--- /dev/null	2015-11-11 00:08:33.433730035 +0300
+++ new/test/gc/g1/plab/lib/Storage.java	2015-11-17 19:17:57.080880537 +0300
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package gc.g1.plab.lib;
+
+/**
+ * The Storage is used for storing reachable objects.
+ * Class will store not more than capacity, which can be set during creation.
+ * If we exceed capacity, object will be stored at existing entries.
+ * So, if capacity=1, all previously added objects will be unreachable.
+ */
+public class Storage {
+
+    private int capacity;
+
+    private Object[] array;
+    private int index;
+
+    /**
+     * Create Storage object with defined capacity
+     *
+     * @param capacity
+     */
+    public Storage(int capacity) {
+        if (capacity <= 0) {
+            throw new IllegalArgumentException("Items number should be greater than 0.");
+        }
+        this.capacity = capacity;
+        index = 0;
+        array = new Object[this.capacity];
+    }
+
+    /**
+     * Store object into Storage.
+     *
+     * @param o - Object to store
+     */
+    public void store(Object o) {
+        if (array == null) {
+            throw new RuntimeException("Capacity should be set before storing");
+        }
+        array[index % capacity] = o;
+        ++index;
+    }
+
+    /**
+     * Clear all stored objects.
+     */
+    public void clear() {
+        array = null;
+    }
+}