, consider compressionLevel=1, which is faster, with pretty good compression ratio.
public Async<ByteBuffer> read() throws IllegalStateException
ByteSourceThe method returns an `Async<ByteBuffer>` which eventually completes in 3 possible ways:
End, indicating EOF.
Example Usage:
AsyncIterator.forEach( source::read, System.out::println )
.finally_( source::close );
The resulting ByteBuffer may contain any number of bytes. For example, it may be a view of
a huge ByteBuffer that's cached and shared.
You may use PushbackByteSource to "unread".
The ownership of the ByteBuffer is transferred to the caller. The content of the ByteBuffer should be treated as read-only.
CAUTION: since ByteBuffer is stateful (even for methods like ByteBuffer.get()),
a new ByteBuffer must be created for each read() action.
The implementation may create a view of a shared ByteBuffer through
ByteBuffer.asReadOnlyBuffer().
The app should wait for this read() action to complete before it calls another method on this source.
read in interface ByteSourceIllegalStateExceptionpublic Async<Void> close()
ByteSourceThis method can be called multiple times; only the first call is effective.
This method should not be invoked while a read() is pending;
if that's needed, see ThreadSafeByteSource for a solution.
Since ByteSource is a read-only concept, close() should not have any
side effects that the caller cares about.
The caller is allowed to ignore the returned Async<Void>
(as if the method returns void).
The close() action should not fail; if some internal exception arises, it can be logged.
Most implementations return an immediate Async.VOID,
even if there are still background cleanup tasks running.
close in interface ByteSource