tom | 8bf2e6b | 2014-09-10 20:53:54 -0700 | [diff] [blame] | 1 | package org.onlab.onos.net.trivial.topology.provider.impl; |
tom | cbff939 | 2014-09-10 00:45:23 -0700 | [diff] [blame] | 2 | |
| 3 | import org.apache.felix.scr.annotations.Activate; |
| 4 | import org.apache.felix.scr.annotations.Component; |
| 5 | import org.apache.felix.scr.annotations.Deactivate; |
| 6 | import org.apache.felix.scr.annotations.Reference; |
| 7 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 8 | import org.onlab.onos.event.AbstractEventAccumulator; |
| 9 | import org.onlab.onos.event.Event; |
| 10 | import org.onlab.onos.event.EventAccumulator; |
| 11 | import org.onlab.onos.net.device.DeviceEvent; |
| 12 | import org.onlab.onos.net.device.DeviceListener; |
| 13 | import org.onlab.onos.net.device.DeviceService; |
| 14 | import org.onlab.onos.net.link.LinkEvent; |
| 15 | import org.onlab.onos.net.link.LinkListener; |
| 16 | import org.onlab.onos.net.link.LinkService; |
| 17 | import org.onlab.onos.net.provider.AbstractProvider; |
| 18 | import org.onlab.onos.net.provider.ProviderId; |
| 19 | import org.onlab.onos.net.topology.TopologyDescription; |
| 20 | import org.onlab.onos.net.topology.TopologyProvider; |
| 21 | import org.onlab.onos.net.topology.TopologyProviderRegistry; |
| 22 | import org.onlab.onos.net.topology.TopologyProviderService; |
| 23 | import org.slf4j.Logger; |
| 24 | |
| 25 | import java.util.List; |
| 26 | import java.util.Timer; |
| 27 | import java.util.concurrent.ExecutorService; |
| 28 | |
| 29 | import static java.util.concurrent.Executors.newFixedThreadPool; |
| 30 | import static org.onlab.onos.net.device.DeviceEvent.Type.*; |
| 31 | import static org.onlab.util.Tools.namedThreads; |
| 32 | import static org.slf4j.LoggerFactory.getLogger; |
| 33 | |
| 34 | /** |
| 35 | * Simple implementation of a network topology provider/computor. |
| 36 | */ |
| 37 | @Component(immediate = true) |
| 38 | public class SimpleTopologyProvider extends AbstractProvider |
| 39 | implements TopologyProvider { |
| 40 | |
| 41 | // TODO: make these configurable |
| 42 | private static final int MAX_EVENTS = 100; |
| 43 | private static final int MAX_IDLE_MS = 50; |
| 44 | private static final int MAX_BATCH_MS = 200; |
| 45 | private static final int MAX_THREADS = 8; |
| 46 | |
| 47 | // FIXME: Replace with a system-wide timer instance |
| 48 | private static final Timer TIMER = new Timer(); |
| 49 | |
| 50 | private final Logger log = getLogger(getClass()); |
| 51 | |
| 52 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 53 | protected TopologyProviderRegistry providerRegistry; |
| 54 | |
| 55 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 56 | protected DeviceService deviceService; |
| 57 | |
| 58 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 59 | protected LinkService linkService; |
| 60 | |
| 61 | private volatile boolean isStarted = false; |
| 62 | |
| 63 | private TopologyProviderService providerService; |
| 64 | private DeviceListener deviceListener = new InnerDeviceListener(); |
| 65 | private LinkListener linkListener = new InnerLinkListener(); |
| 66 | |
| 67 | private EventAccumulator accumulator; |
| 68 | private ExecutorService executor; |
| 69 | |
| 70 | /** |
| 71 | * Creates a provider with the supplier identifier. |
| 72 | */ |
| 73 | public SimpleTopologyProvider() { |
| 74 | super(new ProviderId("org.onlab.onos.provider.topology")); |
| 75 | } |
| 76 | |
| 77 | @Activate |
| 78 | public synchronized void activate() { |
| 79 | executor = newFixedThreadPool(MAX_THREADS, namedThreads("topo-compute-%d")); |
| 80 | accumulator = new TopologyChangeAccumulator(); |
| 81 | |
| 82 | providerService = providerRegistry.register(this); |
| 83 | deviceService.addListener(deviceListener); |
| 84 | linkService.addListener(linkListener); |
| 85 | |
| 86 | isStarted = true; |
| 87 | triggerTopologyBuild(null); |
| 88 | log.info("Started"); |
| 89 | } |
| 90 | |
| 91 | @Deactivate |
| 92 | public synchronized void deactivate() { |
| 93 | deviceService.removeListener(deviceListener); |
| 94 | linkService.removeListener(linkListener); |
| 95 | providerRegistry.unregister(this); |
| 96 | providerService = null; |
| 97 | |
| 98 | executor.shutdownNow(); |
| 99 | executor = null; |
| 100 | |
| 101 | isStarted = false; |
| 102 | log.info("Stopped"); |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Triggers assembly of topology data citing the specified events as the |
| 107 | * reason. |
| 108 | * |
| 109 | * @param reasons events which triggered the topology change |
| 110 | */ |
| 111 | private void triggerTopologyBuild(List<Event> reasons) { |
| 112 | executor.execute(new TopologyBuilderTask(reasons)); |
| 113 | } |
| 114 | |
| 115 | // Builds the topology using the latest device and link information |
| 116 | // and citing the specified events as reasons for the change. |
| 117 | private void buildTopology(List<Event> reasons) { |
tom | cbff939 | 2014-09-10 00:45:23 -0700 | [diff] [blame] | 118 | if (isStarted) { |
| 119 | TopologyDescription desc = |
| 120 | new DefaultTopologyDescription(System.nanoTime(), |
| 121 | deviceService.getDevices(), |
| 122 | linkService.getLinks()); |
| 123 | providerService.topologyChanged(desc, reasons); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | // Callback for device events |
| 128 | private class InnerDeviceListener implements DeviceListener { |
| 129 | @Override |
| 130 | public void event(DeviceEvent event) { |
| 131 | DeviceEvent.Type type = event.type(); |
| 132 | if (type == DEVICE_ADDED || type == DEVICE_REMOVED || |
| 133 | type == DEVICE_AVAILABILITY_CHANGED) { |
| 134 | accumulator.add(event); |
| 135 | } |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | // Callback for link events |
| 140 | private class InnerLinkListener implements LinkListener { |
| 141 | @Override |
| 142 | public void event(LinkEvent event) { |
| 143 | accumulator.add(event); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | // Event accumulator for paced triggering of topology assembly. |
| 148 | private class TopologyChangeAccumulator |
| 149 | extends AbstractEventAccumulator implements EventAccumulator { |
| 150 | |
| 151 | TopologyChangeAccumulator() { |
| 152 | super(TIMER, MAX_EVENTS, MAX_BATCH_MS, MAX_IDLE_MS); |
| 153 | } |
| 154 | |
| 155 | @Override |
| 156 | public void processEvents(List<Event> events) { |
| 157 | triggerTopologyBuild(events); |
| 158 | } |
| 159 | |
| 160 | } |
| 161 | |
| 162 | // Task for building topology data in a separate thread. |
| 163 | private class TopologyBuilderTask implements Runnable { |
| 164 | private final List<Event> reasons; |
| 165 | |
| 166 | public TopologyBuilderTask(List<Event> reasons) { |
| 167 | this.reasons = reasons; |
| 168 | } |
| 169 | |
| 170 | @Override |
| 171 | public void run() { |
| 172 | buildTopology(reasons); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | } |