Examples of com.thinkaurelius.titan.diskstorage.locking.consistentkey.ExpectedValueCheckingStore

com.thinkaurelius.titan.diskstorage.locking.consistentkey.ExpectedValueCheckingStore

A {@link KeyColumnValueStore} wrapper intended for nontransactional storesthat forwards all but these two methods to an encapsulated store instance:

{@link #acquireLock(StaticBuffer,StaticBuffer,StaticBuffer,StoreTransaction)}
{@link #mutate(StaticBuffer,List,List,StoreTransaction)}

This wrapper adds some logic to both of the overridden methods before calling the encapsulated store's version.

This class, along with its collaborator class {@link ExpectedValueCheckingTransaction}, track all {@code expectedValue}arguments passed to {@code acquireLock} for each {@code StoreTransaction}. When the transaction first {@code mutate(...)}s, the these classes cooperate to check that all previously provided expected values match actual values, throwing an exception and preventing mutation if a mismatch is detected.

This relies on a {@code Locker} instance supplied during construction forlocking.

                    store[i] = new TransactionalLockStore(store[i]);
                } else if (storeFeatures.supportsConsistentKeyOperations()) {


                    KeyColumnValueStore lockerStore = manager[i].openDatabase(DB_NAME + "_lock_");
                    ConsistentKeyLocker c = new ConsistentKeyLocker.Builder(lockerStore).fromCommonsConfig(sc).mediatorName(concreteClassName + i).build();
                    store[i] = new ExpectedValueCheckingStore(store[i], c);
                    for (int j = 0; j < NUM_TX; j++)
                        tx[i][j] = new ExpectedValueCheckingTransaction(tx[i][j], manager[i].beginTransaction(new StoreTxConfig(ConsistencyLevel.KEY_CONSISTENT)), GraphDatabaseConfiguration.READ_ATTEMPTS_DEFAULT);
                } else throw new IllegalArgumentException("Store needs to support some form of locking");
            }
        }

            if (storeFeatures.supportsTransactions()) {
                store = new TransactionalLockStore(store);
            } else if (storeFeatures.supportsConsistentKeyOperations()) {
                if (lockEnabled) {
                    final String lockerName = store.getName() + LOCK_STORE_SUFFIX;
                    store = new ExpectedValueCheckingStore(store, getLocker(lockerName));
                } else {
                    store = new ExpectedValueCheckingStore(store, null);
                }
            } else throw new IllegalArgumentException("Store needs to support some form of locking");
        }
        return store;
    }

Examples of com.thinkaurelius.titan.diskstorage.locking.consistentkey.ExpectedValueCheckingStore

Related Classes of com.thinkaurelius.titan.diskstorage.locking.consistentkey.ExpectedValueCheckingStore