/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.sshd.server;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Represents a command, shell or subsystem that can be used to send command.
*
* This command have direct streams, meaning those streams will be provided by the ssh server
* for the shell to use directy. This interface is suitable for implementing commands in java,
* rather than using external processes. For wrapping such processes or using inverted streams,
* see {@link org.apache.sshd.server.shell.InvertedShellWrapper}.
*/
public interface Command {
/**
* Set the input stream that can be used by the shell to read input.
* @param in
*/
void setInputStream(InputStream in);
/**
* Set the output stream that can be used by the shell to write its output.
* @param out
*/
void setOutputStream(OutputStream out);
/**
* Set the error stream that can be used by the shell to write its errors.
* @param err
*/
void setErrorStream(OutputStream err);
/**
* Set the callback that the shell has to call when it is closed.
* @param callback
*/
void setExitCallback(ExitCallback callback);
/**
* Starts the shell.
* All streams must have been set before calling this method.
*
* @param env
* @throws java.io.IOException
*/
void start(Environment env) throws IOException;
/**
* Destroy the shell.
* This method can be called by the SSH server to destroy the shell because
* the client has disconnected somehow.
*/
void destroy();
}