public virtual void TestDoubleBuffer()
{
EditsDoubleBuffer buf = new EditsDoubleBuffer(1024);
NUnit.Framework.Assert.IsTrue(buf.IsFlushed());
byte[] data = new byte[100];
buf.WriteRaw(data, 0, data.Length);
NUnit.Framework.Assert.AreEqual("Should count new data correctly", data.Length, buf
.CountBufferedBytes());
NUnit.Framework.Assert.IsTrue("Writing to current buffer should not affect flush state"
, buf.IsFlushed());
// Swap the buffers
buf.SetReadyToFlush();
NUnit.Framework.Assert.AreEqual("Swapping buffers should still count buffered bytes"
, data.Length, buf.CountBufferedBytes());
NUnit.Framework.Assert.IsFalse(buf.IsFlushed());
// Flush to a stream
DataOutputBuffer outBuf = new DataOutputBuffer();
buf.FlushTo(outBuf);
NUnit.Framework.Assert.AreEqual(data.Length, outBuf.GetLength());
NUnit.Framework.Assert.IsTrue(buf.IsFlushed());
NUnit.Framework.Assert.AreEqual(0, buf.CountBufferedBytes());
// Write some more
buf.WriteRaw(data, 0, data.Length);
NUnit.Framework.Assert.AreEqual("Should count new data correctly", data.Length, buf
.CountBufferedBytes());
buf.SetReadyToFlush();
buf.FlushTo(outBuf);
NUnit.Framework.Assert.AreEqual(data.Length * 2, outBuf.GetLength());
NUnit.Framework.Assert.AreEqual(0, buf.CountBufferedBytes());
outBuf.Close();
}
/// <exception cref="System.IO.IOException"/>
public override void Close()
{
// EditLogOutputStream
// close should have been called after all pending transactions
// have been flushed & synced.
int size = doubleBuf.CountBufferedBytes();
if (size != 0)
{
throw new IOException("BackupEditStream has " + size + " records still to be flushed and cannot be closed."
);
}
RPC.StopProxy(backupNode);
// stop the RPC threads
doubleBuf.Close();
doubleBuf = null;
}