java concurrency book

= new Reentrantlock ()//The default use of unfair locks, if you want to use a fair lock, you need to pass in the argument true ... Lock.lock (); try { //Update object status //catch exception, revert to original invariant constraint if necessary//if there is return statement, put it here } finally { lock.unlock (); The lock must be released in the finally block comparison between Reetranklock and synchronizedPerformance Comp

die knock java concurrency "-----j.u.c java Concurrency container: concurrenthashmap HashMap is a collection that we use very frequently, but because it is not thread-safe, in a multithreaded environment, put operations are likely to produce a dead loop, resulting in CPU utilization approaching 100%. To solve this pro

Reprint Please specify source:http://blog.csdn.net/ns_code/article/details/17511147Blocking QueuesThe blocking queue is the content in the new Java 5 concurrency feature, and the interface for the blocking queue is Java.util.concurrent.BlockingQueue, which has multiple implementation classes: Arrayblockingqueue, Delayqueue, Linkedblockingqueue, Priorityblockingqueue, Synchronousqueue, etc., the use of a sim

I have always believed that it is always best to learn about any new technology and the excellent books related to it. Of course, a good video tutorial can help you get to know the technology quickly, but to learn the technology in depth and in a systematic way, the best books are especially important. In combination with my own experience and lessons learned from Java, I make a list of some good books I've seen, which is my suggested reading order.1.

Concurrency overview>> SyncHow to synchronize access to shared resources by multiple threads is one of the most basic problems in multithreaded programming.When multiple threads access shared data concurrently, the data is in an intermediate or inconsistent state, which affects the correct operation of the program. We often call this a race condition (race condition), which is called a critical area (critical section) for concurrent access to shared d

logical error in the subordinate business.Synchronous operationConcurrent operation also need to maintain the consistency of data, more or less involves synchronous operation. Proper use of atomic operations and proper use of exclusive and read-write locks is also a big challenge.Coordination and communication between threads, especially state synchronization, are more difficult. We see the implementation of thread pool threadpoolexecutor in order to solve the execution state of various threads

; }} enq (node);return node; Where the queue operation is as follows/*** Inserts node into queue, initializing if necessary. See picture above.* @param node The node to insert * @return node ' s predecessor*/private node Enq (Final node node) { For (;;) {Node T =tail; if (t = = null) { //must initialize if (Compareandsethead (new Node ())) tail = head; }else {Node.prev = t; if (compareandsettail (t, node)) { T.next = node; return T; }}}} Abstractqueuedsynchronizer has two main methods: the A

1. Longadder and Atomiclong similar use, but the performance is better than Atomiclong. Both Longadder and Atomiclong use atomic operations to improve performance. But longadder on the basis of Atomiclong, hot spot separation is similar to the reduction of lock granularity in the lock operation, and a lock is separated into several locks to improve performance. In the absence of locks, a similar approach can be used to increase the success rate of CAS, thereby improving performance. Longadder

1th Course Introduction (Java Concurrent Programming Advanced course)What is Disruptor? It is a high-performance asynchronous processing framework, known as the "single-threaded processing of 600W orders per second" artifact, the goal of this course: a thorough mastery of such an excellent open source framework, interview seconds to kill the interviewer. This chapter will lead the small partners to understand the syllabus and focus, and then simulate

Multithreaded programming also brings some security issues while improving program performance, producing unpredictable results. The reason for this is that the sequence of operations in each thread in multiple threads is unpredictable, and the resource operations shared by each thread are likely to interact with each other. For example, statistics on the number of accesses to a page, the value of an int type is accumulated, each thread accepts the user request will be added to the int type. The

19) Java concurrency, 19java concurrency > Synchronized Synchronized keyword, It includes two usage methods: synchronized Method and synchronized Block. 1> synchronized Method: Declare the synchronized Method by adding the synchronized keyword to the method declaration. Public synchronized void accessVal (int newVal ); The synchronized method controls access

What is AOP in the Java programmer interview test book? A programmer interview test book AOP (Aspect-Oriented Programming) is a supplement to object-oriented development, it allows developers to dynamically modify the model without changing the original model to meet new requirements. For example, you can dynamically add log, security, or exception handling funct

java.util.concurrent.ExecutionException exception,This is because our submitted task java.util.concurrent.Callable allows any exception to be thrown in the call () method, and the regular thread execution may throw a runtimeexception, so it simply wraps up all the exceptions, Executionexception thrown as an exception that occurs during execution.The above is the entire anomaly system, all concurrent operation exceptions can be attributed to the above categories.In many cases processing time is

threads are created in the code above, there can be only one thread executing concurrently. The semaphore method Semaphore (int permits) accepts an integer number that represents the number of licenses available. Semaphore (10) indicates that 10 threads are allowed to obtain a license, that is, the maximum number of concurrent is 10. Semaphore is also very simple to use, first the thread uses the semaphore acquire () method to obtain a license, and then call the release () method to return the

Java old A This book for a long time, yesterday finally began to china-pub on the pre-sale, other sites may be slower, but since the call presale, it must have not arrived.Interested people can go to see Kazakhstan (subsequent other website addresses will also be published here):Http://search.china-pub.com/s/?key1=java%cc%d8%d6%d6%b1%f8type=pz=1For the contents o

Unit,BlockingqueueThreadfactory Threadfactory,Rejectedexecutionhandler handler)For the thread pool, if there is always a backlog of tasks, you can increase the corepoolsize size appropriately, and if the machine load is low, you can increase the maximumpoolsize size appropriately. , reducing the KeepAliveTime time in a task queue can help reduce the load, and the length of the task queue and the task queue's deny policy also have some impact on the processing of the task.In layman's

of global best-selling, widely acclaimed. 9th Edition According to JavaSE7 Comprehensive update, at the same time revised the 8th version of the shortcomings, the system fully explain the Java language core concepts, syntax, important features and development methods, including a large number of cases, practical.:Java Core Technology Vol. 14.The art of Java

specification, but a readable book that introduces the characteristics of each language. The book is well balanced in rigor and education, enabling programmers to quickly be attracted to the Java language (and its rich class libraries). Concurrent Programming in Java:design Principles and Patterns (Doug Lea) Concurrent Programming in Java:design Principles and

what makes you a better programmer is learning how to think, because eventually you convert the logic in your mind into a series of instructions for manipulating your computer so that the computer can follow the instructions to solve the problem.Learning how to think correctly-how to abstract, how to combine, how to analyze information, how to self-examine-can be done in a variety of ways, far from programming.There is a book: "Hackers and painters",

solve competition?This is an issue that appears in the advanced stages of a multithreaded interview. Most interviewers will ask about the competitive conditions you've met recently and how you've solved them. Some time they will write simple code, and then let you detect the code's competitive conditions. You can refer to the article I published earlier about the Java competition criteria. In my opinion this is one of the best