2 * Copyright (c) 2015 Brocade Communications Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.mdsal.eos.common.api;
10 import com.google.common.base.Preconditions;
11 import com.google.common.collect.ImmutableMap;
12 import com.google.common.collect.ImmutableMap.Builder;
16 * Enumerates the ownership change states for an entity.
18 * @author Thomas Pantelis
20 public enum EntityOwnershipChangeState {
22 * The local process instance has been granted ownership.
24 LOCAL_OWNERSHIP_GRANTED(false, true, true),
27 * The local process instance has lost ownership and another process instance is now the owner.
29 LOCAL_OWNERSHIP_LOST_NEW_OWNER(true, false, true),
32 * The local process instance has lost ownership and there are no longer any candidates for the entity and
35 LOCAL_OWNERSHIP_LOST_NO_OWNER(true, false, false),
38 * The local process instance ownership has not changed but some other aspect has changed (for example inJeopardy).
40 LOCAL_OWNERSHIP_RETAINED_WITH_NO_CHANGE(true, true, true),
43 * Entity ownership has transitioned to another process instance and this instance was not the previous owner.
45 REMOTE_OWNERSHIP_CHANGED(false, false, true),
48 * A remote process instance has lost ownership and there are no longer any candidates for the entity and
51 REMOTE_OWNERSHIP_LOST_NO_OWNER(false, false, false);
53 private static final Map<Key, EntityOwnershipChangeState> BY_KEY;
56 final Builder<Key, EntityOwnershipChangeState> builder = ImmutableMap.builder();
57 for (final EntityOwnershipChangeState e: values()) {
58 builder.put(new Key(e.wasOwner, e.isOwner, e.hasOwner), e);
61 BY_KEY = builder.build();
64 private final boolean wasOwner;
65 private final boolean isOwner;
66 private final boolean hasOwner;
68 EntityOwnershipChangeState(final boolean wasOwner, final boolean isOwner, final boolean hasOwner) {
69 this.wasOwner = wasOwner;
70 this.isOwner = isOwner;
71 this.hasOwner = hasOwner;
75 * Returns the previous ownership status of the entity for this process instance.
76 * @return true if this process was the owner of the entity at the time this notification was generated
78 public boolean wasOwner() {
83 * Returns the current ownership status of the entity for this process instance.
84 * @return true if this process is now the owner of the entity
86 public boolean isOwner() {
91 * Returns the current ownership status of the entity across all process instances.
92 * @return true if the entity has an owner which may or may not be this process. If false, then
93 * the entity has no candidates and thus no owner.
95 public boolean hasOwner() {
100 public String toString() {
101 return name() + " [wasOwner=" + wasOwner + ", isOwner=" + isOwner + ", hasOwner=" + hasOwner + "]";
104 public static EntityOwnershipChangeState from(
105 final boolean wasOwner, final boolean isOwner, final boolean hasOwner) {
106 final EntityOwnershipChangeState state = BY_KEY.get(new Key(wasOwner, isOwner, hasOwner));
107 Preconditions.checkArgument(state != null, "Invalid combination of wasOwner: %s, isOwner: %s, hasOwner: %s",
108 wasOwner, isOwner, hasOwner);
112 private static final class Key {
113 private final boolean wasOwner;
114 private final boolean isOwner;
115 private final boolean hasOwner;
117 Key(final boolean wasOwner, final boolean isOwner, final boolean hasOwner) {
118 this.wasOwner = wasOwner;
119 this.isOwner = isOwner;
120 this.hasOwner = hasOwner;
124 public int hashCode() {
125 final int prime = 31;
127 result = prime * result + (hasOwner ? 1231 : 1237);
128 result = prime * result + (isOwner ? 1231 : 1237);
129 result = prime * result + (wasOwner ? 1231 : 1237);
134 public boolean equals(final Object obj) {
138 if (!(obj instanceof Key)) {
141 final Key other = (Key) obj;
142 return hasOwner == other.hasOwner && isOwner == other.isOwner && wasOwner == other.wasOwner;