Titan Graph DataBase 研究 (三)----Java API使用上

2019-11-09 13:31:12

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上一篇说道了如何TitanServer的发布,那么这一章就来说说如何用javaApI操作Titan,话不多说直接上代码 pom.xml

<PRoject xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.run.tatin</groupId> <artifactId>tatindemo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>tatindemo</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <titan.version>1.0.0</titan.version> </properties> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.0</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>jdk.tools</groupId> <artifactId>jdk.tools</artifactId> <version>1.8</version> <scope>system</scope> <systemPath>${JAVA_HOME}/lib/tools.jar</systemPath> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency>  <dependency> <groupId>com.thinkaurelius.titan</groupId> <artifactId>titan-core</artifactId> <version>1.0.0</version> <exclusions> <exclusion> <artifactId>guava</artifactId> <groupId>com.google.guava</groupId> </exclusion> </exclusions> </dependency>  <dependency> <groupId>com.thinkaurelius.titan</groupId> <artifactId>titan-solr</artifactId> <version>${titan.version}</version> <exclusions> <exclusion> <artifactId>guava</artifactId> <groupId>com.google.guava</groupId> </exclusion> </exclusions> </dependency>  <dependency> <groupId>com.thinkaurelius.titan</groupId> <artifactId>titan-hbase</artifactId> <version>${titan.version}</version> </dependency>  <dependency> <groupId>org.apache.tinkerpop</groupId> <artifactId>gremlin-driver</artifactId> <version>3.0.1-incubating</version> </dependency>  <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-client</artifactId> <version>1.0.0-cdh5.4.8</version> <exclusions> <exclusion> <artifactId>guava</artifactId> <groupId>com.google.guava</groupId> </exclusion> </exclusions> </dependency>  <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>12.0.1</version> </dependency> </dependencies>  <repositories> <repository> <id>central</id> <url>http://repo1.maven.org/maven2</url> <releases> <enabled>true</enabled> </releases> </repository> <repository> <id>cloudera cdh</id> <url>https://repository.cloudera.com/artifactory/cloudera-repos</url> <releases> <enabled>true</enabled> </releases> <snapshots> <enabled>false</enabled> </snapshots> </repository> <repository> <id>apache snapshots</id> <url>https://repository.apache.org/content/groups/public/</url> <snapshots> <enabled>true</enabled> </snapshots> <releases> <enabled>true</enabled> </releases> </repository> <repository> <id>sonatypereleases</id> <url>https://oss.sonatype.org/content/groups/public/</url> <snapshots> <enabled>true</enabled> </snapshots> <releases> <enabled>true</enabled> </releases> </repository> </repositories></project>

TestTian.java

public class TestTitan { public static final String INDEX_NAME = "search"; public static void main(String[] args) { TitanFactory.Builder config = TitanFactory.build(); config.set("storage.backend", "hbase"); config.set("storage.hostname", "hadoop1,hadoop2,hadoop3,hadoop4,hadoop5"); config.set("cache.db-cache", "true"); config.set("cache.db-cache-clean-wait", "20"); config.set("cache.db-cache-time", "180000"); config.set("cache.db-cache-size", "0.5"); config.set("index.search.backend", "solr"); config.set("index.search.solr.mode", "cloud"); config.set("index.search.solr.zookeeper-url", "solr1:2181,solr2:2181,solr3:2181,solr4:2181,solr5:2181"); config.set("index.search.solr.configset", "titan"); TitanGraph graph = config.open(); System.out.println("--------------------" + graph); }}

上面就是获取Titan图实例的代码,具体如何创建顶点、边的代码,笔者还在研究。

在研究过程中遇到的问题一、

Exception in thread "main" java.lang.NoSuchMethodError: com.google.common.base.Stopwatch.elapsedTime(Ljava/util/concurrent/TimeUnit;)J at com.google.common.cache.LocalCache$LoadingValueReference.elapsedNanos(LocalCache.java:3600) at com.google.common.cache.LocalCache$Segment.getAndRecordStats(LocalCache.java:2412) at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2373) at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2335) at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2250) at com.google.common.cache.LocalCache.get(LocalCache.java:3985) at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4788) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx$6$6.call(StandardTitanTx.java:1244) at com.thinkaurelius.titan.graphdb.query.QueryUtil.processIntersectingRetrievals(QueryUtil.java:268) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx$6.execute(StandardTitanTx.java:1258) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx$6.execute(StandardTitanTx.java:1126) at com.thinkaurelius.titan.graphdb.query.QueryProcessor$LimitAdjustingIterator.getNewIterator(QueryProcessor.java:198) at com.thinkaurelius.titan.graphdb.query.LimitAdjustingIterator.hasNext(LimitAdjustingIterator.java:54) at com.thinkaurelius.titan.graphdb.query.ResultSetIterator.nextInternal(ResultSetIterator.java:40) at com.thinkaurelius.titan.graphdb.query.ResultSetIterator.<init>(ResultSetIterator.java:30) at com.thinkaurelius.titan.graphdb.query.QueryProcessor.iterator(QueryProcessor.java:57) at com.google.common.collect.Iterables$7.iterator(Iterables.java:613) at com.google.common.collect.Iterables.isEmpty(Iterables.java:1054) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.addProperty(StandardTitanTx.java:779) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.addProperty(StandardTitanTx.java:706) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.makeSchemaVertex(StandardTitanTx.java:836) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.makePropertyKey(StandardTitanTx.java:856) at com.thinkaurelius.titan.graphdb.types.StandardPropertyKeyMaker.make(StandardPropertyKeyMaker.java:86) at com.run.tatin.tatindemo.TestTitan.load(TestTitan.java:50) at com.run.tatin.tatindemo.TestTitan.load(TestTitan.java:43) at com.run.tatin.tatindemo.TestTitan.main(TestTitan.java:35)

如发生上面异常是因为titan-hbase-1.0.0.jar中将guava的StopWatch类重新进行了改造并且缺少了elapsedTime这个方法,但是又因为guava12.0.1本身StopWatch类中又缺少titan-hbase包中的一些成员方法.最终解决方案是将titan-hbase-core重新修改并且打包打包后的jar在请到下面下载

http://download.csdn.net/detail/q2365921/9750637

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