message-queue

问题 I have a custom class derived from CWnd that I would like to post a message to from a worker thread. I am using the PostMessage function to achieve this. The first argument to PostMessage is the HWND type handle to my class, and the next is the message I would like handled. For the first parameter, I generate the handle to my class using GetSafeHwnd() function, and for the second parameter, I use WM_USER+3. Also, I declare a message map inside my class header file, and add an entry for the

问题 I installed R 's Rjms package as I want to send messages to an ActiveMQ message queue already set up (called test ) for me. As Rjms is not on CRAN, I installed it from github using the directions in ActiveMQ package for R. However, I noted two things. When installing Rjmsjars , I received a warning saying No man pages found in package ‘Rjmsjars’ . I think this is likely unrelated, but I wanted to include this just in case. library(devtools) install_github("cran/Rjmsjars") install_github(

问题 Not that it wouldn't be easy (or fun) enough to write one, it makes sense not to re-invent the wheel so to speak. I've had a look around at various attempts, but I don't seem to have yet come across an implementation that supports these criteria; Simple queue OSS system with MongoDB persistence; C# Driver (official) based (so full POCO serialization) Tailable cursors rather than polling handles message timeout (GC correctly) handles consumer failure (ideally crash detecting re-insertion, but

问题 I want to use protobuf instead of Json to communicate between message queue. I know how to deal with it when there is only one proto message. Assume that the proto file is: //person.proto syntax = "proto3"; option java_outer_classname = "PersonProto"; message Person { int32 id = 2; string name = 1; string email = 3; } Now, i can deal with it with the approach below: PersonProto.Person person = PersonProto.Person.newBuilder() .setEmail("123@test.com") .setId(1) .setName("name-test") .build();

问题 Heroku supports multiple types of dyno configurations and allows us to set both a web and a worker process type for an app, for example like so: web: vendor/bin/heroku-php-apache2 web/ worker: php worker/myworker.php The web dyno will handle the web traffic, meanwhile the worker dyno type can be used as a background job (e.g.: to process a queue.) The docs didn't make it clear to me how these workers function, i.e.: how do they start? behave? In particular: Are they run just once at

问题 I have a list of messages in activemq queue. each message has a custom header property with value. How I should be able to access only those messages whose custom header property value = 123.? I am using something like below to pick a message from queue. How to pick all messages which or a single message which has customHeaderProperty =123.? ConsumerTemplate consumerTemplate = camelContext.createConsumerTemplate(); Exchange ex = consumerTemplate.receive("activemq:queueName",10000); String

问题 I'm developing a website with the microservice architecture, and each of the service owns a database. The database stores the data which the microservice needs. Post , Video services need the user information, so both of the services subscribed to the NEW_USER_EVENT . The NEW_USER_EVENT will be triggered when there's a new user registered. Once the services received the NEW_USER_EVENT , they put the incoming user information to each of their own database. So they can do things without asking

问题 I've implemented a typical Java Producer class which spreads messages to a Topic Durable Exchange. Well, if I follow the tutorial, and send message through this exchange with a started consumer the consumer obey to the routing key keywords. I bind my topic exchange to a queue with same routing key, and THEN I start a consumer with a non matching routing key, the message is delivered the same. In practical, persistent queue seems to ignore the routing key topic laws. Is the topic exchange

问题 Currently I'm working on a SaaS with support for multiple tenants that can enable push notifications for their user-bases. I'm thinking of using a message queue to store all pushes and send them with a separate service. That new service would need to read from the queue and send the push notifications. My question now is: Do I need to come up with a complex sending strategy? I know that with GCM has a limit of 1000 devices per request, so this needs to be considered. I also can't wait for x

问题 Let's imagine this: I have to download an XML document from an URL; I have to elaborate this document and persist its information in the database, creating or updating a lot of entites. I think the best way is to use queues. Or maybe I can also use cronjobs. My problem is this: if I use the same app to do the heavy tasks and also to show to the end user the results of those heavy tasks, it may happen that the heavy tasks slow down the main website. Take a more concrete example from real life: