| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.eagle.alert.engine.evaluator.impl; |
| |
| import org.apache.eagle.alert.engine.Collector; |
| import org.apache.eagle.alert.engine.coordinator.StreamDefinition; |
| import org.apache.eagle.alert.engine.evaluator.CompositePolicyHandler; |
| import org.apache.eagle.alert.engine.evaluator.PolicyHandlerContext; |
| import org.apache.eagle.alert.engine.model.AlertStreamEvent; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import io.siddhi.core.event.Event; |
| import io.siddhi.core.stream.output.StreamCallback; |
| |
| /** |
| * Created on 8/2/16. |
| */ |
| public class AlertStreamCallback extends StreamCallback { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(AlertStreamCallback.class); |
| private final String outputStream; |
| private final Collector<AlertStreamEvent> collector; |
| private final PolicyHandlerContext context; |
| private final StreamDefinition definition; |
| |
| private int currentIndex; |
| |
| public AlertStreamCallback(String outputStream, |
| StreamDefinition streamDefinition, |
| Collector<AlertStreamEvent> collector, |
| PolicyHandlerContext context, |
| int currentIndex) { |
| this.outputStream = outputStream; |
| this.collector = collector; |
| this.context = context; |
| this.definition = streamDefinition; |
| this.currentIndex = currentIndex; |
| } |
| |
| /** |
| * Possibly more than one event will be triggered for alerting. |
| */ |
| @Override |
| public void receive(Event[] events) { |
| String policyName = context.getPolicyDefinition().getName(); |
| String siteId = context.getPolicyDefinition().getSiteId(); |
| CompositePolicyHandler handler = ((PolicyGroupEvaluatorImpl) context.getPolicyEvaluator()).getPolicyHandler(policyName); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Generated {} alerts from policy '{}' in {}, index of definiton {} ", events.length, policyName, context.getPolicyEvaluatorId(), currentIndex); |
| } |
| for (Event e : events) { |
| AlertStreamEvent event = new AlertStreamEvent(); |
| event.setSiteId(siteId); |
| event.setTimestamp(e.getTimestamp()); |
| event.setData(e.getData()); |
| event.setStreamId(outputStream); |
| event.setPolicyId(context.getPolicyDefinition().getName()); |
| if (this.context.getPolicyEvaluator() != null) { |
| event.setCreatedBy(context.getPolicyEvaluator().getName()); |
| } |
| event.setCreatedTime(System.currentTimeMillis()); |
| event.setSchema(definition); |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Generate new alert event: {}", event); |
| } |
| try { |
| if (handler == null) { |
| // extreme case: the handler is removed from the evaluator. Just emit. |
| if (LOG.isDebugEnabled()) { |
| LOG.debug(" handler not found when callback received event, directly emit. policy removed? "); |
| } |
| collector.emit(event); |
| } else { |
| handler.send(event, currentIndex + 1); |
| } |
| } catch (Exception ex) { |
| LOG.error(String.format("send event %s to index %d failed with exception. ", event, currentIndex), ex); |
| } |
| } |
| context.getPolicyCounter().incrBy(String.format("%s.%s", this.context.getPolicyDefinition().getName(), "alert_count"), events.length); |
| } |
| } |