java concurrency in practice amazon

Http://www.ibm.com/developerworks/cn/java/j-jtp06197.htmlThe Java™ language contains two intrinsic synchronization mechanisms: synchronous blocks (or methods) and volatile variables. Both of these mechanisms are proposed to achieve the security of code threads. Where volatile variables are less synchronous (but sometimes simpler and less expensive), and their use is more error-prone. In this period of

Guidelines for using volatile variablesThe Java™ language contains two intrinsic synchronization mechanisms: synchronous blocks (or methods) and volatile variables. Both of these mechanisms are proposed to achieve the security of code threads. Where volatile variables are less synchronous (but sometimes simpler and less expensive), and their use is more error-prone. In this period of Java theory and

Once an object is created, it will no longer change its contents, so that the object is immutable. This can be done without worrying about competition management when accessing objects in multiple threads, and Java's string is an example of an immutable object. Based on this, when you use Scala to create multithreaded applications, you can write unlocked code with the invariant state (immutable states) to write concise multithreaded code without worrying about data contention between threads and

Java5 adds a new class library concurrency set Java.util.concurrent, which provides rich APIs for concurrent programs that are easier and more flexible in Java 5. This article through a network server model, to practice JAVA5 multithreaded programming, the model used in the JAVA5 thread pool, blocking queues, can be reset locks, but also

Many Java™ language methods, such as Thread.sleep() and Object.wait() , can be thrown InterruptedException . You cannot ignore this exception because it is a check exception (checked exception). But what should be done about it? In Java theory and practice this month, the concurrency expert Brian Goetz will explain Int

Java Theory and Practice: using Volatile variables correctly Volatile variables in the Java language can be thought of as "light", and synchronized synchronized volatile variables require less coding and run-time overhead than blocks, but only part of the functionality that they can implement synchronized . This article describes several patterns for using vo

In some high-concurrency programs, or a lot of memory for the calculation of the program, sometimes encountered some of the problems: The program just started to run very fast, and then run slowly down, even to a certain time there will be oom or StackOverflow and other errors. To understand the root causes of these errors, it is necessary to understand how the JVM divides, manages, and reclaims memory, and this blog will discuss these topics from the

non-argument constructor has two methods: Constructor: Exchanger () creates a new Exchanger. Method: Exchange (V x): Wait for another thread to reach this switching point (unless the current thread is interrupted), send the given object to this thread, and receive the object of this thread.Exchange (V x, long timeout, TimeUnit unit): Wait for another thread to reach this switching point (unless the current thread is interrupted or exceeds the specified wait time ), then, the given object is tra

strictly follow the use of volatile conditions-that is, the variable is really independent of the other variables and its own previous values-in some cases you can use the volatile substitution synchronized to simplify the code. However, volatile the code used is often more error-prone than code that uses locks. The pattern described in this article covers some of the most common use cases that can be used volatile instead synchronized . Following these patterns (not exceeding their limits when

Volatile variables in the Java language can be thought of as "light", and synchronized synchronized volatile variables require less coding and run-time overhead than blocks, but only part of the functionality that they can implement synchronized . This article describes several patterns for using volatile variables effectively, and highlights several scenarios where volatile variables are not appropriate. The lock provides two main features: Mutual ex

-based method or temporal table method, you should first look for a set-based solution to solve the problem, and the set-based approach is generally more efficient.22. Try to avoid large transaction operation and improve the system concurrency ability.23. Try to avoid the return of large data to the client, if the amount of data is too large, should consider whether the corresponding demand is reasonable.By doing Itoo from V1.0 To V3.0, plus the previ

PrivateRabbittemplate rabbittemplate; Public void SendCall(String content) { for(inti =1; I 3; i++) {LongExpiration = i * the; String message = i +"-"+ content; System. out.println(String. Format("Sender:%s", message)); Rabbittemplate.Convertandsend(Mqconstant.Delay_call_ttl, (Object) message,New Expirationmessagepostprocessor(expiration)); } }}Server:@Componentpublic class Server { @Async @RabbitHandler @RabbitListener(queues = MQConstant.CALL) public void callProcess(String

You need to implement a multithreaded concurrency business scenario, start several sub-threads, and finally end up with all the child threads running at the end. (Task WaitAll similar to. NET)The Executorservice multithreaded programming model in Java provides a mechanism for introducing it through code.Method One: Executorservice#awaittermination/** * Blocks until all tasks has completed execution afte

Volatile variables in the Java language can be thought of as "light", and synchronized synchronized volatile variables require less coding and run-time overhead than blocks, but only part of the functionality that they can implement synchronized . This article describes several patterns for using volatile variables effectively, and highlights several scenarios where volatile variables are not appropriate.The lock provides two main features: Mutual exc

Observer mode is common in Swing development, and is useful for eliminating the coupling of components in scenarios other than GUI applications. However, there are still some common flaws in the registration and invocation of listeners. In this period of Java theory and practice, Java expert Brian Goetz offers some good advice on how to make a good listener and h