Srikanth Vavilapalli | 95810f5 | 2015-09-14 15:49:56 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.provider.of.flow.impl; |
| 17 | |
| 18 | import org.onlab.util.SharedExecutors; |
| 19 | import org.onosproject.openflow.controller.OpenFlowSwitch; |
| 20 | import org.onosproject.openflow.controller.RoleState; |
| 21 | import org.projectfloodlight.openflow.protocol.OFTableStatsRequest; |
| 22 | import org.slf4j.Logger; |
| 23 | |
| 24 | import java.util.Timer; |
| 25 | import java.util.TimerTask; |
| 26 | |
| 27 | import static org.slf4j.LoggerFactory.getLogger; |
| 28 | |
| 29 | /** |
| 30 | * Collects Table statistics for the specified switch. |
| 31 | */ |
| 32 | class TableStatisticsCollector { |
| 33 | |
| 34 | private final Logger log = getLogger(getClass()); |
| 35 | |
| 36 | public static final int SECONDS = 1000; |
| 37 | |
| 38 | private final OpenFlowSwitch sw; |
| 39 | private Timer timer; |
| 40 | private TimerTask task; |
| 41 | |
| 42 | private int pollInterval; |
| 43 | |
| 44 | /** |
| 45 | * Creates a new table statistics collector for the given switch and poll frequency. |
| 46 | * |
| 47 | * @param timer timer to use for scheduling |
| 48 | * @param sw switch to pull |
| 49 | * @param pollInterval poll frequency in seconds |
| 50 | */ |
| 51 | TableStatisticsCollector(Timer timer, OpenFlowSwitch sw, int pollInterval) { |
| 52 | this.timer = timer; |
| 53 | this.sw = sw; |
| 54 | this.pollInterval = pollInterval; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Adjusts poll frequency. |
| 59 | * |
| 60 | * @param pollInterval poll frequency in seconds |
| 61 | */ |
| 62 | synchronized void adjustPollInterval(int pollInterval) { |
| 63 | this.pollInterval = pollInterval; |
| 64 | task.cancel(); |
| 65 | task = new InternalTimerTask(); |
| 66 | timer.scheduleAtFixedRate(task, pollInterval * SECONDS, pollInterval * 1000); |
| 67 | } |
| 68 | |
| 69 | private class InternalTimerTask extends TimerTask { |
| 70 | @Override |
| 71 | public void run() { |
| 72 | if (sw.getRole() == RoleState.MASTER) { |
| 73 | log.trace("Collecting stats for {}", sw.getStringId()); |
| 74 | OFTableStatsRequest request = sw.factory().buildTableStatsRequest() |
| 75 | .build(); |
| 76 | sw.sendMsg(request); |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | public synchronized void start() { |
| 82 | // Initially start polling quickly. Then drop down to configured value |
| 83 | log.debug("Starting Table Stats collection thread for {}", sw.getStringId()); |
| 84 | task = new InternalTimerTask(); |
| 85 | SharedExecutors.getTimer().scheduleAtFixedRate(task, 1 * SECONDS, |
| 86 | pollInterval * SECONDS); |
| 87 | } |
| 88 | |
| 89 | public synchronized void stop() { |
| 90 | log.debug("Stopping Table Stats collection thread for {}", sw.getStringId()); |
| 91 | task.cancel(); |
| 92 | task = null; |
| 93 | } |
| 94 | |
| 95 | } |