Mercurial > hg > graal-jvmci-8
diff graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/PrintStreamOption.java @ 16008:76f40e11c820
refactored HotSpotGraalRuntime.LogFileOption to PrintStreamOption to workaround a javac bug as well as to clarify its design
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jun 2014 17:13:52 +0200 |
parents | |
children | 66e3fc56e85f |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/PrintStreamOption.java Tue Jun 03 17:13:52 2014 +0200 @@ -0,0 +1,81 @@ +/* + * Copyright (c) 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.oracle.graal.hotspot; + +import java.io.*; + +import com.oracle.graal.options.*; + +/** + * An option that encapsulates and configures a print stream. + */ +public class PrintStreamOption extends OptionValue<String> { + + public PrintStreamOption() { + super(null); + } + + /** + * The print stream to which output will be written. + * + * Declared {@code volatile} to enable safe use of double-checked locking in + * {@link #getStream()} and {@link #setValue(Object)}. + */ + private volatile PrintStream ps; + + /** + * Gets the print stream configured by this option. + */ + public PrintStream getStream() { + if (ps == null) { + if (getValue() != null) { + synchronized (this) { + if (ps == null) { + try { + final boolean enableAutoflush = true; + ps = new PrintStream(new FileOutputStream(getValue()), enableAutoflush); + } catch (FileNotFoundException e) { + throw new RuntimeException("couldn't open file: " + getValue(), e); + } + } + } + } else { + ps = System.out; + } + } + return ps; + } + + @Override + public void setValue(Object v) { + if (ps != null) { + synchronized (this) { + if (ps != null) { + ps.close(); + ps = null; + } + } + } + super.setValue(v); + } +} \ No newline at end of file