[英]Polling SQS using dropwizard
What I am trying to achieve: 我想要实现的目标:
I want to make a dropwizard client that polls Amazon SQS. 我想制作一个投票亚马逊SQS的dropwizard客户端。 Whenever a message is found in the queue, it is processed and stored.
只要在队列中找到消息,就会对其进行处理和存储。
Some information about the processed messages will be available through an API. 有关已处理消息的一些信息将通过API提供。
Why I chose Dropwizard: 我为什么选择Dropwizard:
Seemed like a good choice to make a REST client. 看起来像是制作REST客户端的好选择。 I need to have metrics, DB connections and integrate with some Java services.
我需要有指标,数据库连接并与一些Java服务集成。
What I need help with: 我需要帮助的是:
It is not very clear how and where the SQS polling will fit in a typical dropwizard application. 目前尚不清楚SQS轮询在典型的dropwizard应用程序中的适用方式和位置。
Should it be a managed resource? 它应该是一个托管资源吗? Or a console reporter console-reporter ?
还是一个控制台记者控制台 - 记者 ? Or something else.
或者是其他东西。
You can use com.google.common.util.concurrent.AbstractScheduledService
to create a consumer thread and add it to the dropwizard's environment lifecycle as ManagedTask
. 您可以使用
com.google.common.util.concurrent.AbstractScheduledService
创建使用者线程,并将其作为ManagedTask
添加到dropwizard的环境生命周期中。 Following is the pseudocode - 以下是伪代码 -
public class YourSQSConsumer extends AbstractScheduledService {
@Override
protected void startUp() {
// may be print something
}
@Override
protected void shutDown() {
// may be print something
}
@Override
protected void runOneIteration() {
// code to poll on SQS
}
@Override
protected Scheduler scheduler() {
return newFixedRateSchedule(5, 1, SECONDS);
}
}
In Main
do this - 在
Main
做这个 -
YourSQSConsumer consumer = new YourSQSConsumer();
Managed managedTask = new ManagedTask(consumer);
environment.lifecycle().manage(managedTask);
As an alternative to RishikeshDhokare's answer , one can also go ahead with the following code which does not need to include additional jar as a dependency in your project to keep the uber jar as much lightweight as possible. 作为RishikeshDhokare的答案的替代方案,人们还可以继续使用以下代码,这些代码不需要在项目中包含额外的jar作为依赖项,以保持uber jar尽可能轻量级。
public class SQSPoller implements Managed, Runnable {
private ScheduledExecutorService mainRunner;
@Override
public void start() throws Exception {
mainRunner = Executors.newSingleThreadScheduledExecutor()
mainRunner.scheduleWithFixedDelay(this, 0, 100, TimeUnit.MILLISECONDS);
}
@Override
public void run() {
// poll SQS here
}
@Override
public void stop() throws Exception {
mainRunner.shutdown();
}
}
And in the run() of your Application class, you can register the above class as follows. 在Application类的run()中,您可以按如下方式注册上述类。
environment.lifecycle().manage(new SQSPoller());
You can use either scheduleWithFixedDelay() or scheduleAtFixedRate() depending upon your use case. 您可以使用scheduleWithFixedDelay()或scheduleAtFixedRate(),具体取决于您的用例。
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