object stream2iter extends Iterator[(LogSequenceNumber, String)] {
override def next: (LogSequenceNumber, String) = {
try {
val msg = stream.read
//println(msg)
val offset = msg.arrayOffset
val src = msg.array
val len = src.length - offset
inprogressbyte.set(len)
val log = new String(src, offset, len)
logger.debug(log)
val tmpLSN = stream.getLastReceiveLSN
(tmpLSN, log)
} catch {
case e: Throwable =>
println(e)
(LogSequenceNumber.INVALID_LSN, "")
}
}
override def hasNext: Boolean = !stream.isClosed
}
val srcStream: Source[(LogSequenceNumber, String), NotUsed] =
Source.fromIterator(() => stream2iter)
val sink: Sink[LogRecord, Future[Done]] = Sink.foreach(log => {
logger.debug(s"LSN: ${log.lsn}, target: ${log.target.fullname}")
if (log.lsn != LogSequenceNumber.INVALID_LSN)
lastReceiveLSN = log.lsn
stream.setAppliedLSN(lastReceiveLSN)
stream.setFlushedLSN(lastReceiveLSN)
})
val totalG: RunnableGraph[NotUsed] = srcStream.via(graph(system)).to(sink)
val res = totalG.run()
// Now, stream.read is too fast(producer is fast, but consumer is slower),so
can I use back pressure
// in iterator and can someone help me :-)
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