Spring数据Neo4J和GraphAware时间树

Question

有没有人使用Java API使用GraphAware TimeTree处理Spring数据Neo4J，并能提供一个简单的示例？

Answer 1

这是我的第一个存储库类。看起来很有效，但迈克尔或卢安（或其他人）可能会在这方面有显著的改进。我还没有包括对某个范围内事件的查询，但它们即将出现。

关于此处内容的几个注释：

timeType参数是域节点和时间树之间关系的名称。

package myproject.core.repository.timeline;

import org.springframework.data.neo4j.annotation.Query;
import org.springframework.data.neo4j.repository.Neo4jRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

import myproject.BaseNode;

@Repository
public interface TimelineRepository extends Neo4jRepository<BaseNode> {

// Attaches a node to the time tree
    @Query("match (e:Event {domainId: {domainId}}) with e call ga.timetree.events.attach({node: e, time: {timestamp}, resolution: 'MILLISECOND', relationshipType: {timeType}}) yield node return node;")
    public void setTime(@Param("domainId") String domainId, @Param("timeType") String typeType, @Param("timestamp") Long timestamp);

// Detaches a node from the timetree
    @Query("match (e:Event {domainId: {domainId}})-[s]-() where type(s) = {timeType} delete s;")
    public void unsetTime(@Param("domainId") String domainId, @Param("timeType") String timeType);
}

下面是我在neo4j中的配置。形态。我正在使用neo4j 3.0.6。我在这里写的几乎都是直接从https://github.com/graphaware/neo4j-timetree.

#For the framework to work at all, you need this
dbms.unmanaged_extension_classes=com.graphaware.server=/graphaware

# Runtime must be enabled like this
com.graphaware.runtime.enabled=true

# A Runtime module that takes care of attaching the events like this (TT is the ID of the module)
com.graphaware.module.TT.1=com.graphaware.module.timetree.module.TimeTreeModuleBootstrapper

# autoAttach must be set to true
com.graphaware.module.TT.autoAttach=true

#Uncommenting this prevents properties of our Event class from persisting
# Optionally, nodes which represent events and should be attached automatically have to be defined (defaults to nodes with label Event)
#com.graphaware.module.TT.event=hasLabel('Message')

# Optionally, a property on the event nodes that represents the the time (long) at which the event took place must be specified (defaults to "timestamp")
#com.graphaware.module.TT.timestamp=time

# Optionally, a property on the event nodes that represents the node ID (long) of the root node for the tree, to which the event should be attached (defaults to "timeTreeRootId")
#com.graphaware.module.TT.customTimeTreeRootProperty=rootId

# Optionally, a resolution can be specified (defaults to DAY)
#com.graphaware.module.TT.resolution=MILLISECOND

# Optionally, a time zone can be specified (defaults to UTC)
#com.graphaware.module.TT.timezone=GMT+1

# Optionally, a relationship type with which the events will be attached to the tree can be specified (defaults to AT_TIME)
#com.graphaware.module.TT.relationship=SENT_ON

# Optionally, a relationship direction (from the tree's point of view), with which the events will be attached to the tree can be specified (defaults to INCOMING)
#com.graphaware.module.TT.direction=INCOMING

您应该能够创建一些看起来有点像这样的东西（以最简单的形式）。。

Answer 2

GraphAware扩展是服务器端代码，Spring数据Neo4j是客户端代码。记住这一点，您可以按照此处和此处相同的行注释使用SDN（假设为v4）的Java类，以便使映射与时间树结构匹配。

也就是说，SDN（v4）还没有对非托管扩展和事务事件处理程序的任何显式支持（GraphAware框架同时支持这两个），所以您需要自己来处理。例如，如果使用时间树自动附加功能并从SDN中持久化事件，则需要重新加载它才能获取时间树节点。