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

Example 6 with CanalInstance

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

the class GroupSpringInstanceTest method testInstance.

@Test
public void testInstance() {
    CanalInstanceGenerator generator = (CanalInstanceGenerator) context.getBean("canalInstanceGenerator");
    CanalInstance canalInstance = generator.generate("instance");
    Assert.notNull(canalInstance);
    canalInstance.start();
    try {
        Thread.sleep(10 * 1000);
    } catch (InterruptedException e) {
    }
    canalInstance.stop();
}

Example 7 with CanalInstance

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

the class CanalServerWithEmbedded method stop.

public void stop() {
    super.stop();
    for (Map.Entry<String, CanalInstance> entry : canalInstances.entrySet()) {
        try {
            CanalInstance instance = entry.getValue();
            if (instance.isStart()) {
                try {
                    String destination = entry.getKey();
                    MDC.put("destination", destination);
                    entry.getValue().stop();
                    logger.info("stop CanalInstances[{}] successfully", destination);
                } finally {
                    MDC.remove("destination");
                }
            }
        } catch (Exception e) {
            logger.error(String.format("stop CanalInstance[%s] has an error", entry.getKey()), e);
        }
    }
    metrics.terminate();
}

Example 8 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, Long batchId) 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
        PositionRange<LogPosition> positionRanges = canalInstance.getMetaManager().removeBatch(clientIdentity, batchId);
        if (positionRanges == null) {
            // 说明是重复的ack/rollback
            throw new CanalServerException(String.format("rollback error, clientId:%s batchId:%d is not exist , please check", clientIdentity.getClientId(), batchId));
        }
        // lastRollbackPostions.put(clientIdentity,
        // positionRanges.getEnd());// 记录一下最后rollback的位置
        // TODO 后续rollback到指定的batchId位置
        // rollback
        canalInstance.getEventStore().rollback();
        // eventStore中的状态信息
        logger.info("rollback successfully, clientId:{} batchId:{} position:{}", clientIdentity.getClientId(), batchId, positionRanges);
    }
}

Example 9 with CanalInstance

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

the class CanalServerWithEmbedded method subscribe.

/**
 * 客户端订阅，重复订阅时会更新对应的filter信息
 */
@Override
public void subscribe(ClientIdentity clientIdentity) throws CanalServerException {
    checkStart(clientIdentity.getDestination());
    CanalInstance canalInstance = canalInstances.get(clientIdentity.getDestination());
    if (!canalInstance.getMetaManager().isStart()) {
        canalInstance.getMetaManager().start();
    }
    // 执行一下meta订阅
    canalInstance.getMetaManager().subscribe(clientIdentity);
    Position position = canalInstance.getMetaManager().getCursor(clientIdentity);
    if (position == null) {
        // 获取一下store中的第一条
        position = canalInstance.getEventStore().getFirstPosition();
        if (position != null) {
            // 更新一下cursor
            canalInstance.getMetaManager().updateCursor(clientIdentity, position);
        }
        logger.info("subscribe successfully, {} with first position:{} ", clientIdentity, position);
    } else {
        logger.info("subscribe successfully, {} use last cursor position:{} ", clientIdentity, position);
    }
    // 通知下订阅关系变化
    canalInstance.subscribeChange(clientIdentity);
}

Example 10 with CanalInstance

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

the class CanalServerWithEmbedded method getWithoutAck.

/**
 * 不指定 position 获取事件。canal 会记住此 client 最新的 position。 <br/>
 * 如果是第一次 fetch，则会从 canal 中保存的最老一条数据开始输出。
 *
 * <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 getWithoutAck(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);
        Events<Event> events = null;
        if (positionRanges != null) {
            // 存在流数据
            events = getEvents(canalInstance.getEventStore(), positionRanges.getStart(), batchSize, timeout, unit);
        } else {
            // ack后第一次获取
            Position start = canalInstance.getMetaManager().getCursor(clientIdentity);
            if (start == null) {
                // 第一次，还没有过ack记录，则获取当前store中的第一条
                start = canalInstance.getEventStore().getFirstPosition();
            }
            events = getEvents(canalInstance.getEventStore(), start, batchSize, timeout, unit);
        }
        if (CollectionUtils.isEmpty(events.getEvents())) {
            // 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("getWithoutAck successfully, clientId:{} batchSize:{}  real size is {} and result is [batchId:{} , position:{}]", clientIdentity.getClientId(), batchSize, entrys.size(), batchId, events.getPositionRange());
            }
            return new Message(batchId, raw, entrys);
        }
    }
}