consumer | 易学教程

Consuming Spring Hateoas Pageable

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问题 I have a Rest-Service using HAteoas, what worked before without pageing. Now I am producing pageable Json. I did it with out-of-the box features from Spring-Hateoas. But now I am stucking consuming it and I guess it is really not well documented, if it is. My JSON looks like follows: { "_embedded": { "vertragResourceList": [ { "identifier": 728, "auszubildender": "Rumm", "beruf": "Landwirt/in", "betrieb": "Mitterbauer Johann", "betriebsNummer": "e12d0949-67ae-4134-9dc2-fb67758b6b16",

Consuming Spring Hateoas Pageable

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Returning Method value inside a Consumer expression

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问题 I'm trying to return a boolean inside a Method and i'm using a consumer function. Is there any way to return that value directly inside that Consumer expression? Here's the Code: private static boolean uuidExists(UUID uuid) { MySQL.getResult("", rs -> { try { if(rs.next()){ return rs.getString("UUID") != null; } } catch (SQLException e) { } }); return false; } EDIT: I know that i could create a boolean and change that value but i do not wanna do that. EDIT: getResult code: public static void

How to code consumer.producer with python asyncio?

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问题 My Python version is 3.6.1. I wrote something to implement a model of consumer-producer with Python asyncio. But it doesn't work as expected. Four events all created but none of any print export. async def consumer(queue, id): while True: val = await queue.get() print('{} get a val: {}'.format(id, val)) await asyncio.sleep(1) async def producer(queue, id): for i in range(5): val = random.randint(1, 10) await queue.put(val) print('{} put a val: {}'.format(id, val)) await asyncio.sleep(1) async

Order guarantees using streams and reducing chain of consumers

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问题 So as it goes in the current scenario, we have a set of APIs as listed below: Consumer<T> start(); Consumer<T> performDailyAggregates(); Consumer<T> performLastNDaysAggregates(); Consumer<T> repopulateScores(); Consumer<T> updateDataStore(); Over these, one of our schedulers performs the tasks e.g. private void performAllTasks(T data) { start().andThen(performDailyAggregates()) .andThen(performLastNDaysAggregates()) .andThen(repopulateScores()) .andThen(updateDataStore()) .accept(data); }

BBC Consumer SQS Issues

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问题 I'm using the sqs-consumer node module package. I have the following code: init: function () { var app = Consumer.create({ queueUrl: Settings.getSetting("sendgrid-aws-sqs-queue"), batchSize: 1, visibilityTimeout: 30, waitTimeSeconds: 20, sqs: MarvelAWS.sqs, handleMessage: function (message, done) { try { var msgBody; try { msgBody = JSON.parse(message.Body); } catch (err) { msgBody = null; this._warn("parsing error handling SQS queue " + err, msgBody); } var environment = Settings.getSetting(

Collection及其师傅Iterable

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 上一节我们缕清了Collection家族的关系，接下来我们就来看看这个家族的创始者及其师傅。 1. 师傅Iterable Iterable是一个接口类，先看看接口里面的方法：其中第二个和第三个方法，都是java8新增的，看源码会发现，java8后，可以在接口里面定义默认（关键字default）的方法（必须实现，可以空实现），而且实现类中还可以重写default方法，这样一来有点类似抽象类，只不过接口类用来授艺，抽象类用来遗传。最终给我们代码的迭代带来很大便利。 Iterable里面最主要的当然迭代器Iterator，Iterator本身是接口，这么说来接口师傅（水平有限）传授的都是大道的终极要义，功夫还是得弟子苦练。后来师傅能力提升（java8来了），可以给弟子大道的精华（default方法），让弟子可以毫不费力直接领悟，甚至弟子还可以加以创新（重写），但是要注意多接口实现造成的默认方法冲突问题（冲突很容易解决，就不多说）。关于Iterator在子类的实现可以查看ArrayList源码，很简单，只是大家用得多的是next()方法，不知有没有注意到previous()方法。值得一提的是在Iterator接口里面新增了默认方法：forEachRemaining方法，允许传入一个行为

WCF MSMQ consumer thread count

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问题 What's the best way to configure the maximum number of threads that can pull messages from an MSMQ queue, using a netMsmqBinding in WCF? For example, say I have an MSMQ service for which I only want to have 2 (or 10, or whatever number of) worker threads pulling messages off at a time. 回答1: You need Service Throttling <behaviors> <serviceBehaviors> <behavior name="DefaultThrottlingBehavior"> <serviceThrottling maxConcurrentCalls="2" /> </behavior> </serviceBehaviors> </behaviors> 来源： https:/

JMS consume multiple topics

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问题 I am new to Java and working on a project that consumes multiple (different) topics and sends it to another server. I was wondering what the best way to handling multiple topics is. From what I understand each consumer is tied to one topic, so if I had to consume multiple topics I would need one consumer for each different topic. Since a consumer makes a blocking call I would need to invoke a thread per consumer to consume these topics in parallel. And if I wanted to improve throughput

DeadLock in producer Consumer

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问题 I have following classes : package com.akshu.multithreading; public class ThreadResource { static int a; static boolean Value =false; public synchronized int getA() { while(Value == false){ try { wait(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } Value= false; notify(); return a; } public synchronized void setA(int a) { while(Value == true) { try { wait(); } catch (InterruptedException e) { // TODO Auto-generated catch block e