| /* |
| * 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 |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * 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.iotdb.trigger; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.db.engine.trigger.api.Trigger; |
| import org.apache.iotdb.db.engine.trigger.sink.local.LocalIoTDBConfiguration; |
| import org.apache.iotdb.db.engine.trigger.sink.local.LocalIoTDBEvent; |
| import org.apache.iotdb.db.engine.trigger.sink.local.LocalIoTDBHandler; |
| import org.apache.iotdb.db.engine.trigger.sink.mqtt.MQTTConfiguration; |
| import org.apache.iotdb.db.engine.trigger.sink.mqtt.MQTTEvent; |
| import org.apache.iotdb.db.engine.trigger.sink.mqtt.MQTTHandler; |
| import org.apache.iotdb.db.utils.windowing.configuration.SlidingSizeWindowConfiguration; |
| import org.apache.iotdb.db.utils.windowing.handler.SlidingSizeWindowEvaluationHandler; |
| import org.apache.iotdb.trigger.api.TriggerAttributes; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| |
| import org.fusesource.mqtt.client.QoS; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class TriggerExample implements Trigger { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(TriggerExample.class); |
| |
| private static final String TARGET_DEVICE = "root.alerting"; |
| |
| private final LocalIoTDBHandler localIoTDBHandler = new LocalIoTDBHandler(); |
| private final MQTTHandler mqttHandler = new MQTTHandler(); |
| |
| // This field is required when the target MQTT server is current IoTDB. |
| // When IoTDB restarts, the registered triggers will be restored before starting the MQTT service. |
| // For this trigger, if openSinkHandlers() is called in onCreate(), IoTDB server will be stuck |
| // in openSinkHandlers when recovering, because it can't connect to the MQTT server (not started |
| // yet). |
| // See IOTDB-2274 for more detail. |
| private volatile boolean isSinksOpenedAfterCreation = false; |
| |
| private SlidingSizeWindowEvaluationHandler windowEvaluationHandler; |
| |
| @Override |
| public void onCreate(TriggerAttributes attributes) throws Exception { |
| LOGGER.info("onCreate(TriggerAttributes attributes)"); |
| |
| double lo = attributes.getDouble("lo"); |
| double hi = attributes.getDouble("hi"); |
| |
| windowEvaluationHandler = |
| new SlidingSizeWindowEvaluationHandler( |
| new SlidingSizeWindowConfiguration(TSDataType.DOUBLE, 5, 5), |
| window -> { |
| double avg = 0; |
| for (int i = 0; i < window.size(); ++i) { |
| avg += window.getDouble(i); |
| } |
| avg /= window.size(); |
| |
| if (avg < lo || hi < avg) { |
| localIoTDBHandler.onEvent(new LocalIoTDBEvent(window.getTime(0), avg)); |
| mqttHandler.onEvent( |
| new MQTTEvent("test", QoS.EXACTLY_ONCE, false, window.getTime(0), avg)); |
| } |
| }); |
| } |
| |
| @Override |
| public void onDrop() throws Exception { |
| LOGGER.info("onDrop()"); |
| closeSinkHandlers(); |
| } |
| |
| @Override |
| public void onStart() throws Exception { |
| LOGGER.info("onStart()"); |
| openSinkHandlers(); |
| } |
| |
| @Override |
| public void onStop() throws Exception { |
| LOGGER.info("onStop()"); |
| closeSinkHandlers(); |
| } |
| |
| @Override |
| public Double fire(long timestamp, Double value, PartialPath path) throws Exception { |
| tryOpenSinksFirstOnFire(); |
| windowEvaluationHandler.collect(timestamp, value); |
| return value; |
| } |
| |
| @Override |
| public double[] fire(long[] timestamps, double[] values, PartialPath path) throws Exception { |
| tryOpenSinksFirstOnFire(); |
| for (int i = 0; i < timestamps.length; ++i) { |
| windowEvaluationHandler.collect(timestamps[i], values[i]); |
| } |
| return values; |
| } |
| |
| // See IOTDB-2274 for more detail. |
| private void tryOpenSinksFirstOnFire() throws Exception { |
| if (!isSinksOpenedAfterCreation) { |
| synchronized (this) { |
| if (!isSinksOpenedAfterCreation) { |
| openSinkHandlers(); |
| isSinksOpenedAfterCreation = true; |
| } |
| } |
| } |
| } |
| |
| private void openSinkHandlers() throws Exception { |
| localIoTDBHandler.open( |
| new LocalIoTDBConfiguration( |
| TARGET_DEVICE, new String[] {"local"}, new TSDataType[] {TSDataType.DOUBLE})); |
| mqttHandler.open( |
| new MQTTConfiguration( |
| "127.0.0.1", |
| 1883, |
| "root", |
| "root", |
| new PartialPath(TARGET_DEVICE), |
| new String[] {"remote"})); |
| } |
| |
| private void closeSinkHandlers() throws Exception { |
| localIoTDBHandler.close(); |
| mqttHandler.close(); |
| } |
| } |