How to use

getMaxOffset

method

in

org.apache.rocketmq.store.CommitLog

@Override
public long getMaxPhyOffset() {
  return this.commitLog.getMaxOffset();
}

public long behind() {
  return DefaultMessageStore.this.commitLog.getMaxOffset() - this.reputFromOffset;
}

private boolean isCommitLogAvailable() {
  return this.reputFromOffset < DefaultMessageStore.this.commitLog.getMaxOffset();
}

@Override
public long slaveFallBehindMuch() {
  return this.commitLog.getMaxOffset() - this.haService.getPush2SlaveMaxOffset().get();
}

@Override
public void shutdown() {
  for (int i = 0; i < 50 && this.isCommitLogAvailable(); i++) {
    try {
      Thread.sleep(100);
    } catch (InterruptedException ignored) {
    }
  }
  if (this.isCommitLogAvailable()) {
    log.warn("shutdown ReputMessageService, but commitlog have not finish to be dispatched, CL: {} reputFromOffset: {}",
      DefaultMessageStore.this.commitLog.getMaxOffset(), this.reputFromOffset);
  }
  super.shutdown();
}

/**
 * @throws Exception
 */
public void start() throws Exception {
  lock = lockFile.getChannel().tryLock(0, 1, false);
  if (lock == null || lock.isShared() || !lock.isValid()) {
    throw new RuntimeException("Lock failed,MQ already started");
  }
  lockFile.getChannel().write(ByteBuffer.wrap("lock".getBytes()));
  lockFile.getChannel().force(true);
  this.flushConsumeQueueService.start();
  this.commitLog.start();
  this.storeStatsService.start();
  if (this.scheduleMessageService != null && SLAVE != messageStoreConfig.getBrokerRole()) {
    this.scheduleMessageService.start();
  }
  if (this.getMessageStoreConfig().isDuplicationEnable()) {
    this.reputMessageService.setReputFromOffset(this.commitLog.getConfirmOffset());
  } else {
    this.reputMessageService.setReputFromOffset(this.commitLog.getMaxOffset());
  }
  this.reputMessageService.start();
  this.haService.start();
  this.createTempFile();
  this.addScheduleTask();
  this.shutdown = false;
}

@Override
public boolean checkInDiskByConsumeOffset(final String topic, final int queueId, long consumeOffset) {
  final long maxOffsetPy = this.commitLog.getMaxOffset();
  ConsumeQueue consumeQueue = findConsumeQueue(topic, queueId);
  if (consumeQueue != null) {
    SelectMappedBufferResult bufferConsumeQueue = consumeQueue.getIndexBuffer(consumeOffset);
    if (bufferConsumeQueue != null) {
      try {
        for (int i = 0; i < bufferConsumeQueue.getSize(); ) {
          i += ConsumeQueue.CQ_STORE_UNIT_SIZE;
          long offsetPy = bufferConsumeQueue.getByteBuffer().getLong();
          return checkInDiskByCommitOffset(offsetPy, maxOffsetPy);
        }
      } finally {
        bufferConsumeQueue.release();
      }
    } else {
      return false;
    }
  }
  return false;
}

long masterOffset = HAConnection.this.haService.getDefaultMessageStore().getCommitLog().getMaxOffset();
masterOffset =
  masterOffset

@Override
public long getMaxPhyOffset() {
  return this.commitLog.getMaxOffset();
}

private boolean isCommitLogAvailable() {
  return this.reputFromOffset < DefaultMessageStore.this.commitLog.getMaxOffset();
}

public long behind() {
  return DefaultMessageStore.this.commitLog.getMaxOffset() - this.reputFromOffset;
}

@Override
public long slaveFallBehindMuch() {
  return this.commitLog.getMaxOffset() - this.haService.getPush2SlaveMaxOffset().get();
}

final long maxOffsetPy = this.commitLog.getMaxOffset();

@Override
public void shutdown() {
  for (int i = 0; i < 50 && this.isCommitLogAvailable(); i++) {
    try {
      Thread.sleep(100);
    } catch (InterruptedException ignored) {
    }
  }
  if (this.isCommitLogAvailable()) {
    log.warn("shutdown ReputMessageService, but commitlog have not finish to be dispatched, CL: {} reputFromOffset: {}",
      DefaultMessageStore.this.commitLog.getMaxOffset(), this.reputFromOffset);
  }
  super.shutdown();
}

@Override
public boolean checkInDiskByConsumeOffset(final String topic, final int queueId, long consumeOffset) {
  final long maxOffsetPy = this.commitLog.getMaxOffset();
  ConsumeQueue consumeQueue = findConsumeQueue(topic, queueId);
  if (consumeQueue != null) {
    SelectMappedBufferResult bufferConsumeQueue = consumeQueue.getIndexBuffer(consumeOffset);
    if (bufferConsumeQueue != null) {
      try {
        for (int i = 0; i < bufferConsumeQueue.getSize(); ) {
          i += ConsumeQueue.CQ_STORE_UNIT_SIZE;
          long offsetPy = bufferConsumeQueue.getByteBuffer().getLong();
          return checkInDiskByCommitOffset(offsetPy, maxOffsetPy);
        }
      } finally {
        bufferConsumeQueue.release();
      }
    } else {
      return false;
    }
  }
  return false;
}

/**
 * @throws Exception
 */
public void start() throws Exception {
  lock = lockFile.getChannel().tryLock(0, 1, false);
  if (lock == null || lock.isShared() || !lock.isValid()) {
    throw new RuntimeException("Lock failed,MQ already started");
  }
  lockFile.getChannel().write(ByteBuffer.wrap("lock".getBytes()));
  lockFile.getChannel().force(true);
  this.flushConsumeQueueService.start();
  this.commitLog.start();
  this.storeStatsService.start();
  if (this.scheduleMessageService != null && BrokerRole.SLAVE != messageStoreConfig.getBrokerRole()) {
    this.scheduleMessageService.start();
  }
  if (this.getMessageStoreConfig().isDuplicationEnable()) {
    this.reputMessageService.setReputFromOffset(this.commitLog.getConfirmOffset());
  } else {
    this.reputMessageService.setReputFromOffset(this.commitLog.getMaxOffset());
  }
  this.reputMessageService.start();
  this.haService.start();
  this.createTempFile();
  this.addScheduleTask();
  if (BrokerRole.SLAVE != messageStoreConfig.getBrokerRole()) {
    this.haService.initInSyncOffset(getMaxPhyOffset());
  }
  this.shutdown = false;
}

long masterOffset = HAConnection.this.haService.getDefaultMessageStore().getCommitLog().getMaxOffset();
masterOffset =
  masterOffset

public boolean onRoleChange() {
  if (this.scheduleMessageService == null) {
    log.warn("scheduleMessageService is null");
    return false;
  }
  scheduleMessageService.load();
  if (BrokerRole.SLAVE != messageStoreConfig.getBrokerRole()) {
    this.scheduleMessageService.start();
    this.recoverTopicQueueTable();
    this.haService.initInSyncOffset(getMaxPhyOffset());
  } else {
    this.scheduleMessageService.shutdown();
    truncateNotSync();
    if (this.getMessageStoreConfig().isDuplicationEnable()) {
      this.reputMessageService.setReputFromOffset(this.commitLog.getConfirmOffset());
    } else {
      this.reputMessageService.setReputFromOffset(this.commitLog.getMaxOffset());
    }
  }
  log.info("role change, current role:{}", messageStoreConfig.getBrokerRole());
  return true;
}

final long maxOffsetPy = this.commitLog.getMaxOffset();

@Override
public long slaveFallBehindMuch() {
  return this.commitLog.getMaxOffset() - this.haService.getPush2SlaveMaxOffset().get();
}