X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ff6cb26262ba25fefdf1265628265a75d790ebd6..200986a368bbbbb5df459d43cbc7f5ef3d7678db:/contrib/psg/src/peersim/core/Fallible.java

diff --git a/contrib/psg/src/peersim/core/Fallible.java b/contrib/psg/src/peersim/core/Fallible.java
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+/*
+ * Copyright (c) 2003-2005 The BISON Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+		
+package peersim.core;
+
+
+/**
+* Instances of classes implementing this interface
+* maintain a fail state, i.e. information about the availability
+* of the object.
+*/
+public interface Fallible {
+ 
+
+	/**
+	* Fail state which indicates that the object is operating normally.
+	*/
+	public int OK = 0;
+
+	/**
+	* Fail state indicating that the object is dead and recovery is
+	* not possible. When this state is set, it is a good idea to make sure
+	* that the state of the object becomes such that any attempt to
+	* operate on it causes a visible error of some kind.
+	*/
+	public int DEAD = 1;
+
+	/**
+	* Fail state indicating that the object is not dead, but is temporarily
+	* not accessible.
+	*/
+	public int DOWN = 2;
+
+	/**
+	* Returns the state of this object. Must be one of the constants
+	* defined in interface {@link Fallible}.
+	*/
+	public int getFailState();
+	
+	/**
+	* Sets the fails state of this object. Parameter must be one of the
+	* constants defined in interface {@link Fallible}.
+	*/
+	public void setFailState(int failState);
+
+	/**
+	* Convenience method to check if the node is up and running
+	* @return must return true if and only if
+	* <code>getFailState()==OK</code>
+	*/
+	public boolean isUp();
+}
+
+