ExecutionEnv.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 *
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package jdk.jshell.spi;

import java.io.InputStream;
import java.io.PrintStream;
import java.util.List;
import jdk.jshell.JShell;

/**
 * Functionality made available to a pluggable JShell execution engine.  It is
 * provided to the execution engine by the core JShell implementation.
 * <p>
 * This interface is designed to provide the access to core JShell functionality
 * needed to implement ExecutionControl.
 *
 * @see ExecutionControl
 */
public interface ExecutionEnv {

    /**
     * Returns the user's input stream.
     *
     * @return the user's input stream
     */
    InputStream userIn();

    /**
     * Returns the user's output stream.
     *
     * @return the user's output stream
     */
    PrintStream userOut();

    /**
     * Returns the user's error stream.
     *
     * @return the user's error stream
     */
    PrintStream userErr();

    /**
     * Returns the additional VM options to be used when launching the remote
     * JVM. This is advice to the execution engine.
     * <p>
     * Note: an execution engine need not launch a remote JVM.
     *
     * @return the additional options with which to launch the remote JVM
     */
    List<String> extraRemoteVMOptions();

    /**
     * Reports that the execution engine has shutdown.
     */
    void closeDown();

}