Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Runtime.Caching/System/Caching/CacheItemPolicy.cs

@@ -0,0 +1,56 @@
+// <copyright file="CacheItemPolicy.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+using System;
+using System.Collections.ObjectModel;
+
+namespace System.Runtime.Caching {
+    public class CacheItemPolicy {
+        private DateTimeOffset _absExpiry;
+        private TimeSpan _sldExpiry;
+        private Collection<ChangeMonitor> _changeMonitors;
+        private CacheItemPriority _priority;
+        private CacheEntryRemovedCallback _removedCallback;
+        private CacheEntryUpdateCallback _updateCallback;
+
+        public DateTimeOffset AbsoluteExpiration { 
+            get { return _absExpiry; } 
+            set { _absExpiry = value; } 
+        }
+
+        public Collection<ChangeMonitor> ChangeMonitors {
+            get { 
+                if (_changeMonitors == null) {
+                    _changeMonitors = new Collection<ChangeMonitor>();
+                }
+                return _changeMonitors;
+            } 
+        }
+
+        public CacheItemPriority Priority { 
+            get { return _priority; } 
+            set { _priority = value; } 
+        }
+
+        public CacheEntryRemovedCallback RemovedCallback {
+            get { return _removedCallback; }            
+            set { _removedCallback = value; }
+        }
+
+        public TimeSpan SlidingExpiration { 
+            get { return _sldExpiry; } 
+            set { _sldExpiry = value; } 
+        }
+
+        public CacheEntryUpdateCallback UpdateCallback {
+            get { return _updateCallback; }
+            set { _updateCallback = value; }
+        }
+
+        public CacheItemPolicy() {
+            _absExpiry = ObjectCache.InfiniteAbsoluteExpiration;
+            _sldExpiry = ObjectCache.NoSlidingExpiration;
+            _priority = CacheItemPriority.Default;
+        }
+    }
+}