# HG changeset patch
# User Doug Simon <doug.simon@oracle.com>
# Date 1385396895 -3600
# Node ID 53b1edcf628f2220f58d2d796d368c14950c57a3
# Parent  ca10e53c03ab0a0b145f3a38477528ad42c95845
added support for scoping a change to the current DebugConfig using try-with-resource

diff -r ca10e53c03ab -r 53b1edcf628f graal/com.oracle.graal.debug/src/com/oracle/graal/debug/Debug.java
--- a/graal/com.oracle.graal.debug/src/com/oracle/graal/debug/Debug.java	Mon Nov 25 17:25:53 2013 +0100
+++ b/graal/com.oracle.graal.debug/src/com/oracle/graal/debug/Debug.java	Mon Nov 25 17:28:15 2013 +0100
@@ -376,9 +376,19 @@
         }
     }
 
-    public static void setConfig(DebugConfig config) {
+    /**
+     * Changes the debug configuration for the current thread.
+     * 
+     * @param config new configuration to use for the current thread
+     * @return an object that when {@linkplain DebugConfigScope#close() closed} will restore the
+     *         debug configuration for the current thread to what it was before this method was
+     *         called
+     */
+    public static DebugConfigScope setConfig(DebugConfig config) {
         if (ENABLED) {
-            DebugScope.getInstance().setConfig(config);
+            return new DebugConfigScope(config);
+        } else {
+            return null;
         }
     }
 
diff -r ca10e53c03ab -r 53b1edcf628f graal/com.oracle.graal.debug/src/com/oracle/graal/debug/DebugConfigScope.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.debug/src/com/oracle/graal/debug/DebugConfigScope.java	Mon Nov 25 17:28:15 2013 +0100
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2012, 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.debug;
+
+import com.oracle.graal.debug.internal.*;
+
+/**
+ * A utility for scoping a change to the current debug
+ * {@linkplain DebugScope#setConfig(DebugConfig) configuration}. For example:
+ * 
+ * <pre>
+ *     DebugConfig config = ...;
+ *     try (DebugConfigScope s = new DebugConfigScope(config)) {
+ *         // ...
+ *     }
+ * </pre>
+ */
+public class DebugConfigScope implements AutoCloseable {
+
+    private final DebugConfig current;
+
+    /**
+     * Sets the current debug {@linkplain DebugScope#setConfig(DebugConfig) configuration} to a
+     * given value and creates an object that when {@linkplain #close() closed} resets the
+     * configuration to the {@linkplain DebugScope#getConfig() current} configuration.
+     */
+    public DebugConfigScope(DebugConfig config) {
+        this.current = DebugScope.getConfig();
+        DebugScope.getInstance().setConfig(config);
+    }
+
+    public void close() {
+        DebugScope.getInstance().setConfig(current);
+    }
+}
diff -r ca10e53c03ab -r 53b1edcf628f graal/com.oracle.graal.debug/src/com/oracle/graal/debug/DelegatingDebugConfig.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.debug/src/com/oracle/graal/debug/DelegatingDebugConfig.java	Mon Nov 25 17:28:15 2013 +0100
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2013, 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.debug;
+
+import java.io.*;
+import java.util.*;
+
+public class DelegatingDebugConfig implements DebugConfig {
+
+    protected final DebugConfig delegate;
+
+    public DelegatingDebugConfig(DebugConfig delegate) {
+        this.delegate = delegate;
+    }
+
+    @Override
+    public boolean isLogEnabled() {
+        return delegate.isLogEnabled();
+    }
+
+    @Override
+    public boolean isMeterEnabled() {
+        return delegate.isMeterEnabled();
+    }
+
+    @Override
+    public boolean isDumpEnabled() {
+        return delegate.isDumpEnabled();
+    }
+
+    @Override
+    public boolean isTimeEnabled() {
+        return delegate.isTimeEnabled();
+    }
+
+    @Override
+    public RuntimeException interceptException(Throwable e) {
+        return delegate.interceptException(e);
+    }
+
+    @Override
+    public Collection<DebugDumpHandler> dumpHandlers() {
+        return delegate.dumpHandlers();
+    }
+
+    @Override
+    public PrintStream output() {
+        return delegate.output();
+    }
+
+    @Override
+    public void addToContext(Object o) {
+        delegate.addToContext(o);
+    }
+
+    @Override
+    public void removeFromContext(Object o) {
+        delegate.removeFromContext(o);
+    }
+}