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; |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 9 | import java.util.stream.Collectors; |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 10 | import java.util.Set; |
| 11 | |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 12 | import org.apache.commons.lang3.tuple.Pair; |
| 13 | import org.onosproject.store.service.UpdateOperation; |
| 14 | import org.onosproject.store.service.Versioned; |
| 15 | |
| 16 | import com.google.common.collect.ImmutableList; |
| 17 | import com.google.common.collect.ImmutableSet; |
| 18 | |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 19 | import net.kuujo.copycat.state.Initializer; |
| 20 | import net.kuujo.copycat.state.StateContext; |
| 21 | |
| 22 | /** |
| 23 | * Default database state. |
| 24 | * |
| 25 | * @param <K> key type |
| 26 | * @param <V> value type |
| 27 | */ |
| 28 | public class DefaultDatabaseState<K, V> implements DatabaseState<K, V> { |
| 29 | |
| 30 | private Long nextVersion; |
| 31 | private Map<String, Map<K, Versioned<V>>> tables; |
| 32 | |
| 33 | @Initializer |
| 34 | @Override |
| 35 | public void init(StateContext<DatabaseState<K, V>> context) { |
| 36 | tables = context.get("tables"); |
| 37 | if (tables == null) { |
| 38 | tables = new HashMap<>(); |
| 39 | context.put("tables", tables); |
| 40 | } |
| 41 | nextVersion = context.get("nextVersion"); |
| 42 | if (nextVersion == null) { |
| 43 | nextVersion = new Long(0); |
| 44 | context.put("nextVersion", nextVersion); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | private Map<K, Versioned<V>> getTableMap(String tableName) { |
| 49 | Map<K, Versioned<V>> table = tables.get(tableName); |
| 50 | if (table == null) { |
| 51 | table = new HashMap<>(); |
| 52 | tables.put(tableName, table); |
| 53 | } |
| 54 | return table; |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public int size(String tableName) { |
| 59 | return getTableMap(tableName).size(); |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public boolean isEmpty(String tableName) { |
| 64 | return getTableMap(tableName).isEmpty(); |
| 65 | } |
| 66 | |
| 67 | @Override |
| 68 | public boolean containsKey(String tableName, K key) { |
| 69 | return getTableMap(tableName).containsKey(key); |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public boolean containsValue(String tableName, V value) { |
| 74 | return getTableMap(tableName).values().stream().anyMatch(v -> checkEquality(v.value(), value)); |
| 75 | } |
| 76 | |
| 77 | @Override |
| 78 | public Versioned<V> get(String tableName, K key) { |
| 79 | return getTableMap(tableName).get(key); |
| 80 | } |
| 81 | |
| 82 | @Override |
| 83 | public Versioned<V> put(String tableName, K key, V value) { |
| 84 | return getTableMap(tableName).put(key, new Versioned<>(value, ++nextVersion)); |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | public Versioned<V> remove(String tableName, K key) { |
| 89 | return getTableMap(tableName).remove(key); |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | public void clear(String tableName) { |
| 94 | getTableMap(tableName).clear(); |
| 95 | } |
| 96 | |
| 97 | @Override |
| 98 | public Set<K> keySet(String tableName) { |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 99 | return ImmutableSet.copyOf(getTableMap(tableName).keySet()); |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | @Override |
| 103 | public Collection<Versioned<V>> values(String tableName) { |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 104 | return ImmutableList.copyOf(getTableMap(tableName).values()); |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | @Override |
| 108 | public Set<Entry<K, Versioned<V>>> entrySet(String tableName) { |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 109 | return ImmutableSet.copyOf(getTableMap(tableName) |
| 110 | .entrySet() |
| 111 | .stream() |
| 112 | .map(entry -> Pair.of(entry.getKey(), entry.getValue())) |
| 113 | .collect(Collectors.toSet())); |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | @Override |
| 117 | public Versioned<V> putIfAbsent(String tableName, K key, V value) { |
| 118 | Versioned<V> existingValue = getTableMap(tableName).get(key); |
| 119 | return existingValue != null ? existingValue : put(tableName, key, value); |
| 120 | } |
| 121 | |
| 122 | @Override |
| 123 | public boolean remove(String tableName, K key, V value) { |
| 124 | Versioned<V> existing = getTableMap(tableName).get(key); |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 125 | if (existing != null && checkEquality(existing.value(), value)) { |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 126 | getTableMap(tableName).remove(key); |
| 127 | return true; |
| 128 | } |
| 129 | return false; |
| 130 | } |
| 131 | |
| 132 | @Override |
| 133 | public boolean remove(String tableName, K key, long version) { |
| 134 | Versioned<V> existing = getTableMap(tableName).get(key); |
| 135 | if (existing != null && existing.version() == version) { |
| 136 | remove(tableName, key); |
| 137 | return true; |
| 138 | } |
| 139 | return false; |
| 140 | } |
| 141 | |
| 142 | @Override |
| 143 | public boolean replace(String tableName, K key, V oldValue, V newValue) { |
| 144 | Versioned<V> existing = getTableMap(tableName).get(key); |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 145 | if (existing != null && checkEquality(existing.value(), oldValue)) { |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 146 | put(tableName, key, newValue); |
| 147 | return true; |
| 148 | } |
| 149 | return false; |
| 150 | } |
| 151 | |
| 152 | @Override |
| 153 | public boolean replace(String tableName, K key, long oldVersion, V newValue) { |
| 154 | Versioned<V> existing = getTableMap(tableName).get(key); |
| 155 | if (existing != null && existing.version() == oldVersion) { |
| 156 | put(tableName, key, newValue); |
| 157 | return true; |
| 158 | } |
| 159 | return false; |
| 160 | } |
| 161 | |
| 162 | @Override |
| 163 | public boolean batchUpdate(List<UpdateOperation<K, V>> updates) { |
| 164 | if (updates.stream().anyMatch(update -> !checkIfUpdateIsPossible(update))) { |
| 165 | return false; |
| 166 | } else { |
| 167 | updates.stream().forEach(this::doUpdate); |
| 168 | return true; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | private void doUpdate(UpdateOperation<K, V> update) { |
| 173 | String tableName = update.tableName(); |
| 174 | K key = update.key(); |
| 175 | switch (update.type()) { |
| 176 | case PUT: |
| 177 | put(tableName, key, update.value()); |
| 178 | return; |
| 179 | case REMOVE: |
| 180 | remove(tableName, key); |
| 181 | return; |
| 182 | case PUT_IF_ABSENT: |
| 183 | putIfAbsent(tableName, key, update.value()); |
| 184 | return; |
| 185 | case PUT_IF_VERSION_MATCH: |
| 186 | replace(tableName, key, update.currentValue(), update.value()); |
| 187 | return; |
| 188 | case PUT_IF_VALUE_MATCH: |
| 189 | replace(tableName, key, update.currentVersion(), update.value()); |
| 190 | return; |
| 191 | case REMOVE_IF_VERSION_MATCH: |
| 192 | remove(tableName, key, update.currentVersion()); |
| 193 | return; |
| 194 | case REMOVE_IF_VALUE_MATCH: |
| 195 | remove(tableName, key, update.currentValue()); |
| 196 | return; |
| 197 | default: |
| 198 | throw new IllegalStateException("Unsupported type: " + update.type()); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | private boolean checkIfUpdateIsPossible(UpdateOperation<K, V> update) { |
| 203 | Versioned<V> existingEntry = get(update.tableName(), update.key()); |
| 204 | switch (update.type()) { |
| 205 | case PUT: |
| 206 | case REMOVE: |
| 207 | return true; |
| 208 | case PUT_IF_ABSENT: |
| 209 | return existingEntry == null; |
| 210 | case PUT_IF_VERSION_MATCH: |
| 211 | return existingEntry != null && existingEntry.version() == update.currentVersion(); |
| 212 | case PUT_IF_VALUE_MATCH: |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 213 | return existingEntry != null && checkEquality(existingEntry.value(), update.currentValue()); |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 214 | case REMOVE_IF_VERSION_MATCH: |
| 215 | return existingEntry == null || existingEntry.version() == update.currentVersion(); |
| 216 | case REMOVE_IF_VALUE_MATCH: |
Madan Jampani | 393e0f0 | 2015-02-12 07:35:39 +0530 | [diff] [blame^] | 217 | return existingEntry == null || checkEquality(existingEntry.value(), update.currentValue()); |
Madan Jampani | 94c2353 | 2015-02-05 17:40:01 -0800 | [diff] [blame] | 218 | default: |
| 219 | throw new IllegalStateException("Unsupported type: " + update.type()); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | private boolean checkEquality(V value1, V value2) { |
| 224 | if (value1 instanceof byte[]) { |
| 225 | return Arrays.equals((byte[]) value1, (byte[]) value2); |
| 226 | } |
| 227 | return value1.equals(value2); |
| 228 | } |
| 229 | } |