OSGi karaf scheduler

karaf 中提供了定时任务管理，只需安装 feature:install scheduler 即可，然后在 karaf 容器中发布 org.apache.karaf.scheduler.Job 服务，具体见 4.19. Scheduler

1. 环境准备

<parent>

    <groupId>org.apache.karaf</groupId>

    <artifactId>karaf</artifactId>

    <version>4.1.5</version>

</parent>

<groupId>com.github.binarylei</groupId>

<artifactId>osgi-scheduler</artifactId>

<packaging>bundle</packaging>

<dependencies>

    <dependency>

        <groupId>org.osgi</groupId>

        <artifactId>org.osgi.core</artifactId>

    </dependency>

    <dependency>

        <groupId>org.osgi</groupId>

        <artifactId>org.osgi.compendium</artifactId>

    </dependency>

    <dependency>

        <groupId>org.apache.karaf.scheduler</groupId>

        <artifactId>org.apache.karaf.scheduler.core</artifactId>

    </dependency>

</dependencies>

<build>

    <resources>

        <resource>

            <directory>${project.basedir}/src/main/resources</directory>

            <filtering>true</filtering>

            <includes>

                <include>**/*</include>

            </includes>

        </resource>

    </resources>

    <plugins>

        <plugin>

            <groupId>org.apache.felix</groupId>

            <artifactId>maven-bundle-plugin</artifactId>

            <configuration>

               <!-- <obrRepository>NONE</obrRepository>

                <instructions>

                    <_include>-bnd.bnd</_include>

                </instructions>-->

            </configuration>

        </plugin>

        <plugin>

            <groupId>org.apache.aries.blueprint</groupId>

            <artifactId>blueprint-maven-plugin</artifactId>

            <version>1.5.0</version>

            <executions>

                <execution>

                    <goals>

                        <goal>blueprint-generate</goal>

                    </goals>

                </execution>

            </executions>

            <configuration>

                <scanPaths>

                    <scanPath>com.github.binarylei</scanPath>

                </scanPaths>

            </configuration>

        </plugin>

    </plugins>

</build>

2. 编写定时任务

package com.github.binarylei.scheduler;

import org.apache.karaf.scheduler.Job;

import org.apache.karaf.scheduler.JobContext;

import org.apache.karaf.scheduler.Scheduler;

import org.osgi.service.component.annotations.Component;

/**

 * @author: leigang

 * @version: 2018-03-22

 */

public class SchedulerPing implements Job {

    @Override

    public void execute(JobContext context) {

        context.getConfiguration();

        System.out.println("---------------");

    }

}

在 OSGI-INF/blueprint 中 blueprint.xml 配制文件发布 Job 服务：

<?xml version="1.0" encoding="UTF-8"?>

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

           xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 https://osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">

    <bean id="schedulerPing" class="com.github.binarylei.scheduler.SchedulerPing"/>

    <service interface="org.apache.karaf.scheduler.Job" ref="schedulerPing">

        <service-properties>

            <entry key="scheduler.expression" value="0/2 * * * * ?"/>

        </service-properties>

    </service>

</blueprint>