Shutdown manager (untested on Windows).

api/net/sf/briar/api/lifecycle/ShutdownManager.java

@@ -0,0 +1,16 @@
+package net.sf.briar.api.lifecycle;
+
+public interface ShutdownManager {
+
+	/**
+	 * Registers a hook to be run when the JVM shuts down and returns a handle
+	 * that can be used to remove the hook.
+	 */
+	int addShutdownHook(Runnable hook);
+
+	/**
+	 * Removes the shutdown hook identified by the given handle and returns
+	 * true if the hook was removed.
+	 */
+	boolean removeShutdownHook(int handle);
+}