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Apache-Ignite入门实战之一

简介

Apache Ignite 内存数据组织框架是一个高性能、集成化和分布式的内存计算和事务平台，用于大规模的数据集处理，比传统的基于磁盘或闪存的技术具有更高的性能，同时他还为应用和不同的数据源之间提供高性能、分布式内存中数据组织管理的功能。

安装

从 https://ignite.apache.org/download.cgi#binaries 下载最新的安装包，这里我下载的是 apache-ignite-fabric-2.3.0-bin.zip 包。下载后解压就可以直接使用了。

运行

进入到 ${IGNITE_HOME}/bin 目录，然后运行

./ignite.sh
...
[00:24:04] To start Console Management & Monitoring run ignitevisorcmd.{sh|bat}
[00:24:04]
[00:24:04] Ignite node started OK (id=01af1a02)
[00:24:04] Topology snapshot [ver=1, servers=1, clients=0, CPUs=2, heap=1.0GB]
...

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其中：

  • servers=1 表示当前 Ignite 集群中只有一个节点。
  • clients=0 表示当前没有客户端连接到此集群。

此时，我们可以在另外一台机器上运行同样的命令来再启动一个 Ignite，此时我们就可以看到

...
[00:41:21] Topology snapshot [ver=2, servers=2, clients=0, CPUs=2, ...
...

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可以看到 servers=2，说明有一个新节点加入了集群。

测试

Ignite 集群已经有了，下面我们来看看怎样使用 Ignite 作为分布式缓存系统使用。

首先建立一个 Maven 工程，pom.xml 文件内容如下:

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>my.ignitestudy</groupId>
    <artifactId>ignitestudy</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>ignitestudy</name>
    <url>http://maven.apache.org</url>
    <properties>
        <ignite.version>2.3.0</ignite.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.1</version>
        </dependency>

        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
        </dependency>

        <dependency>
            <groupId>org.apache.ignite</groupId>
            <artifactId>ignite-core</artifactId>
            <version>${ignite.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.ignite</groupId>
            <artifactId>ignite-spring</artifactId>
            <version>${ignite.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.ignite</groupId>
            <artifactId>ignite-indexing</artifactId>
            <version>${ignite.version}</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                    <compilerArguments>
                        <extdirs>${project.basedir}/lib</extdirs>
                    </compilerArguments>
                </configuration>
            </plugin>

            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

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下面是 Java 中怎样使用 Cache 的例子

package my.ignitestudy.datagrid;

import org.apache.ignite.Ignite;
import org.apache.ignite.IgniteCache;
import org.apache.ignite.Ignition;
import org.apache.ignite.configuration.IgniteConfiguration;
import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
import org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder;
import org.apache.ignite.transactions.Transaction;

import java.util.Arrays;

public class Test {
    public static void main( String[] args ) throws Exception {
        Ignite ignite = getIgnite();
        testGetPut(ignite);
        testAtomOperation(ignite);
    }

    private static Ignite getIgnite() {
        TcpDiscoverySpi spi = new TcpDiscoverySpi();
        TcpDiscoveryVmIpFinder ipFinder = new TcpDiscoveryVmIpFinder();
        ipFinder.setAddresses(Arrays.asList("192.168.0.192:47500..47509"));
        spi.setIpFinder(ipFinder);
        IgniteConfiguration cfg = new IgniteConfiguration();
        cfg.setDiscoverySpi(spi);
        cfg.setClientMode(true);

        Ignite ignite = Ignition.start(cfg);
        return ignite;
    }

    private static void testGetPut(Ignite ignite) {
        IgniteCache<String, String> cache = ignite.getOrCreateCache("myCache");

        for (int i = 0; i < 10; i++) {
            cache.put("mykey_" + i, "myvalue_" + i);
        }

        for (int i = 0; i < 10; i++) {
            String key = "mykey_" + i;
            System.out.println("Got [key=" + key + ", val=" + cache.get(key) + ']');
        }
    }

    private static void testAtomOperation(Ignite ignite) {
        IgniteCache<String, Integer> cache = ignite.getOrCreateCache("myCache");

        Integer oldValue = cache.getAndPutIfAbsent("MyKey", 11);
        System.out.println("MyKey: " + oldValue);

        boolean success = cache.putIfAbsent("MyKey", 22);
        System.out.println("MyKey: " + success);

        oldValue = cache.getAndReplace("MyKey", 11);
        System.out.println("MyKey replace: " + oldValue);

        success = cache.replace("MyKey", 22);
        System.out.println("MyKey replace: " + success);

        success = cache.replace("MyKey", 2, 22);
        System.out.println("MyKey replace: " + success);

        success = cache.remove("MyKey", 1);
        System.out.println("MyKey remove: " + success);
    }
}

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上面 Java 代码中我们是使用编程的方式来连接集群，如下：

TcpDiscoverySpi spi = new TcpDiscoverySpi();
TcpDiscoveryVmIpFinder ipFinder = new TcpDiscoveryVmIpFinder();
ipFinder.setAddresses(Arrays.asList("192.168.0.192:47500..47509"));
spi.setIpFinder(ipFinder);
IgniteConfiguration cfg = new IgniteConfiguration();
cfg.setDiscoverySpi(spi);
cfg.setClientMode(true);

Ignite ignite = Ignition.start(cfg);

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也可以使用指定的配置文件来获取到集群的连接，比如：

Ignite ignite = Ignition.start("... config file path ...");

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