philadelphia-core: Make Clock interface public and add javadoc
package com.paritytrading.philadelphia;
-interface Clock {
+/**
+ * A time source.
+ */
+public interface Clock {
+ /**
+ * Get the current time in milliseconds.
+ *
+ * @return the current time in milliseconds
+ * @see System#currentTimeMillis
+ */
long currentTimeMillis();
}
