10.2. Use the Default Cache

Procedure 10.2. Add and Remove Data from the Cache

1. Add an entry, replacing key and value with the desired key and value:

   cache.put("key", "value");

   Copy to Clipboard Toggle word wrap
2. Confirm that the entry is present in the cache:

   assertEquals(1, cache.size());
   assertTrue(cache.containsKey("key"));

   Copy to Clipboard Toggle word wrap
3. Remove the entry from the cache:

   Object v = cache.remove("key");

   Copy to Clipboard Toggle word wrap
4. Confirm that the entry is no longer present in the cache:

   assertEquals("value", v);
   assertTrue(cache.isEmpty());

   Copy to Clipboard Toggle word wrap

Procedure 10.3. Adding and Replacing a Key Value

• Add an entry key with value as the key's value.

  cache.put("key", "value");

  Copy to Clipboard Toggle word wrap

Procedure 10.4. Replacing a Key Value

1. The following code searches for keys (named key and key2). If the two specific keys beings searched for are not found, JBoss Data Grid creates two new keys with the specified key names and values.

   cache.putIfAbsent("key", "newValue");
   cache.putIfAbsent("key2", "value2");

   Copy to Clipboard Toggle word wrap
2. The following code confirms that the value of the stored key equals the value we wanted to store.

   assertEquals(cache.get("key"), "value");
   assertEquals(cache.get("key2"), "value2");

   Copy to Clipboard Toggle word wrap

Procedure 10.5. Adjust the Data Life

1. Alter the key's lifespan value:

   cache.put("key", "value", 5, TimeUnit.SECONDS);

   Copy to Clipboard Toggle word wrap
2. Check if the cache contains the key:

   assertTrue(cache.containsKey("key"));

   Copy to Clipboard Toggle word wrap
3. After the allocated lifespan time has expired, the key is no longer in the cache:

   Thread.sleep(10000);
   assertFalse(cache.containsKey("key"));

   Copy to Clipboard Toggle word wrap