ke han | 81a38b9 | 2017-03-10 18:41:44 +0800 | [diff] [blame^] | 1 | package org.opencord.igmpproxy; |
| 2 | |
| 3 | import com.google.common.collect.Maps; |
| 4 | import org.onlab.packet.Ip4Address; |
| 5 | import org.onosproject.net.DeviceId; |
| 6 | import java.util.Map; |
| 7 | import java.util.Set; |
| 8 | |
| 9 | /** |
| 10 | * State machine for whole IGMP process. The state machine is implemented on |
| 11 | * RFC 2236 "6. Host State Diagram". |
| 12 | */ |
| 13 | public final class StateMachine { |
| 14 | private StateMachine() { |
| 15 | |
| 16 | } |
| 17 | private static Map<String, SingleStateMachine> map = Maps.newConcurrentMap(); |
| 18 | |
| 19 | private static String getId(DeviceId devId, Ip4Address groupIp) { |
| 20 | return devId.toString() + "Group" + groupIp.toString(); |
| 21 | } |
| 22 | |
| 23 | private static SingleStateMachine get(DeviceId devId, Ip4Address groupIp) { |
| 24 | String id = getId(devId, groupIp); |
| 25 | return map.get(id); |
| 26 | } |
| 27 | |
| 28 | public static void destorySingle(DeviceId devId, Ip4Address groupIp) { |
| 29 | SingleStateMachine machine = get(devId, groupIp); |
| 30 | if (null == machine) { |
| 31 | return; |
| 32 | } |
| 33 | machine.cancelTimer(); |
| 34 | map.remove(getId(devId, groupIp)); |
| 35 | } |
| 36 | |
| 37 | public static boolean join(DeviceId devId, Ip4Address groupIp, Ip4Address srcIP) { |
| 38 | SingleStateMachine machine = get(devId, groupIp); |
| 39 | if (null == machine) { |
| 40 | machine = new SingleStateMachine(devId, groupIp, srcIP); |
| 41 | map.put(getId(devId, groupIp), machine); |
| 42 | machine.join(); |
| 43 | return true; |
| 44 | } |
| 45 | machine.increaseCounter(); |
| 46 | return false; |
| 47 | } |
| 48 | |
| 49 | public static boolean leave(DeviceId devId, Ip4Address groupIp) { |
| 50 | SingleStateMachine machine = get(devId, groupIp); |
| 51 | if (null == machine) { |
| 52 | return false; |
| 53 | } |
| 54 | machine.decreaseCounter(); |
| 55 | |
| 56 | if (machine.getCounter() == 0) { |
| 57 | machine.leave(); |
| 58 | destorySingle(devId, groupIp); |
| 59 | return true; |
| 60 | } |
| 61 | return false; |
| 62 | } |
| 63 | |
| 64 | static void specialQuery(DeviceId devId, Ip4Address groupIp, int maxResp) { |
| 65 | SingleStateMachine machine = get(devId, groupIp); |
| 66 | if (null == machine) { |
| 67 | return; |
| 68 | } |
| 69 | machine.query(maxResp); |
| 70 | } |
| 71 | |
| 72 | static void generalQuery(DeviceId devId, int maxResp) { |
| 73 | for (Map.Entry<String, SingleStateMachine> entry : map.entrySet()) { |
| 74 | SingleStateMachine machine = entry.getValue(); |
| 75 | if (devId.equals(machine.getDeviceId())) { |
| 76 | machine.query(maxResp); |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | public static Set<Map.Entry<String, SingleStateMachine>> entrySet() { |
| 82 | return map.entrySet(); |
| 83 | } |
| 84 | |
| 85 | public static void timeOut(DeviceId devId, Ip4Address groupIp) { |
| 86 | SingleStateMachine machine = get(devId, groupIp); |
| 87 | if (null == machine) { |
| 88 | return; |
| 89 | } |
| 90 | machine.timeOut(); |
| 91 | } |
| 92 | |
| 93 | public static void clearMap() { |
| 94 | map.clear(); |
| 95 | } |
| 96 | |
| 97 | } |