更新: 2018-04-21
GraphAware 的UUID自动生成方式在结合Spring Data Neo4j使用的情况下, 当通过Neo4jRepository.save()创建节点的时候, 无法返回节点的UUID. 因为其UUID是作为事务回调(异步)中生成的, 无法同步返回.该方式已经被Spring Data Neo4j 5.0的ID生成策略(UuidStrategy)替代.
import lombok.Getter;
import lombok.NonNull;
import lombok.Setter;
import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.typeconversion.Convert;
import org.neo4j.ogm.id.UuidStrategy;
import org.neo4j.ogm.typeconversion.UuidStringConverter;
import java.util.UUID;
@NodeEntity
@Getter
@Setter
public class User {
@Id
@GeneratedValue(strategy = UuidStrategy.class)
@Convert(UuidStringConverter.class)
@NonNull
private UUID id;
}我们知道Neo4j的内部ID是会重用的, 因此无法使用其作为业务对象的唯一标识. 因此我们在这里给对象自动添加"uuid"属性作为唯一标识.
独立服务器
需要 GraphAware Neo4j Framework 和 GraphAware Neo4j UUID 两个jar包, 下载地址:
下载页面
https://graphaware.com/produc...
框架库
http://products.graphaware.co...
UUID库
http://products.graphaware.co...
保证graphaware-server-community-all-3.3.2.51.jar和graphaware-uuid-3.3.2.51.14.jar两个库存在于 Neo4j 安装目录的plugins子目录之下. 并重启 Neo4j 服务器.
在conf/neo4j.conf配置文件中添加如下设置:
com.graphaware.runtime.enabled=true
#UIDM becomes the module ID:
com.graphaware.module.UIDM.1=com.graphaware.module.uuid.UuidBootstrapper
#optional, default is uuid:
com.graphaware.module.UIDM.uuidProperty=uuid
#optional, default is false:
com.graphaware.module.UIDM.stripHyphens=false
#optional, default is all nodes:
#com.graphaware.module.UIDM.node=hasLabel('Label1') || hasLabel('Label2')
#optional, default is no relationships:
#com.graphaware.module.UIDM.relationship=isType('Type1')
#com.graphaware.module.UIDM.relationship=com.graphaware.runtime.policy.all.IncludeAllBusinessRelationships
#optional, default is uuidIndex
com.graphaware.module.UIDM.uuidIndex=uuidIndex
#optional, default is uuidRelIndex
com.graphaware.module.UIDM.uuidRelationshipIndex=uuidRelIndex配置
修改配置文件
复制插件到plugins目录
嵌入模式
添加Maven依赖
com.graphaware.neo4j
runtime
LATEST
com.graphaware.neo4j
uuid
3.3.2.51.14
然后在程序中如下使用
创建配置文件
dbms.logs.debug.level=DEBUG
com.graphaware.runtime.enabled=true
com.graphaware.module.UIDM.1=com.graphaware.module.uuid.UuidBootstrapper
com.graphaware.module.UIDM.uuidProperty=uuid
com.graphaware.module.UIDM.stripHyphens=false
com.graphaware.module.UIDM.uuidIndex=uuidIndex
com.graphaware.module.UIDM.uuidRelationshipIndex=uuidRelIndex
public void init() throws Exception {}
graphDb = new GraphDatabaseFactory()
.newEmbeddedDatabaseBuilder(DATABASE_DIRECTORY)
.setConfig(GraphDatabaseSettings.pagecache_memory, "512M")
.setConfig(GraphDatabaseSettings.string_block_size, "60")
.setConfig(GraphDatabaseSettings.array_block_size, "300")
.setConfig(GraphDatabaseSettings.store_internal_log_level, "DEBUG")
.loadPropertiesFromFile(path.toAbsolutePath().toString())
.setConfig(bolt.enabled, "true")
.setConfig(bolt.type, "BOLT")
.setConfig(bolt.listen_address, "0.0.0.0:7687")
.setConfig(bolt.encryption_level, BoltConnector.EncryptionLevel.OPTIONAL.toString())
.setConfig(ShellSettings.remote_shell_enabled, Settings.TRUE)
.newGraphDatabase();
registerFunction(graphDb, ga.uuid.NodeUuidFunctions.class);
registerFunction(graphDb, ga.uuid.RelationshipUuidFunctions.class);
Util.registerShutdownHook(graphDb);
GraphAwareRuntime runtime = GraphAwareRuntimeFactory.createRuntime(database); // database 是一个 GraphDatabaseService 实例
UuidModule module = new UuidModule("UUIDM", UuidConfiguration.defaultConfiguration());
runtime.registerModule(module);
runtime.start();
}
/**
* 注册用户定义函数
*
* @param db
* @param procedures
* @throws KernelException
*/
public static void registerFunction(GraphDatabaseService db, Class... procedures) throws KernelException {
Procedures proceduresService = ((GraphDatabaseAPI) db).getDependencyResolver().resolveDependency(Procedures.class);
for (Class procedure : procedures) {
log.info("=== register function: {}", procedure.toString());
proceduresService.registerFunction(procedure);
}
}参考资料
- https://github.com/graphaware...