如何在c ++应用程序中使用solr

时间:2014-09-04 00:29:45

标签: java c++ solr sqlite

我正在用c ++开发应用程序,我想使用solr索引sqlite数据库,我在网上搜索,我发现我需要使用JNI: http://randr.svbtle.com/experiment-with-embedded-solr-in-java-and-c 但我找到了JARS的许多问题(我使用了\ solr-4.9.0 \ dist \ solrj-lib和\ solr-4.9.0 \ dist和\ solr-4.9.0 \ example \ lib \ ext下的jar) 我知道我也可以使用JCC,我的问题是什么是最好的解决方案,如果是JNI,你可以向我详细说明如何配置从c ++应用程序调用solr以及我需要的罐子

1 个答案:

答案 0 :(得分:0)

我之前从未使用过Solr,但这是使用JavaCPPMaven进行此操作的唯一方法。首先,创建此pom.xml构建文件:

<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>solrtest</artifactId>
    <version>0</version>
    <dependencies>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacpp</artifactId>
            <version>0.9</version>
        </dependency>
        <dependency>
            <groupId>org.apache.solr</groupId>
            <artifactId>solr-solrj</artifactId>
            <version>1.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.solr</groupId>
            <artifactId>solr-core</artifactId>
            <version>1.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.7</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.7</version>
        </dependency>   
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.bytedeco</groupId>
                <artifactId>javacpp</artifactId>
                <configuration>
                    <header>true</header>
                    <includePath>.</includePath>
                    <linkPath>.</linkPath>
                    <preloadPath>.</preloadPath>
                </configuration>
                <executions>
                    <execution>
                        <id>process-classes</id>
                        <phase>process-classes</phase>
                        <goals>
                            <goal>build</goal>
                        </goals>
                    </execution>
                </executions>
                <dependencies>
                    <dependency>
                        <groupId>org.apache.solr</groupId>
                        <artifactId>solr-solrj</artifactId>
                        <version>1.4.1</version>
                    </dependency>
                    <dependency>
                        <artifactId>solr-core</artifactId>
                        <groupId>org.apache.solr</groupId>
                        <version>1.4.1</version>
                    </dependency>
                </dependencies>
            </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.3</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
        </plugins>
    </build>
</project>

以及此src/main/java/SolrTest.java源文件:

import java.io.*;
import org.apache.solr.core.*;
import org.apache.solr.client.solrj.*;
import org.apache.solr.client.solrj.embedded.*;
import org.bytedeco.javacpp.*;
import org.bytedeco.javacpp.annotation.*;

public class SolrTest {
    static SolrServer createServer(String coreName) throws Exception {
        CoreContainer coreContainer = new CoreContainer();
        CoreDescriptor discriptor = new CoreDescriptor(coreContainer, coreName, new File("/some/path/", coreName).getAbsolutePath());
        SolrCore solrCore = coreContainer.create(discriptor);
        coreContainer.register(solrCore, false);
        return new EmbeddedSolrServer(coreContainer, coreName);
    }

    static class Query extends FunctionPointer {
        public @Name("query") String call(String string) throws Exception { 
            createServer(string);
            return string;
        }
    }
}

然后我们可以执行mvn package,在它下载了大量内容并为我们构建内容之后,我们将最终得到target/solrtest-0.jar以及头文件和target/classes子目录中的本机库文件。现在,我们可以用C ++这样的程序将所有这些链接在一起:

#include <iostream>
#include "target/classes/jniSolrTest.h"

int main() {
    const char *argv[] = { "-Djava.class.path=target/solrtest-0.jar" };
    JavaCPP_init(1, argv);
    try {
        query("test");
    } catch (std::exception &e) {
        std::cout << e.what() << std::endl;
    }
    JavaCPP_uninit();
}

例如,我们可以在Linux x86_64下以这种方式编译和运行,但我们可以在其他平台上执行相同的操作:

$ g++ -I/usr/lib/jvm/java/include/ -I/usr/lib/jvm/java/include/linux/ target/classes/linux-x86_64/libjniSolrTest.so query.cpp -o query
$ ./query

我们从Solr得到一个正当的例外:

[main] INFO org.apache.solr.core.SolrResourceLoader - JNDI not configured for solr (NoInitialContextEx)
[main] INFO org.apache.solr.core.SolrResourceLoader - solr home defaulted to 'solr/' (could not find system property or JNDI)
[main] INFO org.apache.solr.core.SolrResourceLoader - Solr home set to '/some/path/test/'
java.lang.RuntimeException: Can't find resource 'solrconfig.xml' in classpath or '/some/path/test/conf/', cwd=/home/saudet/solrtest

我们可以通过为Solr安装东西来修复...