本文详细介绍了在 Floodlight 开发中所使用的 OpenFlow 消息类型及其用途。通过 OFMessage 接口及其实现的子接口，如 OFFlowAdd 和 OFFlowMod 等，可以针对不同类型的 OpenFlow 消息执行特定的操作。
OpenFlowJ-Loxigen - OFMessage
2017-3-2
在开发Floodlight模块时需要监听Openflow消息，这样的话不可避免会用到OFMessage。Eclipse没有直接给出说明（类型什么的没有），所以得去官网的Java Doc查看一下。还是老样子，这篇博文也是个流水账哦。
不管三七二十一，先把原味doc的链接po出来=_=。
这里我只需要知道Openflow消息的类型（很多场合下都需要，根据Openflow消息的类型执行相应的操作，巴拉巴拉），因此只需要了解getType方法就行。这里getType方法返回的是OFType类型，这是一个枚举量。该类的其他方法如下所示：
| 方法名称 | 返回值 | 参数 | 说明 |
|---|---|---|---|
| getVersion | OFVersion | None | 返回OpenFlow的版本信息 |
| getType | OFType | None | 返回OpenFlow消息的类型 |
| getXid | long | None | |
| writeTo | void | org.jboss.netty.buffer.ChannelBuffer channelBuffer | |
| createBuilder | OFMessage.Builder | None |
OFMessage是一个接口，在其基础上还实现了其它接口，我根据官方的java doc对其所有的子接口进行了一个汇总，这里有很多常用的子接口，例如OFFlowAdd，OFFlowMod，OFFlowRemoved等等，当我们在接收到来自交换机的packet的时候，我们就可根据packet的类型将收到的packet映射到对应的接口上：
| 接口名 | 子接口 | 介绍 |
|---|---|---|
| OFAggregateStatsReply | ||
| OFAggregateStatsRequest | ||
| OFAsyncConfigFailedErrorMsg | ||
| OFAsyncGetReply | ||
| OFAsyncGetRequest | ||
| OFAsyncSet | ||
| OFBadActionErrorMsg | ||
| OFBadInstructionErrorMsg | ||
| OFBadMatchErrorMsg | ||
| OFBadPropertyErrorMsg | ||
| OFBadRequestErrorMsg | ||
| OFBarrierReply | ||
| OFBarrierRequest | ||
| OFBsnArpIdle | ||
| OFBsnBwClearDataReply | ||
| OFBsnBwClearDataRequest | ||
| OFBsnBwEnableGetReply | ||
| OFBsnBwEnableGetRequest | ||
| OFBsnBwEnableSetReply | ||
| OFBsnBwEnableSetRequest | ||
| OFBsnControllerConnectionsReply | ||
| OFBsnControllerConnectionsRequest | ||
| OFBsnDebugCounterDescStatsReply | ||
| OFBsnDebugCounterDescStatsRequest | ||
| OFBsnDebugCounterStatsReply | ||
| OFBsnDebugCounterStatsRequest | ||
| OFBsnFlowChecksumBucketStatsReply | ||
| OFBsnFlowChecksumBucketStatsRequest | ||
| OFBsnFlowIdle | ||
| OFBsnFlowIdleEnableGetReply | ||
| OFBsnFlowIdleEnableGetRequest | ||
| OFBsnFlowIdleEnableSetReply | ||
| OFBsnFlowIdleEnableSetRequest | ||
| OFBsnGenericStatsReply | ||
| OFBsnGenericStatsRequest | ||
| OFBsnGentableBucketStatsReply | ||
| OFBsnGentableBucketStatsRequest | ||
| OFBsnGentableClearReply | ||
| OFBsnGentableClearRequest | ||
| OFBsnGentableDescStatsReply | ||
| OFBsnGentableDescStatsRequest | ||
| OFBsnGentableEntryAdd | ||
| OFBsnGentableEntryDelete | ||
| OFBsnGentableEntryDescStatsReply | ||
| OFBsnGentableEntryDescStatsRequest | ||
| OFBsnGentableEntryStatsReply | ||
| OFBsnGentableEntryStatsRequest | ||
| OFBsnGentableSetBucketsSize | ||
| OFBsnGentableStatsReply | ||
| OFBsnGentableStatsRequest | ||
| OFBsnGetInterfacesReply | ||
| OFBsnGetInterfacesRequest | ||
| OFBsnGetIpMaskReply | ||
| OFBsnGetIpMaskRequest | ||
| OFBsnGetL2TableReply | ||
| OFBsnGetL2TableRequest | ||
| OFBsnGetMirroringReply | ||
| OFBsnGetMirroringRequest | ||
| OFBsnGetSwitchPipelineReply | ||
| OFBsnGetSwitchPipelineRequest | ||
| OFBsnHeader | ||
| OFBsnHybridGetReply | ||
| OFBsnHybridGetRequest | ||
| OFBsnImageDescStatsReply | ||
| OFBsnImageDescStatsRequest | ||
| OFBsnLacpConvergenceNotif | ||
| OFBsnLacpStatsReply | ||
| OFBsnLacpStatsRequest | ||
| OFBsnLog | ||
| OFBsnLuaCommandReply | ||
| OFBsnLuaCommandRequest | ||
| OFBsnLuaNotification | ||
| OFBsnLuaUpload | ||
| OFBsnPduRxReply | ||
| OFBsnPduRxRequest | ||
| OFBsnPduRxTimeout | ||
| OFBsnPduTxReply | ||
| OFBsnPduTxRequest | ||
| OFBsnPortCounterStatsReply | ||
| OFBsnPortCounterStatsRequest | ||
| OFBsnRoleStatus | ||
| OFBsnSetAuxCxnsReply | ||
| OFBsnSetAuxCxnsRequest | ||
| OFBsnSetIpMask | ||
| OFBsnSetL2TableReply | ||
| OFBsnSetL2TableRequest | ||
| OFBsnSetLacpReply | ||
| OFBsnSetLacpRequest | ||
| OFBsnSetMirroring | ||
| OFBsnSetPktinSuppressionReply | ||
| OFBsnSetPktinSuppressionRequest | ||
| OFBsnSetSwitchPipelineReply | ||
| OFBsnSetSwitchPipelineRequest | ||
| OFBsnShellCommand | ||
| OFBsnShellOutput | ||
| OFBsnShellStatus | ||
| OFBsnStatsReply | ||
| OFBsnStatsRequest | ||
| OFBsnSwitchPipelineStatsReply | ||
| OFBsnSwitchPipelineStatsRequest | ||
| OFBsnTableChecksumStatsReply | ||
| OFBsnTableChecksumStatsRequest | ||
| OFBsnTableSetBucketsSize | ||
| OFBsnTimeReply | ||
| OFBsnTimeRequest | ||
| OFBsnVirtualPortCreateReply | ||
| OFBsnVirtualPortCreateRequest | ||
| OFBsnVirtualPortRemoveReply | ||
| OFBsnVirtualPortRemoveRequest | ||
| OFBsnVlanCounterStatsReply | ||
| OFBsnVlanCounterStatsRequest | ||
| OFBsnVrfCounterStatsReply | ||
| OFBsnVrfCounterStatsRequest | ||
| OFBundleAddMsg | ||
| OFBundleCtrlMsg | ||
| OFBundleFailedErrorMsg | ||
| OFDescStatsReply | ||
| OFDescStatsRequest | ||
| OFEchoReply | ||
| OFEchoRequest | ||
| OFErrorMsg | ||
| OFExperimenter | ||
| OFExperimenterErrorMsg | ||
| OFExperimenterStatsReply | ||
| OFExperimenterStatsRequest | ||
| OFFeaturesReply | ||
| OFFeaturesRequest | ||
| OFFlowAdd | ||
| OFFlowDelete | ||
| OFFlowDeleteStrict | ||
| OFFlowMod | ||
| OFFlowModFailedErrorMsg | ||
| OFFlowModify | ||
| OFFlowModifyStrict | ||
| OFFlowMonitorFailedErrorMsg | ||
| OFFlowRemoved | ||
| OFFlowStatsReply | ||
| OFFlowStatsRequest | ||
| OFGetConfigReply | ||
| OFGetConfigRequest | ||
| OFGroupAdd | ||
| OFGroupDelete | ||
| OFGroupDescStatsReply | ||
| OFGroupDescStatsRequest | ||
| OFGroupFeaturesStatsReply | ||
| OFGroupFeaturesStatsRequest | ||
| OFGroupMod | ||
| OFGroupModFailedErrorMsg | ||
| OFGroupModify | ||
| OFGroupStatsReply | ||
| OFGroupStatsRequest | ||
| OFHello | ||
| OFHelloFailedErrorMsg | ||
| OFMeterConfigStatsReply | ||
| OFMeterConfigStatsRequest | ||
| OFMeterFeaturesStatsReply | ||
| OFMeterFeaturesStatsRequest | ||
| OFMeterMod | ||
| OFMeterModFailedErrorMsg | ||
| OFMeterStatsReply | ||
| OFMeterStatsRequest | ||
| OFNiciraControllerRoleReply | ||
| OFNiciraControllerRoleRequest | ||
| OFNiciraHeader | ||
| OFPacketIn | ||
| OFPacketOut | ||
| OFPortDescStatsReply | ||
| OFPortDescStatsRequest | ||
| OFPortMod | ||
| OFPortModFailedErrorMsg | ||
| OFPortStatsReply | ||
| OFPortStatsRequest | ||
| OFPortStatus | ||
| OFQueueDescStatsReply | ||
| OFQueueDescStatsRequest | ||
| OFQueueGetConfigReply | ||
| OFQueueGetConfigRequest | ||
| OFQueueOpFailedErrorMsg | ||
| OFQueueStatsReply | ||
| OFQueueStatsRequest | ||
| OFRequest | ||
| OFRequestforward | ||
| OFRoleReply | ||
| OFRoleRequest | ||
| OFRoleRequestFailedErrorMsg | ||
| OFRoleStatus | ||
| OFSetConfig | ||
| OFStatsReply | ||
| OFStatsRequest | ||
| OFSwitchConfigFailedErrorMsg | ||
| OFTableDescStatsReply | ||
| OFTableDescStatsRequest | ||
| OFTableFeaturesFailedErrorMsg | ||
| OFTableFeaturesStatsReply | ||
| OFTableFeaturesStatsRequest | ||
| OFTableMod | ||
| OFTableModFailedErrorMsg | ||
| OFTableStatsReply | ||
| OFTableStatsRequest | ||
| OFTableStatus |
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