@Test
public void testRollback() throws Exception {
// put an item and commit
putEvents(channel, "rollback", 1, 50);
Transaction transaction;
// put an item we will rollback
transaction = channel.getTransaction();
transaction.begin();
channel.put(EventBuilder.withBody("this is going to be rolledback".getBytes(Charsets.UTF_8)));
transaction.rollback();
transaction.close();
// simulate crash
channel.stop();
channel = createFileChannel();
// get the item which was not rolled back
transaction = channel.getTransaction();
transaction.begin();
Event event = channel.take();
transaction.commit();
transaction.close();
Assert.assertNotNull(event);
Assert.assertEquals("rollback-0-0", new String(event.getBody(), Charsets.UTF_8));
}
private RecoverableMemoryChannel createFileChannel() {
RecoverableMemoryChannel channel = new RecoverableMemoryChannel();
context = new Context();
context.put(RecoverableMemoryChannel.WAL_DATA_DIR, dataDir.getAbsolutePath());
Configurables.configure(channel, context);
channel.start();
return channel;
}
@Test
public void testRollbackWithSink() throws Exception {
final NullSink nullSink = new NullSink();
Context ctx = new Context();
ctx.put("batchSize", "1");
nullSink.configure(ctx);
nullSink.setChannel(channel);
final int numItems = 99;
Thread t =
new Thread() {
@Override
public void run() {
int count = 0;
while (count++ < numItems) {
try {
nullSink.process();
Thread.sleep(1);
} catch (EventDeliveryException e) {
break;
} catch (Exception e) {
Throwables.propagate(e);
}
}
}
};
t.setDaemon(true);
t.setName("NullSink");
t.start();
putEvents(channel, "rollback", 10, 100);
Transaction transaction;
// put an item we will rollback
transaction = channel.getTransaction();
transaction.begin();
channel.put(EventBuilder.withBody("this is going to be rolledback".getBytes(Charsets.UTF_8)));
transaction.rollback();
transaction.close();
while (t.isAlive()) {
Thread.sleep(1);
}
// simulate crash
channel.stop();
channel = createFileChannel();
// get the item which was not rolled back
transaction = channel.getTransaction();
transaction.begin();
Event event = channel.take();
transaction.commit();
transaction.close();
Assert.assertNotNull(event);
Assert.assertEquals("rollback-90-9", new String(event.getBody(), Charsets.UTF_8));
}
@Test
public void testRestart() throws Exception {
List<String> in = Lists.newArrayList();
try {
while (true) {
in.addAll(putEvents(channel, "restart", 1, 1));
}
} catch (ChannelException e) {
Assert.assertEquals("Cannot acquire capacity", e.getMessage());
}
channel.stop();
channel = createFileChannel();
List<String> out = takeEvents(channel, 1, Integer.MAX_VALUE);
Collections.sort(in);
Collections.sort(out);
Assert.assertEquals(in, out);
}