(PullMessageRequestHeader) request.decodeCommandCustomHeader(PullMessageRequestHeader.class);
// 由于异步返回，所以必须要设置
response.setOpaque(request.getOpaque());
DefaultMQPullConsumer pullConsumer = this.filtersrvController.getDefaultMQPullConsumer();
final FilterClassInfo findFilterClass =
this.filtersrvController.getFilterClassManager().findFilterClass(
requestHeader.getConsumerGroup(), requestHeader.getTopic());
if (null == findFilterClass) {
response.setCode(ResponseCode.SYSTEM_ERROR);
response.setRemark("Find Filter class failed, not registered");
return response;
}
if (null == findFilterClass.getMessageFilter()) {
response.setCode(ResponseCode.SYSTEM_ERROR);
response.setRemark("Find Filter class failed, registered but no class");
return response;
}
responseHeader.setSuggestWhichBrokerId(MixAll.MASTER_ID);
// 构造从Broker拉消息的参数
MessageQueue mq = new MessageQueue();
mq.setTopic(requestHeader.getTopic());
mq.setQueueId(requestHeader.getQueueId());
mq.setBrokerName(this.filtersrvController.getBrokerName());
long offset = requestHeader.getQueueOffset();
int maxNums = requestHeader.getMaxMsgNums();
final PullCallback pullCallback = new PullCallback() {
@Override
public void onSuccess(PullResult pullResult) {
responseHeader.setMaxOffset(pullResult.getMaxOffset());
responseHeader.setMinOffset(pullResult.getMinOffset());
responseHeader.setNextBeginOffset(pullResult.getNextBeginOffset());
response.setRemark(null);
switch (pullResult.getPullStatus()) {
case FOUND:
response.setCode(ResponseCode.SUCCESS);
List<MessageExt> msgListOK = new ArrayList<MessageExt>();
try {
for (MessageExt msg : pullResult.getMsgFoundList()) {
boolean match = findFilterClass.getMessageFilter().match(msg);
if (match) {
msgListOK.add(msg);
}
}
// 有消息返回
if (!msgListOK.isEmpty()) {
returnResponse(requestHeader.getConsumerGroup(), requestHeader.getTopic(), ctx,
response, msgListOK);
return;
}
// 全部都被过滤掉了
else {
response.setCode(ResponseCode.PULL_RETRY_IMMEDIATELY);
}
}
// 只要抛异常，就终止过滤，并返回客户端异常
catch (Throwable e) {
final String error =
String.format("do Message Filter Exception, ConsumerGroup: %s Topic: %s ",
requestHeader.getConsumerGroup(), requestHeader.getTopic());
log.error(error, e);
response.setCode(ResponseCode.SYSTEM_ERROR);
response.setRemark(error + RemotingHelper.exceptionSimpleDesc(e));
returnResponse(requestHeader.getConsumerGroup(), requestHeader.getTopic(), ctx,
response, null);
return;
}
break;
case NO_MATCHED_MSG:
response.setCode(ResponseCode.PULL_RETRY_IMMEDIATELY);
break;
case NO_NEW_MSG:
response.setCode(ResponseCode.PULL_NOT_FOUND);
break;
case OFFSET_ILLEGAL:
response.setCode(ResponseCode.PULL_OFFSET_MOVED);
break;
default:
break;
}
returnResponse(requestHeader.getConsumerGroup(), requestHeader.getTopic(), ctx, response,
null);
}
@Override
public void onException(Throwable e) {
response.setCode(ResponseCode.SYSTEM_ERROR);
response.setRemark("Pull Callback Exception, " + RemotingHelper.exceptionSimpleDesc(e));
returnResponse(requestHeader.getConsumerGroup(), requestHeader.getTopic(), ctx, response,
null);
return;
}
};
pullConsumer.pullBlockIfNotFound(mq, null, offset, maxNums, pullCallback);
return null;
}