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+/* DelegatedTask.java --
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.javax.net.ssl.provider;
+
+import gnu.classpath.debug.Component;
+import gnu.classpath.debug.SystemLogger;
+
+/**
+ * @author Casey Marshall (csm@gnu.org)
+ */
+public abstract class DelegatedTask implements Runnable
+{
+ private static final SystemLogger logger = SystemLogger.SYSTEM;
+ private boolean hasRun;
+ protected Throwable thrown;
+
+ protected DelegatedTask()
+ {
+ hasRun = false;
+ }
+
+ public final void run()
+ {
+ if (hasRun)
+ throw new IllegalStateException("task already ran");
+ try
+ {
+ if (Debug.DEBUG)
+ logger.logv(Component.SSL_DELEGATED_TASK,
+ "running delegated task {0} in {1}", this,
+ Thread.currentThread());
+ implRun();
+ }
+ catch (Throwable t)
+ {
+ if (Debug.DEBUG)
+ logger.log(Component.SSL_DELEGATED_TASK, "task threw exception", t);
+ thrown = t;
+ }
+ finally
+ {
+ hasRun = true;
+ }
+ }
+
+ public final boolean hasRun()
+ {
+ return hasRun;
+ }
+
+ public final Throwable thrown()
+ {
+ return thrown;
+ }
+
+ protected abstract void implRun() throws Throwable;
+}