Package de.gebit.integrity.runner.forking

Class LocalForkedProcess

  • All Implemented Interfaces:
    ForkedProcess
    public class LocalForkedProcess
extends Object
implements ForkedProcess
    A forked process implementation that wraps a local process.
    Author:
    Rene Schneider - initial API and implementation

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected Process process
      The OS process encapsulated.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      InputStream getErrorStream()
      Returns the stream carrying standard error (STDERR) of the process.
      String getHost()
      Returns the network host name where this process is running.
      InputStream getInputStream()
      Returns the stream carrying standard output (STDOUT) of the process.
      int getPort()
      Returns the port where this processes' Integrity Test Runner is open for management connections.
      boolean isAlive()
      Checks whether the forked process is up and running.
      void kill()
      Kills the forked process, if it is running, and waits for it to exit.

      This functionality is not strictly required, since a test runner process should always end itself after finishing all its tests, which then leads to the forks automatically exiting gracefully after doing their duty as well.

    • Field Detail

      • process

        protected Process process
        The OS process encapsulated.

    • Constructor Detail

      • LocalForkedProcess

        public LocalForkedProcess​(Process aProcess)
        Creates a new instance.
        Parameters:
        aProcess - the process to wrap

    • Method Detail

      • isAlive

        public boolean isAlive()
        Description copied from interface: ForkedProcess
        Checks whether the forked process is up and running. This is a mandatory method.
        Specified by:
        isAlive in interface ForkedProcess
        Returns:
        true if the process is running, false if it has ended or not even started (for example due to an error)

      • kill

        public void kill()
        Description copied from interface: ForkedProcess
        Kills the forked process, if it is running, and waits for it to exit.

        This functionality is not strictly required, since a test runner process should always end itself after finishing all its tests, which then leads to the forks automatically exiting gracefully after doing their duty as well. But in case a fork got started, but it is impossible for the main process to create a remoting connection to it, the main process will call this method in order to ensure clean termination of the forked process, which would otherwise sit there forever and wait for its master to connect.
        Specified by:
        kill in interface ForkedProcess

      • getInputStream

        public InputStream getInputStream()
        Description copied from interface: ForkedProcess
        Returns the stream carrying standard output (STDOUT) of the process. Supporting this kind of communication is optional.
        Specified by:
        getInputStream in interface ForkedProcess
        Returns:
        a ready-to-be-read InputStream or null if this is not supported by the forked process

      • getErrorStream

        public InputStream getErrorStream()
        Description copied from interface: ForkedProcess
        Returns the stream carrying standard error (STDERR) of the process. Supporting this kind of communication is optional.
        Specified by:
        getErrorStream in interface ForkedProcess
        Returns:
        a ready-to-be-read InputStream or null if this is not supported by the forked process

      • getHost

        public String getHost()
        Description copied from interface: ForkedProcess
        Returns the network host name where this process is running. In case of local processes, "localhost" shall be returned, but distributed processes on other machines might of course return different values. This is a mandatory method if the forks' STDOUT stream is not available (through which host and port would otherwise be communicated to the master) OR if the host communicated via STDOUT is a wildcard address, otherwise it is optional and will not be called. It may return "null" as long as the fork has not yet brought up its remoting network binding - in that case, the connection attempts are paused until remoting is available.
        Specified by:
        getHost in interface ForkedProcess
        Returns:
        the network host name where the process is running, or null if the process is not yet available for connection

      • getPort

        public int getPort()
        Description copied from interface: ForkedProcess
        Returns the port where this processes' Integrity Test Runner is open for management connections. This is a mandatory method if the forks' STDOUT stream is not available (through which host and port would otherwise be communicated to the master), otherwise it is optional and will not be called. If ForkedProcess.getHost() returns a non-null value, this method must return a meaningful value as well (it will also not be called before ForkedProcess.getHost() was called and returned a non-null value, so it doesn't matter what it returns before that point in time, or if it is even callable).
        Specified by:
        getPort in interface ForkedProcess
        Returns:
        the remoting port of the test runner