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Diffstat (limited to 'services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGenerator.java')
| -rw-r--r-- | services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGenerator.java | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGenerator.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGenerator.java new file mode 100644 index 000000000..62663b9f1 --- /dev/null +++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGenerator.java @@ -0,0 +1,176 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed 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. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.service.engine.event; + +import java.util.HashMap; +import java.util.Map; +import java.util.Timer; +import java.util.TimerTask; + +import org.onap.policy.apex.service.engine.runtime.EngineServiceEventInterface; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This class is used to generate periodic events into an Apex engine service. It is used to trigger + * policies that perform housekeeping operations. + * + * @author eeilfn + */ +public class ApexPeriodicEventGenerator extends TimerTask { + private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexPeriodicEventGenerator.class); + + /** The name of the periodic event. */ + public static final String PERIODIC_EVENT_NAME = "PERIODIC_EVENT"; + + /** The version of the periodic event. */ + public static final String PERIODIC_EVENT_VERSION = "0.0.1"; + + /** The name space of the periodic event. */ + public static final String PERIODIC_EVENT_NAMESPACE = "com.ericsson.apex.service.engine.event"; + + /** The source of the periodic event. */ + public static final String PERIODIC_EVENT_SOURCE = "internal"; + + /** The target of the periodic event. */ + public static final String PERIODIC_EVENT_TARGET = "internal"; + + /** + * The field name in the periodic event for the delay between occurrences of the periodic event. + */ + public static final String PERIODIC_DELAY = "PERIODIC_DELAY"; + + /** + * The field name in the periodic event for the time at which the first periodic event will + * occur. + */ + public static final String PERIODIC_FIRST_TIME = "PERIODIC_FIRST_TIME"; + + /** + * The field name in the periodic event for the time at which the last periodic event will + * occur. + */ + public static final String PERIODIC_LAST_TIME = "PERIODIC_LAST_TIME"; + + /** The field name in the periodic event for the time at which the event was sent. */ + public static final String PERIODIC_CURRENT_TIME = "PERIODIC_CURRENT_TIME"; + + /** + * The field name in the periodic event for the number of occurrences of this event that have + * been sent to date, this is a sequence number for the periodic event. + */ + public static final String PERIODIC_EVENT_COUNT = "PERIODIC_EVENT_COUNT"; + + // The Java timer used to send periodic events + private Timer timer = null; + + // The engine service interface we'll send periodic events to + private final EngineServiceEventInterface engineServiceEventInterface; + + // Timing information + private long period = 0; + private long firstEventTime = 0; + private long lastEventTime = 0; + private long eventCount = 0; + + /** + * Constructor, save a reference to the event stream handler. + * + * @param engineServiceEventInterface the engine service event interface on which to send + * periodic events + * @param period The period in milliseconds between events + */ + public ApexPeriodicEventGenerator(final EngineServiceEventInterface engineServiceEventInterface, + final long period) { + // Save the engine service reference and delay + this.engineServiceEventInterface = engineServiceEventInterface; + this.period = period; + + timer = new Timer(ApexPeriodicEventGenerator.class.getSimpleName(), true); + timer.schedule(this, period, period); + } + + /** + * Output the metrics for stream loading. + */ + @Override + public void run() { + final Map<String, Object> periodicEventMap = new HashMap<>(); + + // Record the current event time + final long currentEventTime = System.currentTimeMillis(); + + // Check if this is the first periodic event + if (firstEventTime == 0) { + firstEventTime = currentEventTime; + lastEventTime = currentEventTime; + } + + // Increment the event counter + eventCount++; + + // Set the fields in the periodic event + periodicEventMap.put(PERIODIC_DELAY, period); + periodicEventMap.put(PERIODIC_FIRST_TIME, firstEventTime); + periodicEventMap.put(PERIODIC_LAST_TIME, lastEventTime); + periodicEventMap.put(PERIODIC_CURRENT_TIME, currentEventTime); + periodicEventMap.put(PERIODIC_EVENT_COUNT, eventCount); + + // Send the periodic event + try { + final ApexEvent periodicEvent = new ApexEvent(PERIODIC_EVENT_NAME, PERIODIC_EVENT_VERSION, + PERIODIC_EVENT_NAMESPACE, PERIODIC_EVENT_SOURCE, PERIODIC_EVENT_TARGET); + periodicEvent.putAll(periodicEventMap); + engineServiceEventInterface.sendEvent(periodicEvent); + } catch (final ApexEventException e) { + LOGGER.warn("could not send Apex periodic event " + PERIODIC_EVENT_NAME + ":" + PERIODIC_EVENT_VERSION, e); + return; + } + + // Save the current time as the last time + lastEventTime = currentEventTime; + } + + /** + * Cancel the timer. + * + * @return true, if cancel + */ + @Override + public boolean cancel() { + // Cancel the timer + if (timer != null) { + timer.cancel(); + } + return true; + } + + /* + * (non-Javadoc) + * + * @see java.lang.Object#toString() + */ + @Override + public String toString() { + return "ApexPeriodicEventGenerator [period=" + period + ", firstEventTime=" + firstEventTime + + ", lastEventTime=" + lastEventTime + ", eventCount=" + eventCount + "]"; + } +} |