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public class MyIoManagerListener implements IoManagerListener {
private static Logger logger = LoggerFactory.getLogger(MyIoManagerListener.class);

@Override
public AccessLevelType onGetUserAccessLevel(ServiceContext serviceContext, NodeId nodeId, UaVariable node) {
// The AccessLevel defines the accessibility of the Variable.Value
// attribute

// Define anonymous access
// if (serviceContext.getSession().getUserIdentity().getType()
// .equals(UserTokenType.Anonymous))
// return AccessLevelType.of();
if (node.getHistorizing()) {
return AccessLevelType.of(AccessLevelType.CurrentRead, AccessLevelType.CurrentWrite, AccessLevelType.HistoryRead);
} else {
return AccessLevelType.of(AccessLevelType.CurrentRead, AccessLevelType.CurrentWrite);
}
}

@Override
public Boolean onGetUserExecutable(ServiceContext serviceContext, NodeId nodeId, UaMethod node) {
// Enable execution of all methods that are allowed by default
return true;
}

@Override
public AttributeWriteMask onGetUserWriteMask(ServiceContext serviceContext, NodeId nodeId, UaNode node) {
// Enable writing to everything that is allowed by default
// The WriteMask defines the writable attributes, except for Value,
// which is controlled by UserAccessLevel (above)

// The following would deny write access for anonymous users:
// if
// (serviceContext.getSession().getUserIdentity().getType().equals(
// UserTokenType.Anonymous))
// return AttributeWriteMask.of();

return AttributeWriteMask.of(AttributeWriteMask.Fields.values());
}

@Override
public boolean onReadNonValue(ServiceContext serviceContext, NodeId nodeId, UaNode node, UnsignedInteger attributeId,
DataValue dataValue) throws StatusException {
return false;
}

@Override
public boolean onReadValue(ServiceContext serviceContext, NodeId nodeId, UaValueNode node, NumericRange indexRange,
TimestampsToReturn timestampsToReturn, DateTime minTimestamp, DataValue dataValue) throws StatusException {
if (logger.isDebugEnabled()) {
logger.debug("onReadValue: nodeId=" + nodeId + (node != null ? " node=" + node.getBrowseName() : ""));
}
return false;
}

@Override
public boolean onWriteNonValue(ServiceContext serviceContext, NodeId nodeId, UaNode node, UnsignedInteger attributeId,
DataValue dataValue) throws StatusException {
return false;
}

@Override
public boolean onWriteValue(ServiceContext serviceContext, NodeId nodeId, UaValueNode node, NumericRange indexRange,
DataValue dataValue) throws StatusException {
logger.info("onWriteValue: nodeId=" + nodeId + (node != null ? " node=" + node.getBrowseName() : "")
+ (indexRange != null ? " indexRange=" + indexRange : "") + " value=" + dataValue);
return false;
}
}