2006-12-10 Andrew John Hughes <gnu_andrew@member.fsf.org>

	* Merge of generics-branch to HEAD (woohoo!)

1 files changed, 36 insertions, 0 deletions

diff --git a/external/jsr166/java/util/concurrent/Callable.java b/external/jsr166/java/util/concurrent/Callable.java
new file mode 100644
index 000000000..abc4d0407
--- /dev/null
+++ b/external/jsr166/java/util/concurrent/Callable.java
@@ -0,0 +1,36 @@
+/*
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/licenses/publicdomain
+ */
+
+package java.util.concurrent;
+
+/**
+ * A task that returns a result and may throw an exception.
+ * Implementors define a single method with no arguments called
+ * <tt>call</tt>.
+ *
+ * <p>The <tt>Callable</tt> interface is similar to {@link
+ * java.lang.Runnable}, in that both are designed for classes whose
+ * instances are potentially executed by another thread.  A
+ * <tt>Runnable</tt>, however, does not return a result and cannot
+ * throw a checked exception.
+ *
+ * <p> The {@link Executors} class contains utility methods to
+ * convert from other common forms to <tt>Callable</tt> classes.
+ *
+ * @see Executor
+ * @since 1.5
+ * @author Doug Lea
+ * @param <V> the result type of method <tt>call</tt>
+ */
+public interface Callable<V> {
+    /**
+     * Computes a result, or throws an exception if unable to do so.
+     *
+     * @return computed result
+     * @throws Exception if unable to compute a result
+     */
+    V call() throws Exception;
+}