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CommandRunner.java
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CommandRunner.java
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/*
* Copyright 2006-2021 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.batch.core.step.tasklet;
import java.io.File;
import java.io.IOException;
/**
* Interface for executing commands. This abstraction is only
* useful in order to allow classes that make {@link Runtime#exec} calls
* to be testable, since the invoked command might not be
* available during tests execution.
*
* @author Stefano Cordio
* @since FIXME
*/
public interface CommandRunner {
/**
* Executes the specified string command in a separate process with the
* specified environment and working directory.
*
* @param command a specified system command.
*
* @param envp array of strings, each element of which
* has environment variable settings in the format
* <i>name</i>=<i>value</i>, or
* {@code null} if the subprocess should inherit
* the environment of the current process.
*
* @param dir the working directory of the subprocess, or
* {@code null} if the subprocess should inherit
* the working directory of the current process.
*
* @return A new {@link Process} object for managing the subprocess
*
* @throws SecurityException
* If a security manager exists and its
* {@link SecurityManager#checkExec checkExec}
* method doesn't allow creation of the subprocess
*
* @throws IOException
* If an I/O error occurs
*
* @throws NullPointerException
* If {@code command} is {@code null},
* or one of the elements of {@code envp} is {@code null}
*
* @throws IllegalArgumentException
* If {@code command} is empty
*
* @see Runtime#exec(String, String[], File)
*/
Process exec(String command, String[] envp, File dir) throws IOException;
}