PSync examples
==============

By default, examples in ``examples/`` folder are not built.  To enable them, use
``--with-examples`` configure option. For example:

.. code-block:: bash

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


Example binary 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
are also installed and can be executed directly.

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

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

Producer
^^^^^^^^

* Enable the logs for producer:

.. code-block:: bash

   export NDN_LOG=examples.PartialSyncProducerApp=INFO


* Start the producer that will listen on /sync and publish 1 update for /a-0 ... /a-9 each.

.. code-block:: bash

   psync-producer /sync /a 10 1


* Sample output:

.. code-block:: bash

   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 the logs for 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:

.. code-block:: bash

   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 full sync mode of PSync, ``psync-full-sync``
can be run on a machine after starting NFD:


* Enable the logs for full sync:

.. 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:

.. code-block:: bash

   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:

.. code-block:: bash

   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