compileclose.java

来自「是一款用JAVA 编写的编译器 具有很强的编译功能」· Java 代码 · 共 78 行

/*
 * Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 5071352
 * @summary Make sure compiler closes all open files on Windows
 * @author Martin Buchholz
 *
 * @run main/othervm -Xms200m -Xmx200m CompileClose
 */

// -Xms120m is sufficient to inhibit a gc during a compile.
// -Xms200m leaves room for expansion and was used by the customer.

import java.io.*;

public class CompileClose {
    static void writeFile(String f, String contents) throws IOException {
	PrintStream s = new PrintStream(new FileOutputStream(f));
	s.println(contents);
	s.close();
    }

    static void rm(String filename) throws Exception {
	File f = new File(filename);
	f.delete();
	if (f.exists())
	    throw new Exception(filename + ": couldn't remove");
    }

    static void clean() throws Exception {
	rm("tmpCompileClose.java");
	rm("tmpCompileClose.class");
	rm("tmpCompileClose.jar");
    }

    public static void main(String args[]) throws Exception {
	try {
	    clean();
	    main1();
	} finally {
	    clean();
	}
    }

    static void main1() throws Exception {
	writeFile("tmpCompileClose.java",
		  "public class tmpCompileClose {}");
	// Any old jar file will do
	SameJVM.jar("cf", "tmpCompileClose.jar", "tmpCompileClose.java");
	System.gc(); // Inhibit gc during next compile
	SameJVM.javac("-cp", "tmpCompileClose.jar", "tmpCompileClose.java");
	// The following rm is the actual test!
        rm("tmpCompileClose.jar");
    }
}