JBoss.org Community Documentation
Next, let's use the
Cache
API to access
a
Node
in the cache and then do some
simple reads and writes to that node.
// Let's get ahold of the root node. Node rootNode = cache.getRoot(); // Remember, JBoss Cache stores data in a tree structure. // All nodes in the tree structure are identified by Fqn objects. Fqn peterGriffinFqn = Fqn.fromString("/griffin/peter"); // Create a new Node Node peterGriffin = rootNode.addChild(peterGriffinFqn); // let's store some data in the node peterGriffin.put("isCartoonCharacter", Boolean.TRUE); peterGriffin.put("favouriteDrink", new Beer()); // some tests (just assume this code is in a JUnit test case) assertTrue(peterGriffin.get("isCartoonCharacter")); assertEquals(peterGriffinFqn, peterGriffin.getFqn()); assertTrue(rootNode.hasChild(peterGriffinFqn)); Set keys = new HashSet(); keys.add("isCartoonCharacter"); keys.add("favouriteDrink"); assertEquals(keys, peterGriffin.getKeys()); // let's remove some data from the node peterGriffin.remove("favouriteDrink"); assertNull(peterGriffin.get("favouriteDrink"); // let's remove the node altogether rootNode.removeChild(peterGriffinFqn); assertFalse(rootNode.hasChild(peterGriffinFqn));
The
Cache
interface also exposes put/get/remove
operations that take an
Fqn
as an argument:
Fqn peterGriffinFqn = Fqn.fromString("/griffin/peter"); cache.put(peterGriffinFqn, "isCartoonCharacter", Boolean.TRUE); cache.put(peterGriffinFqn, "favouriteDrink", new Beer()); assertTrue(peterGriffin.get(peterGriffinFqn, "isCartoonCharacter")); assertTrue(cache.getRootNode().hasChild(peterGriffinFqn)); cache.remove(peterGriffinFqn, "favouriteDrink"); assertNull(cache.get(peterGriffinFqn, "favouriteDrink"); cache.removeNode(peterGriffinFqn); assertFalse(cache.getRootNode().hasChild(peterGriffinFqn));