be silently discarded. Invoking send() sends the content
By the same token, when a DatagramChannel is connected, you cannot send to any destination address except the one given to the connect() method. Attempting to do so results in a SecurityException. Connect a DatagramChannel by calling its connect() method with a SocketAddress object describing the address of the remote peer. If a security manager is installed, it’s consulted to check permission. Thereafter, the security check overhead will not be incurred on each send/receive because packets to or from any other address are not allowed. A scenario in which connected channels might be useful is a real-time, client/server game using UDP communication. Any given client will always be talking to the same server and wants to ignore packets from any other source. Placing the client’s DatagramChannel instance in a connected state reduces the per-packet overhead (because security checks are not needed on each packet) and filters out bogus packets from cheating players. The server may want to do the same thing, but doing so requires a DatagramChannel object for each client. Unlike stream sockets, the stateless nature of datagram sockets does not require a dialog with the remote system to set up connection state. There is no actual connection, just local state information that designates the allowed remote address. For this reason, there is no separate finishConnect() method on DatagramChannel. The connected state of a datagram channel can be tested with the isConnected() method. Unlike SocketChannel, which must be connected to be useful and can connect only once, a DatagramChannel object can transition in and out of connected state any number of times. Each connection can be to a different remote address. Invoking disconnect() configures the channel so that it can once again receive from, or send to, any remote address as allowed by the security manager, if one is installed. While a DatagramChannel is connected, it’s not necessary to supply the destination address when sending, and the source address is known when receiving. This means that the conventional read() and write() methods can be used on a DatagramChannel while it’s connected, including the scatter/gather versions to assemble or disassemble packet data: public abstract class DatagramChannel extends AbstractSelectableChannel implements ByteChannel, ScatteringByteChannel, GatheringByteChannel { // This is a partial API listing public abstract int read (ByteBuffer dst) throws IOException; public abstract long read (ByteBuffer [] dsts) throws IOException; public abstract long read (ByteBuffer [] dsts, int offset, int length) throws IOException; public abstract int write (ByteBuffer src) throws IOException; 114
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