[英]cassandra 3.x Trigger Example Error
Hey i want to implement this example here but it doesnt work and i dont know how to fix it. 嘿,我想在这里实现这个例子,但它不起作用,我不知道如何解决它。
public class AuditTrigger implements ITrigger
{
private Properties properties = loadProperties();
public Collection<Mutation> augment(Partition update)
{
String auditKeyspace = properties.getProperty("keyspace");
String auditTable = properties.getProperty("table");
RowUpdateBuilder audit = new RowUpdateBuilder(Schema.instance.getCFMetaData(auditKeyspace, auditTable),
FBUtilities.timestampMicros(),
UUIDGen.getTimeUUID());
audit.add("keyspace_name", update.metadata().ksName);
audit.add("table_name", update.metadata().cfName);
audit.add("primary_key", update.metadata().getKeyValidator().getString(update.partitionKey().getKey()));
return Collections.singletonList(audit.build());
}
private static Properties loadProperties()
{
Properties properties = new Properties();
InputStream stream = AuditTrigger.class.getClassLoader().getResourceAsStream("AuditTrigger.properties");
try
{
properties.load(stream);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
finally
{
// FileUtils.closeQuietly(stream);
}
return properties;
}
}
And xml Code: 和xml代码:
<project default="jar" name="trigger-example">
<property name="cassandra.dir" value="../.." />
<property name="cassandra.dir.lib" value="${cassandra.dir}/lib" />
<property name="cassandra.classes" value="${cassandra.dir}/build/classes/main" />
<property name="build.src" value="${basedir}/src" />
<property name="build.dir" value="${basedir}/build" />
<property name="conf.dir" value="${basedir}/conf" />
<property name="build.classes" value="${build.dir}/classes" />
<property name="final.name" value="trigger-example" />
<path id="build.classpath">
<fileset dir="${cassandra.dir.lib}">
<include name="**/*.jar" />
</fileset>
<fileset dir="${cassandra.dir}/build/lib/jars">
<include name="**/*.jar" />
</fileset>
<pathelement location="${cassandra.classes}" />
</path>
<target name="init">
<mkdir dir="${build.classes}" />
</target>
<target name="build" depends="init">
<javac destdir="${build.classes}" debug="true" includeantruntime="false">
<src path="${build.src}" />
<classpath refid="build.classpath" />
</javac>
</target>
<target name="jar" depends="build">
<jar jarfile="${build.dir}/${final.name}.jar">
<fileset dir="${build.classes}" />
<fileset dir="${conf.dir}">
<include name="**/*.properties" />
</fileset>
</jar>
</target>
<target name="clean">
<delete dir="${build.dir}" />
</target>
<dependencies>
<dependency>
<groupId>org.apache.cassandra</groupId>
<artifactId>cassandra-all</artifactId>
<version>0.8.0-rc1</version>
</dependency>
</dependencies>
</project>
An i get this Error: instance cannot be resolved or is not a field when i want to create a new RowUpdateBuilder object. 我得到这个错误:当我想创建一个新的RowUpdateBuilder对象时, 实例无法解析或不是一个字段 。 Can anybody help?
有人可以帮忙吗?
Cassandra trigger's ClassLoader is different. Cassandra触发器的ClassLoader是不同的。 So you should extract method
loadProperties
to another class and packaged into $CASSANDRA/lib
. 因此,您应该将方法
loadProperties
提取到另一个类并打包到$CASSANDRA/lib
。
in pom 在pom
<dependencies>
<dependency>
<groupId>org.apache.cassandra</groupId>
<artifactId>cassandra-all</artifactId>
<version>3.6</version>
</dependency>
</dependencies>
and code must be like this, it is working for me 代码必须是这样的,它对我有用
import java.util.*;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.Mutation;
import org.apache.cassandra.db.RowUpdateBuilder;
import org.apache.cassandra.db.partitions.Partition;
import org.apache.cassandra.triggers.ITrigger;
import org.apache.cassandra.utils.FBUtilities;
import static org.apache.cassandra.cql3.CQL3Type.logger;
public class CassandraTrigger implements ITrigger{
public Collection<Mutation> augment(Partition update) {
//Hard code properties, You can do that however you want
String auditKeyspace = "test_networktopology";
String auditTable = "timestamptest";
RowUpdateBuilder audit = new RowUpdateBuilder(Schema.instance.getCFMetaData(auditKeyspace, auditTable),
FBUtilities.timestampMicros(),
update.partitionKey());
Calendar calendar = Calendar.getInstance();
audit.add("time", calendar.getTime());
return Collections.singletonList(audit.build());
}
}
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