Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame^] | 1 | package org.onosproject.store.consistent.impl; |
| 2 | |
| 3 | import java.util.Arrays; |
| 4 | import java.util.Collection; |
| 5 | import java.util.HashMap; |
| 6 | import java.util.List; |
| 7 | import java.util.Map; |
| 8 | import java.util.Map.Entry; |
| 9 | import java.util.Set; |
| 10 | |
| 11 | import net.kuujo.copycat.state.Initializer; |
| 12 | import net.kuujo.copycat.state.StateContext; |
| 13 | |
| 14 | /** |
| 15 | * Default database state. |
| 16 | * |
| 17 | * @param <K> key type |
| 18 | * @param <V> value type |
| 19 | */ |
| 20 | public class DefaultDatabaseState<K, V> implements DatabaseState<K, V> { |
| 21 | |
| 22 | private Long nextVersion; |
| 23 | private Map<String, Map<K, Versioned<V>>> tables; |
| 24 | |
| 25 | @Initializer |
| 26 | @Override |
| 27 | public void init(StateContext<DatabaseState<K, V>> context) { |
| 28 | tables = context.get("tables"); |
| 29 | if (tables == null) { |
| 30 | tables = new HashMap<>(); |
| 31 | context.put("tables", tables); |
| 32 | } |
| 33 | nextVersion = context.get("nextVersion"); |
| 34 | if (nextVersion == null) { |
| 35 | nextVersion = new Long(0); |
| 36 | context.put("nextVersion", nextVersion); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | private Map<K, Versioned<V>> getTableMap(String tableName) { |
| 41 | Map<K, Versioned<V>> table = tables.get(tableName); |
| 42 | if (table == null) { |
| 43 | table = new HashMap<>(); |
| 44 | tables.put(tableName, table); |
| 45 | } |
| 46 | return table; |
| 47 | } |
| 48 | |
| 49 | @Override |
| 50 | public int size(String tableName) { |
| 51 | return getTableMap(tableName).size(); |
| 52 | } |
| 53 | |
| 54 | @Override |
| 55 | public boolean isEmpty(String tableName) { |
| 56 | return getTableMap(tableName).isEmpty(); |
| 57 | } |
| 58 | |
| 59 | @Override |
| 60 | public boolean containsKey(String tableName, K key) { |
| 61 | return getTableMap(tableName).containsKey(key); |
| 62 | } |
| 63 | |
| 64 | @Override |
| 65 | public boolean containsValue(String tableName, V value) { |
| 66 | return getTableMap(tableName).values().stream().anyMatch(v -> checkEquality(v.value(), value)); |
| 67 | } |
| 68 | |
| 69 | @Override |
| 70 | public Versioned<V> get(String tableName, K key) { |
| 71 | return getTableMap(tableName).get(key); |
| 72 | } |
| 73 | |
| 74 | @Override |
| 75 | public Versioned<V> put(String tableName, K key, V value) { |
| 76 | return getTableMap(tableName).put(key, new Versioned<>(value, ++nextVersion)); |
| 77 | } |
| 78 | |
| 79 | @Override |
| 80 | public Versioned<V> remove(String tableName, K key) { |
| 81 | return getTableMap(tableName).remove(key); |
| 82 | } |
| 83 | |
| 84 | @Override |
| 85 | public void clear(String tableName) { |
| 86 | getTableMap(tableName).clear(); |
| 87 | } |
| 88 | |
| 89 | @Override |
| 90 | public Set<K> keySet(String tableName) { |
| 91 | return getTableMap(tableName).keySet(); |
| 92 | } |
| 93 | |
| 94 | @Override |
| 95 | public Collection<Versioned<V>> values(String tableName) { |
| 96 | return getTableMap(tableName).values(); |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public Set<Entry<K, Versioned<V>>> entrySet(String tableName) { |
| 101 | return getTableMap(tableName).entrySet(); |
| 102 | } |
| 103 | |
| 104 | @Override |
| 105 | public Versioned<V> putIfAbsent(String tableName, K key, V value) { |
| 106 | Versioned<V> existingValue = getTableMap(tableName).get(key); |
| 107 | return existingValue != null ? existingValue : put(tableName, key, value); |
| 108 | } |
| 109 | |
| 110 | @Override |
| 111 | public boolean remove(String tableName, K key, V value) { |
| 112 | Versioned<V> existing = getTableMap(tableName).get(key); |
| 113 | if (existing != null && existing.value().equals(value)) { |
| 114 | getTableMap(tableName).remove(key); |
| 115 | return true; |
| 116 | } |
| 117 | return false; |
| 118 | } |
| 119 | |
| 120 | @Override |
| 121 | public boolean remove(String tableName, K key, long version) { |
| 122 | Versioned<V> existing = getTableMap(tableName).get(key); |
| 123 | if (existing != null && existing.version() == version) { |
| 124 | remove(tableName, key); |
| 125 | return true; |
| 126 | } |
| 127 | return false; |
| 128 | } |
| 129 | |
| 130 | @Override |
| 131 | public boolean replace(String tableName, K key, V oldValue, V newValue) { |
| 132 | Versioned<V> existing = getTableMap(tableName).get(key); |
| 133 | if (existing != null && existing.value().equals(oldValue)) { |
| 134 | put(tableName, key, newValue); |
| 135 | return true; |
| 136 | } |
| 137 | return false; |
| 138 | } |
| 139 | |
| 140 | @Override |
| 141 | public boolean replace(String tableName, K key, long oldVersion, V newValue) { |
| 142 | Versioned<V> existing = getTableMap(tableName).get(key); |
| 143 | if (existing != null && existing.version() == oldVersion) { |
| 144 | put(tableName, key, newValue); |
| 145 | return true; |
| 146 | } |
| 147 | return false; |
| 148 | } |
| 149 | |
| 150 | @Override |
| 151 | public boolean batchUpdate(List<UpdateOperation<K, V>> updates) { |
| 152 | if (updates.stream().anyMatch(update -> !checkIfUpdateIsPossible(update))) { |
| 153 | return false; |
| 154 | } else { |
| 155 | updates.stream().forEach(this::doUpdate); |
| 156 | return true; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | private void doUpdate(UpdateOperation<K, V> update) { |
| 161 | String tableName = update.tableName(); |
| 162 | K key = update.key(); |
| 163 | switch (update.type()) { |
| 164 | case PUT: |
| 165 | put(tableName, key, update.value()); |
| 166 | return; |
| 167 | case REMOVE: |
| 168 | remove(tableName, key); |
| 169 | return; |
| 170 | case PUT_IF_ABSENT: |
| 171 | putIfAbsent(tableName, key, update.value()); |
| 172 | return; |
| 173 | case PUT_IF_VERSION_MATCH: |
| 174 | replace(tableName, key, update.currentValue(), update.value()); |
| 175 | return; |
| 176 | case PUT_IF_VALUE_MATCH: |
| 177 | replace(tableName, key, update.currentVersion(), update.value()); |
| 178 | return; |
| 179 | case REMOVE_IF_VERSION_MATCH: |
| 180 | remove(tableName, key, update.currentVersion()); |
| 181 | return; |
| 182 | case REMOVE_IF_VALUE_MATCH: |
| 183 | remove(tableName, key, update.currentValue()); |
| 184 | return; |
| 185 | default: |
| 186 | throw new IllegalStateException("Unsupported type: " + update.type()); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | private boolean checkIfUpdateIsPossible(UpdateOperation<K, V> update) { |
| 191 | Versioned<V> existingEntry = get(update.tableName(), update.key()); |
| 192 | switch (update.type()) { |
| 193 | case PUT: |
| 194 | case REMOVE: |
| 195 | return true; |
| 196 | case PUT_IF_ABSENT: |
| 197 | return existingEntry == null; |
| 198 | case PUT_IF_VERSION_MATCH: |
| 199 | return existingEntry != null && existingEntry.version() == update.currentVersion(); |
| 200 | case PUT_IF_VALUE_MATCH: |
| 201 | return existingEntry != null && existingEntry.value().equals(update.currentValue()); |
| 202 | case REMOVE_IF_VERSION_MATCH: |
| 203 | return existingEntry == null || existingEntry.version() == update.currentVersion(); |
| 204 | case REMOVE_IF_VALUE_MATCH: |
| 205 | return existingEntry == null || existingEntry.value().equals(update.currentValue()); |
| 206 | default: |
| 207 | throw new IllegalStateException("Unsupported type: " + update.type()); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | private boolean checkEquality(V value1, V value2) { |
| 212 | if (value1 instanceof byte[]) { |
| 213 | return Arrays.equals((byte[]) value1, (byte[]) value2); |
| 214 | } |
| 215 | return value1.equals(value2); |
| 216 | } |
| 217 | } |