Examples with StreamEvent org.ballerinalang.siddhi.core.event.stream.StreamEvent used on opensource projects

Example 81 with StreamEvent

use of org.ballerinalang.siddhi.core.event.stream.StreamEvent in project ballerina by ballerina-lang.

the class ExternalTimeBatchWindowProcessor method process.

/**
 * Here an assumption is taken:
 * Parameter: timestamp: The time which the window determines as current time and will act upon,
 * the value of this parameter should be monotonically increasing.
 * from https://docs.wso2.com/display/CEP400/Inbuilt+Windows#InbuiltWindows-externalTime
 */
@Override
protected void process(ComplexEventChunk<StreamEvent> streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner) {
    // event incoming trigger process. No events means no action
    if (streamEventChunk.getFirst() == null) {
        return;
    }
    List<ComplexEventChunk<StreamEvent>> complexEventChunks = new ArrayList<ComplexEventChunk<StreamEvent>>();
    synchronized (this) {
        initTiming(streamEventChunk.getFirst());
        StreamEvent nextStreamEvent = streamEventChunk.getFirst();
        while (nextStreamEvent != null) {
            StreamEvent currStreamEvent = nextStreamEvent;
            nextStreamEvent = nextStreamEvent.getNext();
            if (currStreamEvent.getType() == ComplexEvent.Type.TIMER) {
                if (lastScheduledTime <= currStreamEvent.getTimestamp()) {
                    // implies that there have not been any more events after this schedule has been done.
                    if (!flushed) {
                        flushToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, true);
                        flushed = true;
                    } else {
                        if (currentEventChunk.getFirst() != null) {
                            appendToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, true);
                        }
                    }
                    // rescheduling to emit the current batch after expiring it if no further events arrive.
                    lastScheduledTime = siddhiAppContext.getTimestampGenerator().currentTime() + schedulerTimeout;
                    scheduler.notifyAt(lastScheduledTime);
                }
                continue;
            } else if (currStreamEvent.getType() != ComplexEvent.Type.CURRENT) {
                continue;
            }
            long currentEventTime = (Long) timestampExpressionExecutor.execute(currStreamEvent);
            if (lastCurrentEventTime < currentEventTime) {
                lastCurrentEventTime = currentEventTime;
            }
            if (currentEventTime < endTime) {
                cloneAppend(streamEventCloner, currStreamEvent);
            } else {
                if (flushed) {
                    appendToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, false);
                    flushed = false;
                } else {
                    flushToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, false);
                }
                // update timestamp, call next processor
                endTime = findEndTime(lastCurrentEventTime, startTime, timeToKeep);
                cloneAppend(streamEventCloner, currStreamEvent);
                // triggering the last batch expiration.
                if (schedulerTimeout > 0) {
                    lastScheduledTime = siddhiAppContext.getTimestampGenerator().currentTime() + schedulerTimeout;
                    scheduler.notifyAt(lastScheduledTime);
                }
            }
        }
    }
    for (ComplexEventChunk<StreamEvent> complexEventChunk : complexEventChunks) {
        nextProcessor.process(complexEventChunk);
    }
}

Example 82 with StreamEvent

use of org.ballerinalang.siddhi.core.event.stream.StreamEvent in project ballerina by ballerina-lang.

the class ExternalTimeBatchWindowProcessor method cloneAppend.

private void cloneAppend(StreamEventCloner streamEventCloner, StreamEvent currStreamEvent) {
    StreamEvent clonedStreamEvent = streamEventCloner.copyStreamEvent(currStreamEvent);
    if (replaceTimestampWithBatchEndTime) {
        clonedStreamEvent.setAttribute(endTime, timestampExpressionExecutor.getPosition());
    }
    currentEventChunk.add(clonedStreamEvent);
    if (resetEvent == null) {
        resetEvent = streamEventCloner.copyStreamEvent(currStreamEvent);
        resetEvent.setType(ComplexEvent.Type.RESET);
    }
}

Example 83 with StreamEvent

use of org.ballerinalang.siddhi.core.event.stream.StreamEvent in project ballerina by ballerina-lang.

the class ExternalTimeBatchWindowProcessor method appendToOutputChunk.

private void appendToOutputChunk(StreamEventCloner streamEventCloner, List<ComplexEventChunk<StreamEvent>> complexEventChunks, long currentTime, boolean preserveCurrentEvents) {
    ComplexEventChunk<StreamEvent> newEventChunk = new ComplexEventChunk<StreamEvent>(true);
    ComplexEventChunk<StreamEvent> sentEventChunk = new ComplexEventChunk<StreamEvent>(true);
    if (currentEventChunk.getFirst() != null) {
        if (expiredEventChunk.getFirst() != null) {
            // mark the timestamp for the expiredType event
            expiredEventChunk.reset();
            while (expiredEventChunk.hasNext()) {
                StreamEvent expiredEvent = expiredEventChunk.next();
                if (outputExpectsExpiredEvents) {
                    // add expired event to newEventChunk.
                    StreamEvent toExpireEvent = streamEventCloner.copyStreamEvent(expiredEvent);
                    toExpireEvent.setTimestamp(currentTime);
                    newEventChunk.add(toExpireEvent);
                }
                StreamEvent toSendEvent = streamEventCloner.copyStreamEvent(expiredEvent);
                toSendEvent.setType(ComplexEvent.Type.CURRENT);
                sentEventChunk.add(toSendEvent);
            }
        }
        // add reset event in front of current events
        StreamEvent toResetEvent = streamEventCloner.copyStreamEvent(resetEvent);
        toResetEvent.setTimestamp(currentTime);
        newEventChunk.add(toResetEvent);
        // add old events
        newEventChunk.add(sentEventChunk.getFirst());
        // move to expired events
        if (preserveCurrentEvents || storeExpiredEvents) {
            currentEventChunk.reset();
            while (currentEventChunk.hasNext()) {
                StreamEvent currentEvent = currentEventChunk.next();
                StreamEvent toExpireEvent = streamEventCloner.copyStreamEvent(currentEvent);
                toExpireEvent.setType(StreamEvent.Type.EXPIRED);
                expiredEventChunk.add(toExpireEvent);
            }
        }
        // add current event chunk to next processor
        newEventChunk.add(currentEventChunk.getFirst());
    }
    currentEventChunk.clear();
    if (newEventChunk.getFirst() != null) {
        complexEventChunks.add(newEventChunk);
    }
}

Example 84 with StreamEvent

use of org.ballerinalang.siddhi.core.event.stream.StreamEvent in project ballerina by ballerina-lang.

the class ExternalTimeWindowProcessor method process.

@Override
protected synchronized void process(ComplexEventChunk<StreamEvent> streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner) {
    synchronized (this) {
        while (streamEventChunk.hasNext()) {
            StreamEvent streamEvent = streamEventChunk.next();
            long currentTime = (Long) timeStampVariableExpressionExecutor.execute(streamEvent);
            StreamEvent clonedEvent = streamEventCloner.copyStreamEvent(streamEvent);
            clonedEvent.setType(StreamEvent.Type.EXPIRED);
            // reset expiredEventChunk to make sure all of the expired events get removed,
            // otherwise lastReturned.next will always return null and here while check is always false
            expiredEventChunk.reset();
            while (expiredEventChunk.hasNext()) {
                StreamEvent expiredEvent = expiredEventChunk.next();
                long expiredEventTime = (Long) timeStampVariableExpressionExecutor.execute(expiredEvent);
                long timeDiff = expiredEventTime - currentTime + timeToKeep;
                if (timeDiff <= 0) {
                    expiredEventChunk.remove();
                    expiredEvent.setTimestamp(currentTime);
                    streamEventChunk.insertBeforeCurrent(expiredEvent);
                } else {
                    expiredEventChunk.reset();
                    break;
                }
            }
            if (streamEvent.getType() == StreamEvent.Type.CURRENT) {
                this.expiredEventChunk.add(clonedEvent);
            }
            expiredEventChunk.reset();
        }
    }
    nextProcessor.process(streamEventChunk);
}

Example 85 with StreamEvent

use of org.ballerinalang.siddhi.core.event.stream.StreamEvent in project ballerina by ballerina-lang.

the class FrequentWindowProcessor method process.

@Override
protected void process(ComplexEventChunk<StreamEvent> streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner) {
    synchronized (this) {
        StreamEvent streamEvent = streamEventChunk.getFirst();
        streamEventChunk.clear();
        long currentTime = siddhiAppContext.getTimestampGenerator().currentTime();
        while (streamEvent != null) {
            StreamEvent next = streamEvent.getNext();
            streamEvent.setNext(null);
            StreamEvent clonedEvent = streamEventCloner.copyStreamEvent(streamEvent);
            clonedEvent.setType(StreamEvent.Type.EXPIRED);
            String key = generateKey(streamEvent);
            StreamEvent oldEvent = map.put(key, clonedEvent);
            if (oldEvent != null) {
                countMap.put(key, countMap.get(key) + 1);
                streamEventChunk.add(streamEvent);
            } else {
                // This is a new event
                if (map.size() > mostFrequentCount) {
                    List<String> keys = new ArrayList<String>(countMap.keySet());
                    for (int i = 0; i < mostFrequentCount; i++) {
                        int count = countMap.get(keys.get(i)) - 1;
                        if (count == 0) {
                            countMap.remove(keys.get(i));
                            StreamEvent expiredEvent = map.remove(keys.get(i));
                            expiredEvent.setTimestamp(currentTime);
                            streamEventChunk.add(expiredEvent);
                        } else {
                            countMap.put(keys.get(i), count);
                        }
                    }
                    // now we have tried to remove one for newly added item
                    if (map.size() > mostFrequentCount) {
                        // nothing happend by the attempt to remove one from the
                        // map so we are ignoring this event
                        map.remove(key);
                    // Here we do nothing just drop the message
                    } else {
                        // we got some space, event is already there in map object
                        // we just have to add it to the countMap
                        countMap.put(key, 1);
                        streamEventChunk.add(streamEvent);
                    }
                } else {
                    countMap.put(generateKey(streamEvent), 1);
                    streamEventChunk.add(streamEvent);
                }
            }
            streamEvent = next;
        }
    }
    nextProcessor.process(streamEventChunk);
}