private DatastoreServiceConfig createDatastoreServiceConfigPrototype(
PersistenceConfiguration persistenceConfiguration, String... timeoutProps) {
DatastoreServiceConfig datastoreServiceConfig = DatastoreServiceConfig.Builder.withDefaults();
for (String timeoutProp : timeoutProps) {
int defaultDeadline = persistenceConfiguration.getIntProperty(timeoutProp);
if (defaultDeadline > 0) {
datastoreServiceConfig.deadline(defaultDeadline / 1000d);
}
}
String defaultReadConsistencyStr =
persistenceConfiguration.getStringProperty(DATASTORE_READ_CONSISTENCY_PROPERTY);
if (defaultReadConsistencyStr != null) {
try {
datastoreServiceConfig.readPolicy(
new ReadPolicy(Consistency.valueOf(defaultReadConsistencyStr)));
} catch (IllegalArgumentException iae) {
throw new NucleusFatalUserException(
"Illegal value for "
+ DATASTORE_READ_CONSISTENCY_PROPERTY
+ ". Valid values are "
+ Arrays.toString(Consistency.values()));
}
}
return datastoreServiceConfig;
}
// visible for testing
static DatastoreServiceConfig copyDatastoreServiceConfig(DatastoreServiceConfig config) {
DatastoreServiceConfig newConfig =
DatastoreServiceConfig.Builder.withImplicitTransactionManagementPolicy(
config.getImplicitTransactionManagementPolicy())
.readPolicy(config.getReadPolicy());
if (config.getDeadline() != null) {
newConfig.deadline(config.getDeadline());
}
return newConfig;
}
/** * Provides datastore instance to use. * * @author [email protected] (Christian Ohler) */ public class DatastoreProvider { private DatastoreProvider() {} private static final DatastoreService STRONG_READS = DatastoreServiceFactory.getDatastoreService( DatastoreServiceConfig.Builder.withDeadline(5 /*seconds*/) .implicitTransactionManagementPolicy(ImplicitTransactionManagementPolicy.NONE) .readPolicy(new ReadPolicy(ReadPolicy.Consistency.STRONG))); private static final DatastoreService EVENTUAL_READS = DatastoreServiceFactory.getDatastoreService( DatastoreServiceConfig.Builder.withDeadline(5 /*seconds*/) .implicitTransactionManagementPolicy(ImplicitTransactionManagementPolicy.NONE) .readPolicy(new ReadPolicy(ReadPolicy.Consistency.EVENTUAL))); public static DatastoreService strongReads() { return STRONG_READS; } public static DatastoreService eventualReads() { return EVENTUAL_READS; } }
