import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
-import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
@Slf4j
private final String topic;
private final String autoOffsetReset;
- private AtomicBoolean running = new AtomicBoolean();
+ private final Lock lock = new ReentrantLock();
+ private final Condition condition = lock.newCondition();
+ private boolean running = false;
+ private Exception exception;
private long consumed = 0;
private KafkaConsumer<String, String> consumer = null;
- private Future<?> future = null;
- private final Map<Integer, Map<String, Integer>> seen = new HashMap<>();
+
+ private final Map<Integer, Map<String, Long>> seen = new HashMap<>();
public EndlessConsumer(
partitions.forEach(tp ->
{
log.info("{} - removing partition: {}", id, tp);
- Map<String, Integer> removed = seen.remove(tp.partition());
+ Map<String, Long> removed = seen.remove(tp.partition());
for (String key : removed.keySet())
{
log.info(
"{} - Seen {} messages for partition={}|key={}",
id,
removed.get(key),
- removed,
+ tp.partition(),
key);
}
});
Integer partition = record.partition();
String key = record.key() == null ? "NULL" : record.key();
- Map<String, Integer> byKey = seen.get(partition);
+ Map<String, Long> byKey = seen.get(partition);
if (!byKey.containsKey(key))
- byKey.put(key, 0);
+ byKey.put(key, 0l);
- int seenByKey = byKey.get(key);
+ long seenByKey = byKey.get(key);
seenByKey++;
byKey.put(key, seenByKey);
}
catch(WakeupException e)
{
log.info("{} - RIIING!", id);
+ shutdown();
}
catch(Exception e)
{
log.error("{} - Unexpected error: {}", id, e.toString(), e);
- running.set(false); // Mark the instance as not running
+ shutdown(e);
}
finally
{
}
}
- public Map<Integer, Map<String, Integer>> getSeen()
+ private void shutdown()
+ {
+ shutdown(null);
+ }
+
+ private void shutdown(Exception e)
+ {
+ lock.lock();
+ try
+ {
+ running = false;
+ exception = e;
+ condition.signal();
+ }
+ finally
+ {
+ lock.unlock();
+ }
+ }
+
+ public Map<Integer, Map<String, Long>> getSeen()
{
return seen;
}
- public synchronized void start()
+ public void start()
{
- boolean stateChanged = running.compareAndSet(false, true);
- if (!stateChanged)
- throw new RuntimeException("Consumer instance " + id + " is already running!");
+ lock.lock();
+ try
+ {
+ if (running)
+ throw new IllegalStateException("Consumer instance " + id + " is already running!");
- log.info("{} - Starting - consumed {} messages before", id, consumed);
- future = executor.submit(this);
+ log.info("{} - Starting - consumed {} messages before", id, consumed);
+ running = true;
+ exception = null;
+ executor.submit(this);
+ }
+ finally
+ {
+ lock.unlock();
+ }
}
public synchronized void stop() throws ExecutionException, InterruptedException
{
- boolean stateChanged = running.compareAndSet(true, false);
- if (!stateChanged)
- throw new RuntimeException("Consumer instance " + id + " is not running!");
-
- log.info("{} - Stopping", id);
- consumer.wakeup();
- future.get();
- log.info("{} - Stopped - consumed {} messages so far", id, consumed);
+ lock.lock();
+ try
+ {
+ if (!running)
+ throw new IllegalStateException("Consumer instance " + id + " is not running!");
+
+ log.info("{} - Stopping", id);
+ consumer.wakeup();
+ condition.await();
+ log.info("{} - Stopped - consumed {} messages so far", id, consumed);
+ }
+ finally
+ {
+ lock.unlock();
+ }
}
@PreDestroy
{
log.info("{} - Was already stopped", id);
}
+ catch (Exception e)
+ {
+ log.error("{} - Unexpected exception while trying to stop the consumer", id, e);
+ }
finally
{
log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
}
}
+
+ public boolean running()
+ {
+ lock.lock();
+ try
+ {
+ return running;
+ }
+ finally
+ {
+ lock.unlock();
+ }
+ }
+
+ public Optional<Exception> exitStatus()
+ {
+ lock.lock();
+ try
+ {
+ if (running)
+ throw new IllegalStateException("No exit-status available: Consumer instance " + id + " is running!");
+
+ return Optional.ofNullable(exception);
+ }
+ finally
+ {
+ lock.unlock();
+ }
+ }
}