--- /dev/null 2013-05-22 15:46:45.000000000 -0700 +++ new/test/java/util/Map/TreeBinSplitBackToEntries.java 2013-05-22 15:46:45.000000000 -0700 @@ -0,0 +1,255 @@ +/* + * Copyright (c) 2013, 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. + */ + +import java.util.*; +import java.lang.reflect.Field; + +/* + * @test + * @bug 8005698 + * @summary Test the case where TreeBin.splitTreeBin() converts a bin back to an Entry list + * @run main TreeBinSplitBackToEntries unused + * @author Brent Christian + */ + +public class TreeBinSplitBackToEntries { + private static int EXPECTED_TREE_THRESHOLD = 16; + + // Easiest if this covers one bit higher then 'bit' in splitTreeBin() on the + // call where the TreeBin is converted back to an Entry list + private static int HASHMASK = 0x7F; + private static boolean verbose = false; + private static boolean fastFail = false; + private static boolean failed = false; + + static void printlnIfVerbose(String msg) { + if (verbose) {System.out.println(msg); } + } + + public static void main(String[] args) { + for (String arg : args) { + switch(arg) { + case "-verbose": + verbose = true; + break; + case "-fastfail": + fastFail = true; + break; + } + } + checkTreeThreshold(); + testMapHiTree(); + testMapLoTree(); + if (failed) { + System.out.println("Test Failed"); + System.exit(1); + } else { + System.out.println("Test Passed"); + } + } + + public static void checkTreeThreshold() { + int threshold = -1; + try { + Class treeBinClass = Class.forName("java.util.TreeBin"); + Field treeThreshold = treeBinClass.getDeclaredField("TREE_THRESHOLD"); + treeThreshold.setAccessible(true); + threshold = treeThreshold.getInt(treeBinClass); + } catch (ClassNotFoundException|NoSuchFieldException|IllegalAccessException e) { + e.printStackTrace(); + throw new Error("Problem accessing TreeBin.TREE_THRESHOLD", e); + } + check("Expected TREE_THRESHOLD: " + EXPECTED_TREE_THRESHOLD +", found: " + threshold, + threshold == EXPECTED_TREE_THRESHOLD); + printlnIfVerbose("TREE_THRESHOLD: " + threshold); + } + + public static void testMapHiTree() { + Object[][] mapKeys = makeHiTreeTestData(); + testMapsForKeys(mapKeys, "hiTree"); + } + + public static void testMapLoTree() { + Object[][] mapKeys = makeLoTreeTestData(); + + testMapsForKeys(mapKeys, "loTree"); + } + + public static void testMapsForKeys(Object[][] mapKeys, String desc) { + // loop through data sets + for (Object[] keys_desc : mapKeys) { + Map[] maps = (Map[]) new Map[]{ + new HashMap<>(4, 0.8f), + new LinkedHashMap<>(4, 0.8f), + }; + // for each map type. + for (Map map : maps) { + Object[] keys = (Object[]) keys_desc[1]; + System.out.println(desc + ": testPutThenGet() for " + map.getClass()); + testPutThenGet(map, keys); + } + } + } + + private static void testPutThenGet(Map map, T[] keys) { + for (T key : keys) { + printlnIfVerbose("put()ing 0x" + Integer.toHexString(Integer.parseInt(key.toString())) + ", hashCode=" + Integer.toHexString(key.hashCode())); + map.put(key, key); + } + for (T key : keys) { + check("key: 0x" + Integer.toHexString(Integer.parseInt(key.toString())) + " not found in resulting " + map.getClass().getSimpleName(), map.get(key) != null); + } + } + + /* Data to force a non-empty loTree in TreeBin.splitTreeBin() to be converted back + * into an Entry list + */ + private static Object[][] makeLoTreeTestData() { + HashableInteger COLLIDING_OBJECTS[] = new HashableInteger[] { + new HashableInteger( 0x23, HASHMASK), + new HashableInteger( 0x123, HASHMASK), + new HashableInteger( 0x323, HASHMASK), + new HashableInteger( 0x523, HASHMASK), + + new HashableInteger( 0x723, HASHMASK), + new HashableInteger( 0x923, HASHMASK), + new HashableInteger( 0xB23, HASHMASK), + new HashableInteger( 0xD23, HASHMASK), + + new HashableInteger( 0xF23, HASHMASK), + new HashableInteger( 0xF123, HASHMASK), + new HashableInteger( 0x1023, HASHMASK), + new HashableInteger( 0x1123, HASHMASK), + + new HashableInteger( 0x1323, HASHMASK), + new HashableInteger( 0x1523, HASHMASK), + new HashableInteger( 0x1723, HASHMASK), + new HashableInteger( 0x1923, HASHMASK), + + new HashableInteger( 0x1B23, HASHMASK), + new HashableInteger( 0x1D23, HASHMASK), + new HashableInteger( 0x3123, HASHMASK), + new HashableInteger( 0x3323, HASHMASK), + new HashableInteger( 0x3523, HASHMASK), + + new HashableInteger( 0x3723, HASHMASK), + new HashableInteger( 0x1001, HASHMASK), + new HashableInteger( 0x4001, HASHMASK), + new HashableInteger( 0x1, HASHMASK), + }; + return new Object[][] { + new Object[]{"Colliding Objects", COLLIDING_OBJECTS}, + }; + } + + /* Data to force the hiTree in TreeBin.splitTreeBin() to be converted back + * into an Entry list + */ + private static Object[][] makeHiTreeTestData() { + HashableInteger COLLIDING_OBJECTS[] = new HashableInteger[] { + new HashableInteger( 0x1, HASHMASK), + new HashableInteger( 0x101, HASHMASK), + new HashableInteger( 0x301, HASHMASK), + new HashableInteger( 0x501, HASHMASK), + new HashableInteger( 0x701, HASHMASK), + + new HashableInteger( 0x1001, HASHMASK), + new HashableInteger( 0x1101, HASHMASK), + new HashableInteger( 0x1301, HASHMASK), + + new HashableInteger( 0x1501, HASHMASK), + new HashableInteger( 0x1701, HASHMASK), + new HashableInteger( 0x4001, HASHMASK), + new HashableInteger( 0x4101, HASHMASK), + new HashableInteger( 0x4301, HASHMASK), + + new HashableInteger( 0x4501, HASHMASK), + new HashableInteger( 0x4701, HASHMASK), + new HashableInteger( 0x8001, HASHMASK), + new HashableInteger( 0x8101, HASHMASK), + + + new HashableInteger( 0x8301, HASHMASK), + new HashableInteger( 0x8501, HASHMASK), + new HashableInteger( 0x8701, HASHMASK), + new HashableInteger( 0x9001, HASHMASK), + + new HashableInteger( 0x23, HASHMASK), + new HashableInteger( 0x123, HASHMASK), + new HashableInteger( 0x323, HASHMASK), + new HashableInteger( 0x523, HASHMASK), + }; + return new Object[][] { + new Object[]{"Colliding Objects", COLLIDING_OBJECTS}, + }; + } + + static void check(String desc, boolean cond) { + if (!cond) { + fail(desc); + } + } + + static void fail(String msg) { + failed = true; + (new Error("Failure: " + msg)).printStackTrace(System.err); + if (fastFail) { + System.exit(1); + } + } + + final static class HashableInteger implements Comparable { + final int value; + final int hashmask; //yes duplication + + HashableInteger(int value, int hashmask) { + this.value = value; + this.hashmask = hashmask; + } + + @Override + public boolean equals(Object obj) { + if (obj instanceof HashableInteger) { + HashableInteger other = (HashableInteger) obj; + return other.value == value; + } + return false; + } + + @Override + public int hashCode() { + // This version ANDs the mask + return value & hashmask; + } + + @Override + public int compareTo(HashableInteger o) { + return value - o.value; + } + + @Override + public String toString() { + return Integer.toString(value); + } + } +}