import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.RecordDeserializationException;
import org.apache.kafka.common.errors.WakeupException;
+import org.springframework.context.ConfigurableApplicationContext;
-import javax.annotation.PreDestroy;
import java.time.Duration;
import java.util.*;
-import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
-import java.util.concurrent.locks.Condition;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
@Slf4j
public class EndlessConsumer<K, V> implements Runnable
{
private final ExecutorService executor;
+ private final ConfigurableApplicationContext applicationContext;
private final String id;
private final String topic;
private final Consumer<K, V> consumer;
- private final PollIntervalAwareConsumerRebalanceListener pollIntervalAwareRebalanceListener;
- private final RecordHandler<K, V> handler;
+ private final ConsumerRebalanceListener rebalanceListener;
+ private final RecordHandler<K, V> recordHandler;
- private final Lock lock = new ReentrantLock();
- private final Condition condition = lock.newCondition();
private boolean running = false;
- private Exception exception;
+ private Exception exception = null;
private long consumed = 0;
try
{
log.info("{} - Subscribing to topic {}", id, topic);
- pollIntervalAwareRebalanceListener.enableCommits();
- consumer.subscribe(Arrays.asList(topic), pollIntervalAwareRebalanceListener);
+ consumer.subscribe(Arrays.asList(topic), rebalanceListener);
while (true)
{
record.value()
);
- handler.accept(record);
+ recordHandler.accept(record);
consumed++;
}
-
- pollIntervalAwareRebalanceListener.beforeNextPoll();
}
}
catch(WakeupException e)
{
log.info("{} - RIIING! Request to stop consumption - commiting current offsets!", id);
- shutdown();
}
catch(RecordDeserializationException e)
{
tp,
offset,
e.getCause().toString());
-
- shutdown(e);
+ this.exception = e;
}
catch(Exception e)
{
- log.error("{} - Unexpected error: {}, disabling commits", id, e.toString(), e);
- pollIntervalAwareRebalanceListener.disableCommits();
- shutdown(e);
+ log.error("{} - Unexpected error: {}", id, e.toString(), e);
+ this.exception = e;
}
finally
{
+ running = false;
+ log.info("{} - Closing the consumer...", id);
+ consumer.close();
+ log.info("{} - Shutting down the app...", id);
+ applicationContext.close();
log.info("{} - Consumer-Thread exiting", id);
}
}
- private void shutdown()
- {
- shutdown(null);
- }
-
- private void shutdown(Exception e)
- {
- lock.lock();
- try
- {
- try
- {
- log.info("{} - Unsubscribing from topic {}", id, topic);
- consumer.unsubscribe();
- }
- catch (Exception ue)
- {
- log.error(
- "{} - Error while unsubscribing from topic {}: {}",
- id,
- topic,
- ue.toString());
- }
- finally
- {
- running = false;
- exception = e;
- condition.signal();
- }
- }
- finally
- {
- lock.unlock();
- }
- }
-
public void start()
{
- lock.lock();
- try
- {
- if (running)
- throw new IllegalStateException("Consumer instance " + id + " is already running!");
+ if (running)
+ throw new IllegalStateException("Consumer instance " + id + " is already running!");
- log.info("{} - Starting - consumed {} messages before", id, consumed);
- running = true;
- exception = null;
- executor.submit(this);
- }
- finally
- {
- lock.unlock();
- }
- }
-
- public synchronized void stop() throws InterruptedException
- {
- 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();
- }
+ log.info("{} - Starting - consumed {} messages before", id, consumed);
+ running = true;
+ executor.submit(this);
}
- @PreDestroy
- public void destroy() throws ExecutionException, InterruptedException
+ public void stop()
{
- log.info("{} - Destroy!", id);
- log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
+ consumer.wakeup();
}
-
public boolean running()
{
- lock.lock();
- try
- {
- return running;
- }
- finally
- {
- lock.unlock();
- }
+ return running;
}
public Optional<Exception> exitStatus()
{
- lock.lock();
- try
- {
- if (running)
- throw new IllegalStateException("No exit-status available: Consumer instance " + id + " is running!");
+ if (running)
+ throw new IllegalStateException("No exit-status available: Consumer instance " + id + " is running!");
- return Optional.ofNullable(exception);
- }
- finally
- {
- lock.unlock();
- }
+ return Optional.ofNullable(exception);
}
}