| tom | cfde062 | 2014-09-09 11:02:42 -0700 | [diff] [blame] | 1 | <html> |
| 2 | <body> |
| tom | 5717f39 | 2014-09-13 15:50:43 -0700 | [diff] [blame] | 3 | <p> |
| 4 | ONOS architecture is strictly segmented into a <em>protocol-agnostic system |
| 5 | core</em> tier and the <em>protocol-aware providers</em> tier as shown in |
| 6 | the figure below:<br> |
| 7 | <img src="doc-files/onos-tiers.png" alt="ONOS architecture tiers"> |
| 8 | </p> |
| tom | cfde062 | 2014-09-09 11:02:42 -0700 | [diff] [blame] | 9 | |
| tom | 5717f39 | 2014-09-13 15:50:43 -0700 | [diff] [blame] | 10 | <p> |
| 11 | The <em>ONOS core</em> is responsible for tracking information about the |
| 12 | network environment and distributing it to the applications either |
| 13 | synchronously via query or asynchronously via listener callbacks. The |
| 14 | core is also responsible for persisting select state and synchronizing state |
| 15 | among the cluster peers. |
| 16 | </p> |
| tom | cfde062 | 2014-09-09 11:02:42 -0700 | [diff] [blame] | 17 | |
| tom | 5717f39 | 2014-09-13 15:50:43 -0700 | [diff] [blame] | 18 | <p> |
| 19 | The <em>protocol-aware providers</em> are responsible for interacting with |
| 20 | the network environment using various control and configuration protocols |
| 21 | and supplying such sensory data to the core. Some providers may also need to |
| 22 | accept control edicts from the core and apply them to the environment |
| 23 | using the appropriate protocol-specific means. |
| 24 | </p> |
| 25 | |
| 26 | <p> |
| 27 | The following diagram describes a general structure of each ONOS subsystem: |
| 28 | <br> |
| 29 | <img src="doc-files/onos-subsystem.png" alt="ONOS subsystem structure"><br> |
| 30 | For example, the device-subsystem comprises of a core |
| 31 | {@link org.onlab.onos.net.trivial.device.impl.SimpleDeviceManager DeviceManager}, |
| 32 | which exposes a north-bound |
| 33 | {@link org.onlab.onos.net.device.DeviceService} through which applications or other core components |
| 34 | can learn about the global infrastructure device inventory and through |
| 35 | which they can also subscribe for asynchronous {@link org.onlab.onos.net.device.DeviceEvent} |
| 36 | notifications via the {@link org.onlab.onos.net.device.DeviceListener} mechanism. A set of |
| 37 | administrative actions can be performed via {@link org.onlab.onos.net.device.DeviceAdminService}, |
| 38 | e.g. setting mastership role, removing a decommissioned device. |
| 39 | </p> |
| 40 | |
| 41 | <p> |
| 42 | On the south-bound side, the core {@link org.onlab.onos.net.trivial.device.impl.SimpleDeviceManager DeviceManager} |
| 43 | exposes a {@link org.onlab.onos.net.device.DeviceProviderRegistry} through which any number of |
| 44 | {@link org.onlab.onos.net.device.DeviceProvider} entities can register and in turn obtain a |
| 45 | {@link org.onlab.onos.net.device.DeviceProviderService}. Device and port information can then be |
| 46 | supplied to the core by each provider through the provider service issued |
| 47 | to them. When a provider unregisters, its {@link org.onlab.onos.net.device.DeviceProviderService} |
| 48 | will be invalidated and can no longer be used for interacting with the |
| 49 | core. |
| 50 | </p> |
| 51 | |
| 52 | <p> |
| 53 | Within the core, the tasks of indexing, persisting and synchronizing the |
| 54 | global device and port state with the cluster peers falls on the |
| 55 | {@link org.onlab.onos.net.trivial.device.impl.SimpleDeviceStore DeviceStore}. |
| 56 | </p> |
| 57 | |
| 58 | <p> |
| 59 | Similar structure applies to the link subsystem, host subsystem and others. |
| 60 | </p> |
| 61 | |
| 62 | <p> |
| 63 | <em>More information to come later...</em> |
| 64 | </p> |
| 65 | |
| 66 | </body> |
| 67 | </html> |