Examples with CanalInstance com.alibaba.otter.canal.instance.core.CanalInstance used on opensource projects

Example 16 with CanalInstance

use of com.alibaba.otter.canal.instance.core.CanalInstance in project canal by alibaba.

the class CanalServerWithEmbedded method stop.

public void stop(String destination) {
    CanalInstance canalInstance = canalInstances.remove(destination);
    if (canalInstance != null) {
        if (canalInstance.isStart()) {
            try {
                MDC.put("destination", destination);
                canalInstance.stop();
                if (metrics.isRunning()) {
                    metrics.unregister(canalInstance);
                }
                logger.info("stop CanalInstances[{}] successfully", destination);
            } finally {
                MDC.remove("destination");
            }
        }
    }
}

Example 17 with CanalInstance

use of com.alibaba.otter.canal.instance.core.CanalInstance in project canal by alibaba.

the class CanalServerWithEmbedded method start.

public void start(final String destination) {
    final CanalInstance canalInstance = canalInstances.get(destination);
    if (!canalInstance.isStart()) {
        try {
            MDC.put("destination", destination);
            if (metrics.isRunning()) {
                metrics.register(canalInstance);
            }
            canalInstance.start();
            logger.info("start CanalInstances[{}] successfully", destination);
        } finally {
            MDC.remove("destination");
        }
    }
}

Example 18 with CanalInstance

use of com.alibaba.otter.canal.instance.core.CanalInstance in project canal by alibaba.

the class CanalServerWithEmbedded method checkSubscribe.

private void checkSubscribe(ClientIdentity clientIdentity) {
    CanalInstance canalInstance = canalInstances.get(clientIdentity.getDestination());
    boolean hasSubscribe = canalInstance.getMetaManager().hasSubscribe(clientIdentity);
    if (!hasSubscribe) {
        throw new CanalServerException(String.format("ClientIdentity:%s should subscribe first", clientIdentity.toString()));
    }
}

Example 19 with CanalInstance

use of com.alibaba.otter.canal.instance.core.CanalInstance in project canal by alibaba.

the class CanalServerWithEmbedded method rollback.

/**
 * 回滚到未进行 {@link #ack} 的地方，下次fetch的时候，可以从最后一个没有 {@link #ack} 的地方开始拿
 */
@Override
public void rollback(ClientIdentity clientIdentity) throws CanalServerException {
    checkStart(clientIdentity.getDestination());
    CanalInstance canalInstance = canalInstances.get(clientIdentity.getDestination());
    // 因为存在第一次链接时自动rollback的情况，所以需要忽略未订阅
    boolean hasSubscribe = canalInstance.getMetaManager().hasSubscribe(clientIdentity);
    if (!hasSubscribe) {
        return;
    }
    synchronized (canalInstance) {
        // 清除batch信息
        canalInstance.getMetaManager().clearAllBatchs(clientIdentity);
        // rollback eventStore中的状态信息
        canalInstance.getEventStore().rollback();
        logger.info("rollback successfully, clientId:{}", new Object[] { clientIdentity.getClientId() });
    }
}

Example 20 with CanalInstance

use of com.alibaba.otter.canal.instance.core.CanalInstance in project canal by alibaba.

the class CanalServerWithEmbedded method get.

/**
 * 获取数据，可以指定超时时间.
 *
 * <pre>
 * 几种case:
 * a. 如果timeout为null，则采用tryGet方式，即时获取
 * b. 如果timeout不为null
 *    1. timeout为0，则采用get阻塞方式，获取数据，不设置超时，直到有足够的batchSize数据才返回
 *    2. timeout不为0，则采用get+timeout方式，获取数据，超时还没有batchSize足够的数据，有多少返回多少
 *
 * 注意： meta获取和数据的获取需要保证顺序性，优先拿到meta的，一定也会是优先拿到数据，所以需要加同步. (不能出现先拿到meta，拿到第二批数据，这样就会导致数据顺序性出现问题)
 * </pre>
 */
@Override
public Message get(ClientIdentity clientIdentity, int batchSize, Long timeout, TimeUnit unit) throws CanalServerException {
    checkStart(clientIdentity.getDestination());
    checkSubscribe(clientIdentity);
    CanalInstance canalInstance = canalInstances.get(clientIdentity.getDestination());
    synchronized (canalInstance) {
        // 获取到流式数据中的最后一批获取的位置
        PositionRange<LogPosition> positionRanges = canalInstance.getMetaManager().getLastestBatch(clientIdentity);
        if (positionRanges != null) {
            throw new CanalServerException(String.format("clientId:%s has last batch:[%s] isn't ack , maybe loss data", clientIdentity.getClientId(), positionRanges));
        }
        Events<Event> events = null;
        Position start = canalInstance.getMetaManager().getCursor(clientIdentity);
        events = getEvents(canalInstance.getEventStore(), start, batchSize, timeout, unit);
        if (CollectionUtils.isEmpty(events.getEvents())) {
            logger.debug("get successfully, clientId:{} batchSize:{} but result is null", clientIdentity.getClientId(), batchSize);
            // 返回空包，避免生成batchId，浪费性能
            return new Message(-1, true, new ArrayList());
        } else {
            // 记录到流式信息
            Long batchId = canalInstance.getMetaManager().addBatch(clientIdentity, events.getPositionRange());
            boolean raw = isRaw(canalInstance.getEventStore());
            List entrys = null;
            if (raw) {
                entrys = Lists.transform(events.getEvents(), Event::getRawEntry);
            } else {
                entrys = Lists.transform(events.getEvents(), Event::getEntry);
            }
            if (logger.isInfoEnabled()) {
                logger.info("get successfully, clientId:{} batchSize:{} real size is {} and result is [batchId:{} , position:{}]", clientIdentity.getClientId(), batchSize, entrys.size(), batchId, events.getPositionRange());
            }
            // 直接提交ack
            ack(clientIdentity, batchId);
            return new Message(batchId, raw, entrys);
        }
    }
}