| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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. |
| */ |
| package org.onosproject.provider.of.flow.impl; |
| |
| import org.onosproject.openflow.controller.OpenFlowSwitch; |
| import org.onosproject.openflow.controller.RoleState; |
| import org.projectfloodlight.openflow.protocol.OFTableStatsRequest; |
| import org.slf4j.Logger; |
| |
| import java.util.TimerTask; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.TimeUnit; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * Collects Table statistics for the specified switch. |
| */ |
| class TableStatisticsCollector implements SwitchDataCollector { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| public static final long MS = 1000; |
| |
| private final OpenFlowSwitch sw; |
| private ScheduledExecutorService executorService; |
| private TimerTask task; |
| private ScheduledFuture<?> scheduledTask; |
| |
| private int pollInterval; |
| |
| /** |
| * Creates a new table statistics collector for the given switch and poll frequency. |
| * |
| * @param executorService executor used for scheduling |
| * @param sw switch to pull |
| * @param pollInterval poll frequency in seconds |
| */ |
| TableStatisticsCollector(ScheduledExecutorService executorService, OpenFlowSwitch sw, int pollInterval) { |
| this.executorService = executorService; |
| this.sw = sw; |
| this.pollInterval = pollInterval; |
| } |
| |
| /** |
| * Adjusts poll frequency. |
| * |
| * @param pollInterval poll frequency in seconds |
| */ |
| synchronized void adjustPollInterval(int pollInterval) { |
| this.pollInterval = pollInterval; |
| if (task != null) { |
| task.cancel(); |
| } |
| task = new InternalTimerTask(); |
| if (scheduledTask != null) { |
| scheduledTask.cancel(false); |
| } |
| scheduledTask = executorService.scheduleAtFixedRate(task, pollInterval * MS, |
| pollInterval * MS, TimeUnit.MILLISECONDS); |
| } |
| |
| private class InternalTimerTask extends TimerTask { |
| @Override |
| public void run() { |
| if (sw.getRole() == RoleState.MASTER) { |
| log.trace("Collecting stats for {}", sw.getStringId()); |
| OFTableStatsRequest request = sw.factory().buildTableStatsRequest() |
| .build(); |
| sw.sendMsg(request); |
| } |
| } |
| } |
| |
| public synchronized void start() { |
| log.debug("Starting Table Stats collection thread for {}", sw.getStringId()); |
| task = new InternalTimerTask(); |
| if (pollInterval > 0) { |
| // Initially start polling quickly. Then drop down to configured value |
| scheduledTask = executorService.scheduleAtFixedRate(task, 1 * MS, |
| pollInterval * MS, TimeUnit.MILLISECONDS); |
| } else { |
| // Trigger the poll only once |
| executorService.schedule(task, 0, TimeUnit.MILLISECONDS); |
| } |
| } |
| |
| public synchronized void stop() { |
| log.debug("Stopping Table Stats collection thread for {}", sw.getStringId()); |
| if (task != null) { |
| task.cancel(); |
| } |
| task = null; |
| if (scheduledTask != null) { |
| scheduledTask.cancel(false); |
| } |
| scheduledTask = null; |
| } |
| |
| } |