public List queryMessageByTopic()

in src/main/java/org/apache/rocketmq/dashboard/service/impl/MessageServiceImpl.java [124:194]
70 lines of code
16 McCabe index (conditional complexity)

    public List<MessageView> queryMessageByTopic(String topic, final long begin, final long end) {
        boolean isEnableAcl = !StringUtils.isEmpty(configure.getAccessKey()) && !StringUtils.isEmpty(configure.getSecretKey());
        RPCHook rpcHook = null;
        if (isEnableAcl) {
            rpcHook = new AclClientRPCHook(new SessionCredentials(configure.getAccessKey(), configure.getSecretKey()));
        }
        DefaultMQPullConsumer consumer = buildDefaultMQPullConsumer(rpcHook, configure.isUseTLS());
        List<MessageView> messageViewList = Lists.newArrayList();
        try {
            String subExpression = "*";
            consumer.start();
            Set<MessageQueue> mqs = consumer.fetchSubscribeMessageQueues(topic);
            for (MessageQueue mq : mqs) {
                long minOffset = consumer.searchOffset(mq, begin);
                long maxOffset = consumer.searchOffset(mq, end);
                READQ:
                for (long offset = minOffset; offset <= maxOffset; ) {
                    try {
                        if (messageViewList.size() > 2000) {
                            break;
                        }
                        PullResult pullResult = consumer.pull(mq, subExpression, offset, 32);
                        offset = pullResult.getNextBeginOffset();
                        switch (pullResult.getPullStatus()) {
                            case FOUND:

                                List<MessageView> messageViewListByQuery = Lists.transform(pullResult.getMsgFoundList(), new Function<MessageExt, MessageView>() {
                                    @Override
                                    public MessageView apply(MessageExt messageExt) {
                                        messageExt.setBody(null);
                                        return MessageView.fromMessageExt(messageExt);
                                    }
                                });
                                List<MessageView> filteredList = Lists.newArrayList(Iterables.filter(messageViewListByQuery, new Predicate<MessageView>() {
                                    @Override
                                    public boolean apply(MessageView messageView) {
                                        if (messageView.getStoreTimestamp() < begin || messageView.getStoreTimestamp() > end) {
                                            logger.info("begin={} end={} time not in range {} {}", begin, end, messageView.getStoreTimestamp(), new Date(messageView.getStoreTimestamp()).toString());
                                        }
                                        return messageView.getStoreTimestamp() >= begin && messageView.getStoreTimestamp() <= end;
                                    }
                                }));
                                messageViewList.addAll(filteredList);
                                break;
                            case NO_MATCHED_MSG:
                            case NO_NEW_MSG:
                            case OFFSET_ILLEGAL:
                                break READQ;
                        }
                    } catch (Exception e) {
                        break;
                    }
                }
            }
            Collections.sort(messageViewList, new Comparator<MessageView>() {
                @Override
                public int compare(MessageView o1, MessageView o2) {
                    if (o1.getStoreTimestamp() - o2.getStoreTimestamp() == 0) {
                        return 0;
                    }
                    return (o1.getStoreTimestamp() > o2.getStoreTimestamp()) ? -1 : 1;
                }
            });
            return messageViewList;
        } catch (Exception e) {
            Throwables.throwIfUnchecked(e);
            throw new RuntimeException(e);
        } finally {
            consumer.shutdown();
        }
    }