OpenJDK 27 · sun.nio.ch.DatagramChannelImpl · APIdia, the JavaDoc alternative

Modifier and Type	Class and Description
private static class	DatagramChannelImpl.AbstractSelectableChannels Defines static methods to access AbstractSelectableChannel non-public members.
private static class	DatagramChannelImpl.DatagramPackets Defines static methods to get/set DatagramPacket fields and workaround DatagramPacket deficiencies.
private static class	DatagramChannelImpl.DefaultOptionsHolder

Modifier and Type	Field and Description
private InetSocketAddress	cachedInetSocketAddress
private NativeSocketAddress	cachedSockAddr
private final Cleaner.Cleanable	cleaner
private final ProtocolFamily	family
private final FileDescriptor	fd
private final int	fdVal
private volatile boolean	forcedNonBlocking
private InetSocketAddress	initialLocalAddress
private final boolean	interruptible
private boolean	isReuseAddress
private InetSocketAddress	localAddress
private static final NativeDispatcher	nd
private static final JavaNioAccess	NIO_ACCESS
private int	previousSockAddrLength
private InetSocketAddress	previousTarget
private Thread	readerThread
private final ReentrantLock	readLock
private MembershipRegistry	registry
private InetSocketAddress	remoteAddress
private boolean	reuseAddressEmulated
private static final VarHandle	SOCKET
private volatile DatagramSocket	socket
private NativeSocketAddress	sourceSockAddr
private static final int	ST_CLOSED
private static final int	ST_CLOSING
private static final int	ST_CONNECTED
private static final int	ST_UNCONNECTED
private int	state
private final Object	stateLock
private final NativeSocketAddress	targetSockAddr
private final ReentrantLock	writeLock
private Thread	writerThread

Access	Constructor and Description
pack-priv	DatagramChannelImpl(SelectorProvider sp, boolean interruptible)
pack-priv	DatagramChannelImpl(SelectorProvider sp, ProtocolFamily family, boolean interruptible)
pack-priv	DatagramChannelImpl(SelectorProvider sp, FileDescriptor fd)

Method Summary

Modifier and Type	Method and Description
private SocketAddress	Returns: remote address if connected beginRead(boolean true if configured blocking blocking, boolean true if the socket must be connected mustBeConnected) Marks the beginning of a read operation that might block.
private SocketAddress	Returns: remote address if connected beginWrite(boolean true if configured blocking blocking, boolean true if the socket must be connected mustBeConnected) Marks the beginning of a write operation that might block.
public DatagramChannel	bind(SocketAddress local) Implements abstract java.nio.channels.DatagramChannel.bind. Implements java.nio.channels.NetworkChannel.bind. Binds the channel's socket to a local address.
private void	bindInternal(SocketAddress local)
pack-priv void	block(MembershipKeyImpl key, InetAddress source) Block datagrams from the given source.
pack-priv void	blockingReceive(DatagramPacket p, long nanos) Receives a datagram.
pack-priv void	blockingSend(DatagramPacket p) Sends a datagram.
private void	configureSocketNonBlocking() Ensures that the socket is configured non-blocking.
private void	configureSocketNonBlockingIfVirtualThread() Ensures that the socket is configured non-blocking when on a virtual thread.
public DatagramChannel	connect(SocketAddress sa) Implements abstract java.nio.channels.DatagramChannel.connect. Connects this channel's socket.
pack-priv DatagramChannel	connect(SocketAddress the remote address to which this channel is to be connected sa, boolean true to check if the channel is already connected. check) Connects the channel's socket.
public DatagramChannel	disconnect() Implements abstract java.nio.channels.DatagramChannel.disconnect. Disconnects this channel's socket.
private static native void	disconnect0(FileDescriptor fd, boolean isIPv6)
pack-priv void	drop(MembershipKeyImpl key)
private void	endRead(boolean blocking, boolean completed) Marks the end of a read operation that may have blocked.
private void	endWrite(boolean blocking, boolean completed) Marks the end of a write operation that may have blocked.
private void	ensureOpen()
private ProtocolFamily	familyFor(SocketOption<?> name) Returns the protocol family to specify to set/getSocketOption for the given socket option.
pack-priv MembershipKey	findMembership(InetAddress group, NetworkInterface interf) Finds an existing membership of a multicast group.
public FileDescriptor	getFD() Implements sun.nio.ch.SelChImpl.getFD.
public int	getFDVal() Implements sun.nio.ch.SelChImpl.getFDVal.
public SocketAddress	getLocalAddress() Implements abstract java.nio.channels.DatagramChannel.getLocalAddress. Implements java.nio.channels.NetworkChannel.getLocalAddress. Returns the socket address that this channel's socket is bound to.
public <T> T	getOption(SocketOption<T> name) Implements java.nio.channels.NetworkChannel.getOption. Returns the value of a socket option.
public SocketAddress	getRemoteAddress() Implements abstract java.nio.channels.DatagramChannel.getRemoteAddress. Returns the remote address to which this channel's socket is connected.
private void	implCloseBlockingMode() Closes this channel when configured in blocking mode.
private void	implCloseNonBlockingMode() Closes this channel when configured in non-blocking mode.
protected void	implCloseSelectableChannel() Implements abstract java.nio.channels.spi.AbstractSelectableChannel.implCloseSelectableChannel. Invoked by implCloseChannel to close the channel.
protected void	implConfigureBlocking(boolean block) Implements abstract java.nio.channels.spi.AbstractSelectableChannel.implConfigureBlocking. Adjusts this channel's blocking mode.
private MembershipKey	innerJoin(InetAddress group, NetworkInterface interf, InetAddress source) Joins channel's socket to the given group/interface and optional source address.
public boolean	isConnected() Implements abstract java.nio.channels.DatagramChannel.isConnected. Tells whether or not this channel's socket is connected.
public MembershipKey	join(InetAddress group, NetworkInterface interf) Implements java.nio.channels.MulticastChannel.join. Joins a multicast group to begin receiving all datagrams sent to the group, returning a membership key.
public MembershipKey	join(InetAddress group, NetworkInterface interf, InetAddress source) Implements java.nio.channels.MulticastChannel.join. Joins a multicast group to begin receiving datagrams sent to the group from a given source address.
public void	kill() Implements sun.nio.ch.SelChImpl.kill.
pack-priv InetSocketAddress	localAddress()
private void	lockedConfigureBlocking(boolean block) Adjusts the blocking mode.
public void	park(int event, long nanos) Overrides default sun.nio.ch.SelChImpl.park. Disables the current thread for scheduling purposes until this channel is ready for I/O, or asynchronously closed, for up to the specified waiting time.
public int	read(ByteBuffer buf) Implements abstract java.nio.channels.DatagramChannel.read. Implements java.nio.channels.ReadableByteChannel.read. Reads a datagram from this channel.
public long	read(ByteBuffer[] dsts, int offset, int length) Implements abstract java.nio.channels.DatagramChannel.read. Implements java.nio.channels.ScatteringByteChannel.read. Reads a datagram from this channel.
public SocketAddress	receive(ByteBuffer dst) Implements abstract java.nio.channels.DatagramChannel.receive. Receives a datagram via this channel.
private int	receive(ByteBuffer dst, boolean true if the channel is connected connected) Receives a datagram into the buffer.
private static native int	receive0(FileDescriptor fd, long address, int len, long senderAddress, boolean connected)
private int	receiveIntoNativeBuffer(ByteBuffer bb, int rem, int pos, boolean connected) Receives a datagram into a direct buffer.
private static Runnable	releaserFor(FileDescriptor fd, NativeSocketAddress... sockAddrs) Returns an action to release the given file descriptor and socket addresses.
pack-priv InetSocketAddress	remoteAddress()
private void	repairSocket(InetSocketAddress target) "Repair" the channel's socket after a disconnect that didn't restore the local address.
public int	send(ByteBuffer src, SocketAddress target) Implements abstract java.nio.channels.DatagramChannel.send. Sends a datagram via this channel.
private int	send(FileDescriptor fd, ByteBuffer src, InetSocketAddress target)
private static native int	send0(FileDescriptor fd, long address, int len, long targetAddress, int targetAddressLen)
private int	sendFromNativeBuffer(FileDescriptor fd, ByteBuffer bb, InetSocketAddress target) Send a datagram contained in a direct buffer.
public <T> DatagramChannel	setOption(SocketOption<T> name, T value) Implements abstract java.nio.channels.DatagramChannel.setOption. Implements java.nio.channels.NetworkChannel.setOption. Sets the value of a socket option.
public DatagramSocket	socket() Implements abstract java.nio.channels.DatagramChannel.socket. Retrieves a datagram socket associated with this channel.
private InetSocketAddress	sourceSocketAddress() Return an InetSocketAddress to represent the source/sender socket address in sourceSockAddr.
public final Set<SocketOption<?>>	supportedOptions() Implements java.nio.channels.NetworkChannel.supportedOptions. Returns a set of the socket options supported by this channel.
private int	targetSocketAddress(InetSocketAddress isa) Encodes the given InetSocketAddress into targetSockAddr, returning the length of the sockaddr structure (sizeof struct sockaddr or sockaddr6).
public boolean	translateAndSetReadyOps(int ops, SelectionKeyImpl ski) Implements sun.nio.ch.SelChImpl.translateAndSetReadyOps. Sets the specified ops if present in interestOps.
public boolean	translateAndUpdateReadyOps(int ops, SelectionKeyImpl ski) Implements sun.nio.ch.SelChImpl.translateAndUpdateReadyOps. Adds the specified ops if present in interestOps.
public int	translateInterestOps(int ops) Implements sun.nio.ch.SelChImpl.translateInterestOps. Translates an interest operation set into a native poll event set
public boolean	translateReadyOps(int ops, int initialOps, SelectionKeyImpl ski) Translates native poll revent set into a ready operation set
private ByteBuffer	Returns: a direct buffer containing the datagram or null if channel is closed tryBlockingReceive(boolean if the channel's socket is connected connected, int the maximum size of the datagram to receive len, long the timeout, should be Long.MAX_VALUE for untimed nanos) Attempt to receive a datagram.
private boolean	tryClose() Closes the socket if there are no I/O operations in progress and the channel is not registered with a Selector.
private void	tryFinishClose() Invokes tryClose to attempt to close the socket.
private boolean	Returns: `true` if the blocking mode was adjusted tryLockedConfigureBlocking(boolean block) Attempts to adjust the blocking mode if the channel is open.
pack-priv void	unblock(MembershipKeyImpl key, InetAddress source) Unblock the given source.
public int	write(ByteBuffer buf) Implements abstract java.nio.channels.DatagramChannel.write. Implements java.nio.channels.WritableByteChannel.write. Writes a datagram to this channel.
public long	write(ByteBuffer[] srcs, int offset, int length) Implements abstract java.nio.channels.DatagramChannel.write. Implements java.nio.channels.GatheringByteChannel.write. Writes a datagram to this channel.

Inherited from java.nio.channels.DatagramChannel:: open open read validOps write

pack-priv Class DatagramChannelImpl

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary