1/* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24package gc.g1.humongousObjects.objectGraphTest; 25 26import java.lang.ref.Reference; 27 28/** 29 * Immutable structure that holds the following information about graph's node 30 * reference - weak/soft reference to graph's node 31 * graphId and nodeId - graph's and node's ids - we need this for error handling 32 * softlyReachable - is node effectively referenced by external soft reference. It could be when external 33 * soft reference or when this node is reachable from node that externally referenced by soft reference 34 * effectiveHumongous - if node behaves effectively humongous. It could be when node is humongous 35 * or when this node is reachable from humongous node. 36 * 37 * @param <T> - actual type of node 38 */ 39public class ReferenceInfo<T> { 40 public final Reference<T> reference; 41 public final String graphId; 42 public final String nodeId; 43 public final boolean softlyReachable; 44 public final boolean effectiveHumongous; 45 46 public ReferenceInfo(Reference<T> reference, String graphId, String nodeId, boolean softlyReachable, 47 boolean effectiveHumongous) { 48 this.reference = reference; 49 this.graphId = graphId; 50 this.nodeId = nodeId; 51 this.softlyReachable = softlyReachable; 52 this.effectiveHumongous = effectiveHumongous; 53 } 54 55 @Override 56 public String toString() { 57 return String.format("Node %s is effectively %shumongous and effectively %ssoft referenced\n" 58 + "\tReference type is %s and it points to %s", nodeId, 59 (effectiveHumongous ? "" : "non-"), (softlyReachable ? "" : "non-"), 60 reference.getClass().getSimpleName(), reference.get()); 61 } 62} 63