Fixes AMQ-6441 where a negative value can be returned with large AWS EFS files systems when calling java.io.File.getTotalSpace()

activemq-unit-tests/src/test/java/org/apache/activemq/util/LargeFile.java

@@ -0,0 +1,25 @@
+package org.apache.activemq.util;
+
+import java.io.File;
+
+/**
+ * @author wcrowell
+ * 
+ * LargeFile is used to simulate a large file system (e.g. exabytes in size).
+ * The getTotalSpace() method is intentionally set to exceed the largest 
+ * value of a primitive long which is 9,223,372,036,854,775,807.  A negative
+ * number will be returned when getTotalSpace() is called.  This class is for
+ * test purposes only.  Using a mocking framework to mock the behavior of 
+ * java.io.File was a lot of work.
+ * 
+ */
+public class LargeFile extends File {
+	public LargeFile(File parent, String child) {
+		super(parent, child);
+	}
+	
+	@Override
+	public long getTotalSpace() {
+		return Long.MAX_VALUE + 4193L;
+	}
+}