Examples
========

The example programs in the ``examples/`` subdirectory are not built by default.
To enable them, use the ``--with-examples`` configure option:

.. code-block:: bash

   ./waf configure --with-examples
   ./waf

Once built, the example binaries can be found under ``build/examples/``:

* Full sync: ``psync-full-sync``
* Partial sync: ``psync-producer`` and ``psync-consumer``

If the library is installed to the system using ``./waf install``, then the examples
will also be installed and can be executed directly.

Partial Sync Example
--------------------

The partial sync example of PSync has two parts: producer and consumer.
These can be run on a machine after starting NFD.

Producer
^^^^^^^^

* Enable logging for the producer.

  .. code-block:: bash

     export NDN_LOG="examples.PartialSyncProducerApp=INFO"

* Start the producer that will listen on ``/sync`` and publish one update for each
  of ``/a-0`` ... ``/a-9``.

  .. code-block:: bash

     psync-producer /sync /a 10 1

* Sample output::

    1546280442.096296 INFO: [examples.PartialSyncProducerApp] Publish: /a-1/1
    1546280456.053138 INFO: [examples.PartialSyncProducerApp] Publish: /a-6/1
    1546280458.210415 INFO: [examples.PartialSyncProducerApp] Publish: /a-8/1
    1546280469.954134 INFO: [examples.PartialSyncProducerApp] Publish: /a-5/1
    1546280472.487425 INFO: [examples.PartialSyncProducerApp] Publish: /a-2/1
    1546280473.466515 INFO: [examples.PartialSyncProducerApp] Publish: /a-7/1
    1546280481.882258 INFO: [examples.PartialSyncProducerApp] Publish: /a-0/1
    1546280484.201229 INFO: [examples.PartialSyncProducerApp] Publish: /a-4/1
    1546280489.348968 INFO: [examples.PartialSyncProducerApp] Publish: /a-9/1
    1546280491.420391 INFO: [examples.PartialSyncProducerApp] Publish: /a-3/1

Consumer
^^^^^^^^

* In a new terminal, enable logging for the consumer.

  .. code-block:: bash

     export NDN_LOG="examples.PartialSyncConsumerApp=INFO"

* Run the consumer to subscribe to 5 random prefixes from the publisher on ``/sync``.

  .. code-block:: bash

     psync-consumer /sync 5

* Sample output from the consumer shows that it received updates only
  for the subscribed prefixes::

    1546280436.502769 INFO: [examples.PartialSyncConsumerApp] Subscribing to: /a-7
    1546280436.502888 INFO: [examples.PartialSyncConsumerApp] Subscribing to: /a-9
    1546280436.502911 INFO: [examples.PartialSyncConsumerApp] Subscribing to: /a-8
    1546280436.502934 INFO: [examples.PartialSyncConsumerApp] Subscribing to: /a-4
    1546280436.502956 INFO: [examples.PartialSyncConsumerApp] Subscribing to: /a-5
    1546280458.211188 INFO: [examples.PartialSyncConsumerApp] Update: /a-8/1
    1546280469.954886 INFO: [examples.PartialSyncConsumerApp] Update: /a-5/1
    1546280473.467116 INFO: [examples.PartialSyncConsumerApp] Update: /a-7/1
    1546280484.256181 INFO: [examples.PartialSyncConsumerApp] Update: /a-4/1
    1546280489.349793 INFO: [examples.PartialSyncConsumerApp] Update: /a-9/1

Full Sync Example
-----------------

To demonstrate the full sync mode of PSync, ``psync-full-sync`` can be run on a
machine after starting NFD.

* Enable logging for the full sync demo app.

  .. code-block:: bash

     export NDN_LOG="examples.FullSyncApp=INFO"

* Run the full sync example with sync prefix ``/sync``, user prefix ``/a``,
  and publish three updates for each user prefix: ``/a-0`` and ``/a-1``.
  This will simulate node *a*.

  .. code-block:: bash

     psync-full-sync /sync /a 2 3

* Repeat for another user prefix, to simulate node *b*.

  .. code-block:: bash

     psync-full-sync /sync /b 2 3

  We should see that node *a* and node *b* have received each other's updates.

* Sample output from node *a* shows that it received all updates from node *b*
  successfully::

    1546282730.759387 INFO: [examples.FullSyncApp] Update /b-1/1
    1546282741.143225 INFO: [examples.FullSyncApp] Publish: /a-1/1
    1546282749.375854 INFO: [examples.FullSyncApp] Publish: /a-0/1
    1546282750.263246 INFO: [examples.FullSyncApp] Update /b-0/1
    1546282765.875118 INFO: [examples.FullSyncApp] Update /b-1/2
    1546282783.777807 INFO: [examples.FullSyncApp] Publish: /a-0/2
    1546282794.565507 INFO: [examples.FullSyncApp] Publish: /a-0/3
    1546282794.896895 INFO: [examples.FullSyncApp] Publish: /a-1/2
    1546282803.839416 INFO: [examples.FullSyncApp] Update /b-0/2
    1546282804.785867 INFO: [examples.FullSyncApp] Update /b-1/3
    1546282845.273772 INFO: [examples.FullSyncApp] Publish: /a-1/3
    1546282855.102790 INFO: [examples.FullSyncApp] Update /b-0/3

* Sample output from node *b*::

    1546282730.758296 INFO: [examples.FullSyncApp] Publish: /b-1/1
    1546282741.144027 INFO: [examples.FullSyncApp] Update /a-1/1
    1546282749.376543 INFO: [examples.FullSyncApp] Update /a-0/1
    1546282750.262244 INFO: [examples.FullSyncApp] Publish: /b-0/1
    1546282765.296005 INFO: [examples.FullSyncApp] Publish: /b-1/2
    1546282783.778769 INFO: [examples.FullSyncApp] Update /a-0/2
    1546282794.566485 INFO: [examples.FullSyncApp] Update /a-0/3
    1546282795.374339 INFO: [examples.FullSyncApp] Update /a-1/2
    1546282803.838394 INFO: [examples.FullSyncApp] Publish: /b-0/2
    1546282804.033214 INFO: [examples.FullSyncApp] Publish: /b-1/3
    1546282845.274680 INFO: [examples.FullSyncApp] Update /a-1/3
    1546282855.101780 INFO: [examples.FullSyncApp] Publish: /b-0/3