/// <summary>
/// Create a new Node for communication with an NDN hub with the given
/// Transport object and connectionInfo.
/// </summary>
///
/// <param name="transport">A Transport object used for communication.</param>
/// <param name="connectionInfo"></param>
public Node(Transport transport, Transport.ConnectionInfo connectionInfo)
{
this.pendingInterestTable_ = new PendingInterestTable();
this.interestFilterTable_ = new InterestFilterTable();
this.registeredPrefixTable_ = new RegisteredPrefixTable(
interestFilterTable_);
this.delayedCallTable_ = new DelayedCallTable();
this.onConnectedCallbacks_ = ILOG.J2CsMapping.Collections.Collections
.synchronizedList(new ArrayList());
this.commandInterestGenerator_ = new CommandInterestGenerator();
this.timeoutPrefix_ = new Name("/local/timeout");
this.lastEntryIdLock_ = new Object();
this.connectStatus_ = net.named_data.jndn.Node.ConnectStatus.UNCONNECTED;
transport_ = transport;
connectionInfo_ = connectionInfo;
}
/// <summary>
/// Send the Interest through the transport, read the entire response and call
/// onData, onTimeout or onNetworkNack as described below.
/// </summary>
///
/// <param name="pendingInterestId"></param>
/// <param name="interestCopy">to use.</param>
/// <param name="onData">expressInterest and data is the received Data object.</param>
/// <param name="onTimeout">interest given to expressInterest. If onTimeout is null, this does not use it.</param>
/// <param name="onNetworkNack">onNetworkNack.onNetworkNack(interest, networkNack) and does not call onTimeout. However, if a network Nack is received and onNetworkNack is null, do nothing and wait for the interest to time out.</param>
/// <param name="wireFormat">A WireFormat object used to encode the message.</param>
/// <param name="face"></param>
/// <exception cref="IOException">For I/O error in sending the interest.</exception>
/// <exception cref="System.Exception">If the encoded interest size exceeds getMaxNdnPacketSize().</exception>
public void expressInterest(long pendingInterestId,
Interest interestCopy, OnData onData,
OnTimeout onTimeout, OnNetworkNack onNetworkNack,
WireFormat wireFormat, Face face)
{
// Set the nonce in our copy of the Interest so it is saved in the PIT.
interestCopy.setNonce(nonceTemplate_);
interestCopy.refreshNonce();
if (connectStatus_ == net.named_data.jndn.Node.ConnectStatus.CONNECT_COMPLETE) {
// We are connected. Simply send the interest without synchronizing.
expressInterestHelper(pendingInterestId, interestCopy, onData,
onTimeout, onNetworkNack, wireFormat, face);
return;
}
lock (onConnectedCallbacks_) {
// TODO: Properly check if we are already connected to the expected host.
if (!transport_.isAsync()) {
// The simple case: Just do a blocking connect and express.
transport_.connect(connectionInfo_, this, null);
expressInterestHelper(pendingInterestId, interestCopy, onData,
onTimeout, onNetworkNack, wireFormat, face);
// Make future calls to expressInterest send directly to the Transport.
connectStatus_ = net.named_data.jndn.Node.ConnectStatus.CONNECT_COMPLETE;
return;
}
// Handle the async case.
if (connectStatus_ == net.named_data.jndn.Node.ConnectStatus.UNCONNECTED) {
connectStatus_ = net.named_data.jndn.Node.ConnectStatus.CONNECT_REQUESTED;
// expressInterestHelper will be called by onConnected.
ILOG.J2CsMapping.Collections.Collections.Add(onConnectedCallbacks_,new Node.Anonymous_C3 (this, interestCopy, onNetworkNack, face,
onTimeout, pendingInterestId, wireFormat, onData));
IRunnable onConnected = new Node.Anonymous_C2 (this);
transport_.connect(connectionInfo_, this, onConnected);
} else if (connectStatus_ == net.named_data.jndn.Node.ConnectStatus.CONNECT_REQUESTED) {
// Still connecting. add to the interests to express by onConnected.
ILOG.J2CsMapping.Collections.Collections.Add(onConnectedCallbacks_,new Node.Anonymous_C1 (this, interestCopy, onData, onTimeout,
onNetworkNack, wireFormat, face, pendingInterestId));
} else if (connectStatus_ == net.named_data.jndn.Node.ConnectStatus.CONNECT_COMPLETE)
// We have to repeat this check for CONNECT_COMPLETE in case the
// onConnected callback was called while we were waiting to enter this
// synchronized block.
expressInterestHelper(pendingInterestId, interestCopy, onData,
onTimeout, onNetworkNack, wireFormat, face);
else
// Don't expect this to happen.
throw new Exception("Node: Unrecognized _connectStatus "
+ connectStatus_);
}
}
