java.nio.channels.spi

Class SelectorProvider


  • public abstract class SelectorProvider
    extends Object
    Service-provider class for selectors and selectable channels.

    A selector provider is a concrete subclass of this class that has a zero-argument constructor and implements the abstract methods specified below. A given invocation of the Java virtual machine maintains a single system-wide default provider instance, which is returned by the provider method. The first invocation of that method will locate the default provider as specified below.

    The system-wide default provider is used by the static open methods of the DatagramChannel, Pipe, Selector, ServerSocketChannel, and SocketChannel classes. It is also used by the System.inheritedChannel() method. A program may make use of a provider other than the default provider by instantiating that provider and then directly invoking the open methods defined in this class.

    All of the methods in this class are safe for use by multiple concurrent threads.

    Since:
    1.4
    • Constructor Detail

      • SelectorProvider

        protected SelectorProvider()
        Initializes a new instance of this class.

        Throws:
        SecurityException - If a security manager has been installed and it denies RuntimePermission("selectorProvider")
    • Method Detail

      • provider

        public static SelectorProvider provider()
        Returns the system-wide default selector provider for this invocation of the Java virtual machine.

        The first invocation of this method locates the default provider object as follows:

        1. If the system property java.nio.channels.spi.SelectorProvider is defined then it is taken to be the fully-qualified name of a concrete provider class. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.

        2. If a provider class has been installed in a jar file that is visible to the system class loader, and that jar file contains a provider-configuration file named java.nio.channels.spi.SelectorProvider in the resource directory META-INF/services, then the first class name specified in that file is taken. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.

        3. Finally, if no provider has been specified by any of the above means then the system-default provider class is instantiated and the result is returned.

        Subsequent invocations of this method return the provider that was returned by the first invocation.

        Returns:
        The system-wide default selector provider
      • inheritedChannel

        public Channel inheritedChannel()
                                 throws IOException
        Returns the channel inherited from the entity that created this Java virtual machine.

        On many operating systems a process, such as a Java virtual machine, can be started in a manner that allows the process to inherit a channel from the entity that created the process. The manner in which this is done is system dependent, as are the possible entities to which the channel may be connected. For example, on UNIX systems, the Internet services daemon (inetd) is used to start programs to service requests when a request arrives on an associated network port. In this example, the process that is started, inherits a channel representing a network socket.

        In cases where the inherited channel represents a network socket then the Channel type returned by this method is determined as follows:

        • If the inherited channel represents a stream-oriented connected socket then a SocketChannel is returned. The socket channel is, at least initially, in blocking mode, bound to a socket address, and connected to a peer.

        • If the inherited channel represents a stream-oriented listening socket then a ServerSocketChannel is returned. The server-socket channel is, at least initially, in blocking mode, and bound to a socket address.

        • If the inherited channel is a datagram-oriented socket then a DatagramChannel is returned. The datagram channel is, at least initially, in blocking mode, and bound to a socket address.

        In addition to the network-oriented channels described, this method may return other kinds of channels in the future.

        The first invocation of this method creates the channel that is returned. Subsequent invocations of this method return the same channel.

        Returns:
        The inherited channel, if any, otherwise null.
        Throws:
        IOException - If an I/O error occurs
        SecurityException - If a security manager has been installed and it denies RuntimePermission("inheritedChannel")
        Since:
        1.5

Traduction non disponible

Les API Java ne sont pas encore traduites en français sur l'infobrol. Seule la version anglaise est disponible pour l'instant.

Table des matières Haut

Document créé le 31/08/2006, dernière modification le 29/10/2018
Source du document imprimé : https://www.gaudry.be/java-api-rf-java/nio/channels/spi/selectorprovider.html

L'infobrol est un site personnel dont le contenu n'engage que moi. Le texte est mis à disposition sous licence CreativeCommons(BY-NC-SA). Plus d'info sur les conditions d'utilisation et sur l'auteur.

Références

  1. Consulter le document html Langue du document :fr Manuel PHP : https://docs.oracle.com, SelectorProvider

Ces références et liens indiquent des documents consultés lors de la rédaction de cette page, ou qui peuvent apporter un complément d'information, mais les auteurs de ces sources ne peuvent être tenus responsables du contenu de cette page.
L'auteur de ce site est seul responsable de la manière dont sont présentés ici les différents concepts, et des libertés qui sont prises avec les ouvrages de référence. N'oubliez pas que vous devez croiser les informations de sources multiples afin de diminuer les risques d'erreurs.

Table des matières Haut