/**
* Using the given {@code appender}'s {@link Appender#append(LogSegment, ByteBuffer)} function,
* tests for various cases for append operations.
*
* @param appender the {@link Appender} to use
* @throws IOException
*/
private void doAppendTest(Appender appender) throws IOException {
String currSegmentName = "log_current";
LogSegment segment = getSegment(currSegmentName, STANDARD_SEGMENT_SIZE, true);
try {
long writeStartOffset = segment.getStartOffset();
byte[] bufOne = TestUtils.getRandomBytes(STANDARD_SEGMENT_SIZE / 2);
byte[] bufTwo = TestUtils.getRandomBytes(STANDARD_SEGMENT_SIZE / 3);
appender.append(segment, ByteBuffer.wrap(bufOne));
assertEquals(
"End offset is not as expected",
writeStartOffset + bufOne.length,
segment.getEndOffset());
appender.append(segment, ByteBuffer.wrap(bufTwo));
assertEquals(
"End offset is not as expected",
writeStartOffset + bufOne.length + bufTwo.length,
segment.getEndOffset());
// try to do a write that won't fit
ByteBuffer failBuf =
ByteBuffer.wrap(
TestUtils.getRandomBytes((int) (STANDARD_SEGMENT_SIZE - writeStartOffset + 1)));
long writeOverFlowCount = metrics.overflowWriteError.getCount();
try {
appender.append(segment, failBuf);
fail("Append should have failed because data won't fit in the segment");
} catch (IllegalArgumentException e) {
assertEquals(
"Write overflow should have been reported",
writeOverFlowCount + 1,
metrics.overflowWriteError.getCount());
assertEquals("Position of buffer has changed", 0, failBuf.position());
}
// read and ensure data matches
readAndEnsureMatch(segment, writeStartOffset, bufOne);
readAndEnsureMatch(segment, writeStartOffset + bufOne.length, bufTwo);
segment.close();
// ensure that append fails.
ByteBuffer buffer = ByteBuffer.wrap(TestUtils.getRandomBytes(1));
try {
appender.append(segment, buffer);
fail("Append should have failed because segments are closed");
} catch (ClosedChannelException e) {
assertEquals("Position of buffer has changed", 0, buffer.position());
}
} finally {
closeSegmentAndDeleteFile(segment);
}
}