kafka consumer java

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Querying all consumer group (Java APIs) that subscribe to a topic

Problems encountered on the Internet, think of the use of existing APIs can still be achieved.First, you need to introduce Kafka server-side code, such as adding Kafka 1.0.0 dependencies:MavenGradleCompile group: ' Org.apache.kafka ', Name: ' kafka_2.12 ', version: ' 1.0.0 'Then write a method that gets all the group subscriptions to a topic, with the following code:/** * Get all subscribing

Java multithreading producer consumer, java multithreading producer

Java multithreading producer consumer, java multithreading producer Producer and consumer instances: Product Type:/*** Product type**/Public class Goods {Final int MAX_NUMBER = 30; // maximum numberFinal int MIN_NUMBER = 0; // minimum numberPrivate int number;Public Goods (int number ){Super ();This. number = number;}P

Java multithreading--producer and consumer issues

DescriptionIn Java, the communication between threads is mainly done by the 3 methods of wait,notify , and Notifyall provided by the Java.lang.Object class:After the wait method of the ① object is called, the thread enters the object's wait queue, frees the object lock, and other threads can compete to use this object lock; Thesleep method puts a thread to sleep, but the resources that the thread occupies are not released.② when an object's notify met

Using Java API creation (create), view (describe), list (list), delete Kafka theme (Topic)--Reprint

Original: http://blog.csdn.net/changong28/article/details/39325079With Kafka, we know that each time we create a Kafka theme (Topic), we can specify the number of partitions and the number of copies, and if these properties are configured in the Server.properties file, the themes generated by the subsequent call to the Java API will use the default values. Change

Java Multi-Threaded series Foundation (11) of the production of consumer issues

1. Production/consumer modelProduction/consumer issues are a very typical multithreaded problem, involving the "producer", "Consumer", "Warehouse" and "product". The relationship between them is as follows:(01) The producer will stop production only when the storage is not full and the warehouse is full.(02) Consumers can only consume goods when they are in stora

JAVA Multithreading (v) using lock, synchronized, blocking queue three ways to realize producer consumer model __java

This blog is a previous Java Multithreading (iii) Producer consumer model and the implementation of the method complement. The producer consumer model is implemented in three methods (lock, synchronized, blocking queue). The specific content is: The producer produces the random number (in order to facilitate the reading result, I limit the random number to 10 int

RABBITMQ Java Applications (2)--using spring AMQP to develop consumer applications __RABBITMQ

In the previous article we introduced the method of using RABBITMQ Java client to access RABBITMQ. However, in this way access to RABBITMQ, developers need to manage their own Connection,channel objects in the program, consumer object creation, destruction, this will be very inconvenient. Here we introduce the use of spring AMQP to connect RABBITMQ to receive and send messages. Spring AMQP is a spring subpr

Consumer producer model-Java thread Simulation

During this time, I have been working as a Java course TA with my tutor. Every day, I am bored with those boring questions! Today I finally met them with a difficult question: Solve a single producer, single consumer problem using wait () and consumer y (). the producer must not overflow the generator's buffer, which can happen if the producer is faster than the

Java implementation of producer consumer problems

Producers and consumers are multi-threaded classic problem, the core of producer and consumer problem is the synchronization problem, the core of synchronization problem is to ensure the integrity of the same resource by multiple threads concurrent access, the common method is to use a signal or lock mechanism, to ensure that resources can only be accessed by one thread at any one time. There are 4 main ways that this problem can be implemented in

Producer consumer issues, Java implementations

, so the communication between them is actually to read and write the shared resources . Of course, mutually exclusive means may be required to ensure data consistency.Tips Now I think you can understand the relevant knowledge points of Java thread synchronization.A "shared resource", such as a member variable in a class, that is referred to as thread synchronization, which is actually shared by threads in the heap or in the method area in me

Producer consumer model of Java concurrency

queue. 5. The producer cannot place the product in the cache queue when the cache queue is full. 6. When the cache queue is empty, consumers cannot fetch products from the cache queue. The cache queue in this sample mimics the Arrayblockingqueue in the Java JDK, which is a blocking queue that automatically suspends the producer thread itself when the cache pool is full, and automatically suspends the consume

Java thread (14): Concurrent collaboration-producer consumer model

Java thread: Concurrent collaboration-producer consumer model is the most classic model for multi-threaded programs, regardless of any programming language. Just like learning every programming language, Hello World! Are the most classic examples. In fact, it should be accurate to say that it is the "producer-consumer-warehouse" model. After leaving the warehouse

Java multithreaded design pattern (2) producer and consumer models

1 Producer-consumer PatternProducer-consumer pattern is mainly to create a "bridge participant" between producer and consumer, to solve the mismatch between producer thread and consumer thread speed.When you want to transfer data from a thread produccer a participant to another thread

Java Producer-Consumer

= Sex;isempty = Boolean.false;con.signal ();} catch (Interruptedexception e) {e.printstacktrace ();} finally {Lock.unlock ();}} /** * consume */public void get () {lock.lock (); Empty.equals (Boolean.false)) {//Storage area is empty, consumer should wait for try {con.await ();} catch (Interruptedexception e) {e.printstacktrace () ;}} try {String name = GetName (); String sex = Getsex (); System.oUT.PRINTLN (name +--+ + sex);//empty = Boolean.true;con

Create with Java API, view (describe), enumerate (list), delete Kafka theme (Topic)

With Kafka, we know that each time we create a Kafka theme (Topic), we can specify the number of partitions and the number of copies, and if these properties are configured in the Server.properties file, the themes generated by the subsequent call to the Java API will use the default values. Change first need to use command bin/

Java-linked list source code principle analysis, and build a queue through the consumer list, java-linked list

Java-linked list source code principle analysis, and build a queue through the consumer list, java-linked list Here we will introduce the simplest linked list listing; Let's take a look at the add () method: public boolean add(E e) { linkLast(e); return true; } void linkLast(E e) { final Node The add principle is: 1. first obtain the last

Java instance of Kafka communication

Depend on: Kafka_2.12-2.0.0.jar, Kafka-clients-2.0.0.jar, Log4j-1.2.17.jar, Slf4j-api-1.7.25.jar, Slf4j-log4j12-1.7.25.jar Lkafkaconstants.java Packagekafka_proj; Public Interfaceikafkaconstants { Public StaticString kafka_brokers = "192.168.65.130:9092"; //Public static String kafka_brokers = "192.168.65.130:9092, 192.168.65.131:9092, 192.168.65.132:9092"; Public StaticInteger Message_count = 1000; Public StaticString client_

Java static block consumer 1, java static

Java static block consumer 1, java static The static block of the class is executed when the class is loaded. It is executed only once before the constructor. The following example is helpful: 1 package untility; 2 3 public class A {4 // static block 5 static {6 A c; 7 System. out. println (200); 8 c = new A (); 9 I = 10; 10} 11 12 public static int I; 13 publ

Java concurrency (basic knowledge)-blocking queue and producer consumer Mode

Java concurrency (basic knowledge)-blocking queue and producer consumer Mode1. Blocking Queue BlockingQueue is a thread-safe Queue version. It can be seen from its name that it supports blocking Queue implementation: When requesting data from an empty BlockingQueue, it will block BlockingQueue to a non-empty value. When inserting data into a full BlockingQueue, the thread will block BlockingQueue to be inse

Java Threading: Concurrent collaboration-producer consumer models

.start (); T2.start (); T3.start (); T4.start (); }} class MyThread extends Thread {PrivateDeadlockrisk dead;Private intA, B; MyThread (Deadlockrisk dead,intAintb) { This. Dead = dead; This. A = A; This. B = b; } @Override Public void Run() {dead.read (); Dead.write (A, b); }} class Deadlockrisk {Private Static classResource { Public int value; }PrivateResource Resourcea =NewResource ();PrivateResource RESOURCEB =NewResource (); Public int Read() {

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