| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with this |
| * work for additional information regarding copyright ownership. The ASF |
| * licenses this file to You under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.hugegraph.backend.cache; |
| |
| import java.util.Iterator; |
| |
| import org.apache.hugegraph.backend.query.Query; |
| import org.apache.hugegraph.backend.id.Id; |
| import org.apache.hugegraph.backend.store.BackendEntry; |
| import org.apache.hugegraph.backend.store.BackendFeatures; |
| import org.apache.hugegraph.backend.store.BackendMutation; |
| import org.apache.hugegraph.backend.store.BackendStore; |
| import org.apache.hugegraph.backend.store.BackendStoreProvider; |
| import org.apache.hugegraph.backend.store.SystemSchemaStore; |
| import org.apache.hugegraph.config.HugeConfig; |
| import org.apache.hugegraph.type.HugeType; |
| import org.apache.hugegraph.util.StringEncoding; |
| |
| /** |
| * This class is unused now, just for debug or test |
| */ |
| public class CachedBackendStore implements BackendStore { |
| |
| private BackendStore store = null; |
| private Cache<Id, Object> cache = null; |
| |
| public CachedBackendStore(BackendStore store) { |
| this.store = store; |
| this.cache = CacheManager.instance().cache("store-" + store()); |
| // Set expire 30s |
| this.cache.expire(30 * 1000L); |
| } |
| |
| @Override |
| public String store() { |
| return this.store.store(); |
| } |
| |
| @Override |
| public String storedVersion() { |
| return this.store.storedVersion(); |
| } |
| |
| @Override |
| public String database() { |
| return this.store.database(); |
| } |
| |
| @Override |
| public BackendStoreProvider provider() { |
| return this.store.provider(); |
| } |
| |
| @Override |
| public SystemSchemaStore systemSchemaStore() { |
| return this.store.systemSchemaStore(); |
| } |
| |
| @Override |
| public void open(HugeConfig config) { |
| this.store.open(config); |
| } |
| |
| @Override |
| public void close() { |
| this.store.close(); |
| } |
| |
| @Override |
| public boolean opened() { |
| return this.store.opened(); |
| } |
| |
| @Override |
| public void init() { |
| this.store.init(); |
| } |
| |
| @Override |
| public void clear(boolean clearSpace) { |
| this.store.clear(clearSpace); |
| } |
| |
| @Override |
| public boolean initialized() { |
| return this.store.initialized(); |
| } |
| |
| @Override |
| public void truncate() { |
| this.store.truncate(); |
| } |
| |
| @Override |
| public void beginTx() { |
| this.store.beginTx(); |
| } |
| |
| @Override |
| public void commitTx() { |
| this.store.commitTx(); |
| } |
| |
| @Override |
| public void rollbackTx() { |
| this.store.rollbackTx(); |
| } |
| |
| @Override |
| public <R> R metadata(HugeType type, String meta, Object[] args) { |
| return this.store.metadata(type, meta, args); |
| } |
| |
| @Override |
| public BackendFeatures features() { |
| return this.store.features(); |
| } |
| |
| @Override |
| public Id nextId(HugeType type) { |
| return this.store.nextId(type); |
| } |
| |
| @Override |
| public void increaseCounter(HugeType type, long increment) { |
| this.store.increaseCounter(type, increment); |
| } |
| |
| @Override |
| public long getCounter(HugeType type) { |
| return this.store.getCounter(type); |
| } |
| |
| @Override |
| public boolean isSchemaStore() { |
| return this.store.isSchemaStore(); |
| } |
| |
| @Override |
| public void mutate(BackendMutation mutation) { |
| // TODO: invalid cache, or set expire time at least |
| this.store.mutate(mutation); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Iterator<BackendEntry> query(Query query) { |
| if (query.empty()) { |
| return this.store.query(query); |
| } |
| |
| QueryId id = new QueryId(query); |
| Object result = this.cache.get(id); |
| if (result != null) { |
| return (Iterator<BackendEntry>) result; |
| } else { |
| Iterator<BackendEntry> rs = this.store.query(query); |
| if (rs.hasNext()) { |
| this.cache.update(id, rs); |
| } |
| return rs; |
| } |
| } |
| |
| @Override |
| public Number queryNumber(Query query) { |
| return this.store.queryNumber(query); |
| } |
| |
| /** |
| * Query as an Id for cache |
| */ |
| static class QueryId implements Id { |
| |
| private String query; |
| private int hashCode; |
| |
| public QueryId(Query q) { |
| this.query = q.toString(); |
| this.hashCode = q.hashCode(); |
| } |
| |
| @Override |
| public IdType type() { |
| return IdType.UNKNOWN; |
| } |
| |
| @Override |
| public int hashCode() { |
| return this.hashCode; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (!(other instanceof QueryId)) { |
| return false; |
| } |
| return this.query.equals(((QueryId) other).query); |
| } |
| |
| @Override |
| public int compareTo(Id o) { |
| return this.query.compareTo(o.asString()); |
| } |
| |
| @Override |
| public Object asObject() { |
| return this.query; |
| } |
| |
| @Override |
| public String asString() { |
| return this.query; |
| } |
| |
| @Override |
| public long asLong() { |
| // TODO: improve |
| return 0L; |
| } |
| |
| @Override |
| public byte[] asBytes() { |
| return StringEncoding.encode(this.query); |
| } |
| |
| @Override |
| public String toString() { |
| return this.query; |
| } |
| |
| @Override |
| public int length() { |
| return this.query.length(); |
| } |
| } |
| } |