7.1. PojoCache API, POJO manipulation, and Replication

For this tutorial, start two instance of the demo GUI. In this tutorial, we will:

Attach POJOs to the cache and see them being replicated.
After attaching, manipulate the POJOs and see the individual changes replicated.
Retrieve POJOs from the cache, manipulate them and see the changes replicated.
Create POJOs that share a common POJO and the consequences of changes to this.
Detach POJOs from the cache.
After detaching, manipulates the POJOs and see how the values in the cache are unchanged.

In the 1st GUI instance, create a POJO, i.e. a Person with an Address:

   joe = new Person();
   joe.setName("Joe Black");
   joe.setAge(31);

   addr = new Address();
   addr.setCity("Sunnyvale");
   addr.setStreet("123 Albert Ave");
   addr.setZip(94086);

   joe.setAddress(addr);

Attach the POJO to the cache:

   cache.attach("pojo/joe", joe);

Change attributes of the POJO and see the individual changes being propagated to the 2nd cache GUI:
```
   joe.setAge(41);
                 
```

In the 2nd GUI instance, get a reference to the Person in the cache and create a second Person with the existing Person's Address:

   joe = cache.find("pojo/joe");

   mary = new Person();
   mary.setName("Mary White");
   mary.setAge(30);

   mary.setAddress(joe.getAddress());

Attach the new POJO to the cache:

   cache.attach("pojo/mary", mary);

Now, change either Person's Address and see how the change applies to both POJOs and has been propagated to the other cache, visible in the 1st GUI instance:
```
   mary.getAddress().setZip(95000);
                 
```
Still in the 2nd GUI instance, detach the POJOs from the cache and see how the POJOs are no longer visible:
```
   cache.detach("pojo/joe");
   cache.detach("pojo/mary");
                 
```
Finally, in any of GUI instances, change some attributes of the POJO and see these changes have no effect in the cache:
```
   joe.setName("Joe White");
                 
```