java concurrency book

Lock.lock mate Condition.await/signal provided by the concurrent package. Optimistic lock that the data will not be modified, so when the data are not locked, but in the back to write the data when the time to confirm whether someone updated this data, you can use the version number and other mechanisms. It can improve the throughput of the program if it is suitable for many read and write less. If write more is prone to data inconsistency caused retry, but inefficient. The implementation can b

Java Concurrency programming: synchronizing containersTo facilitate the writing of thread-safe programs, Java provides threading and concurrency tools such as synchronization containers, concurrent containers, blocking queues, synchronizer (such as Countdownlatch). Today we are going to discuss the synchronization cont

First, the preface Borrowing Java concurrent programming practice "It's not easy to write the right program, it's even harder to write a normal concurrency program," The multithreaded thread-safety problem is subtle and unexpected compared to sequential execution, because the order of the operations in multiple threads is unpredictable without proper synchronization, This article is a simple introduction t

o'clock to continue execution together;Code Snippet 4: Public Static voidMain (string[] args) {//TODO auto-generated method stubCyclicbarrier cb =NewCyclicbarrier ( -); Executorservice es = Executors.newfixedthreadpool ( -); for(inti =0; I -; i++) {Es.execute (NewMyThread (CB)); } es.shutdown (); }Static class MyThread implements Runnable { PrivateCyclicbarrier CB; PublicMyThread (Cyclicbarrier CB) { This. cb = CB; } @Override Public voidRun () {//TODO auto-generated method stub

Learning materials from http://ifeve.com/java-concurrency-thread-directory/One, multi-threaded the difference between a process and a thread: A program runs at least one process, and a process contains at least one thread. Multithreading: Multithreading enables multiple threads to execute in parallel within a program, and a thread's execution can be thought of as a CPU executing the program, wh

) {synchronized(token)//Any object can be used as a parameter, but the object is the same for two threads.{intLen = Name.length (); for(inti =0; i ""); } } Public Static synchronized void OUTPUT3(String name) {intLen = Name.length (); for(inti =0; i ""); } }}Then one thread in the init () method calls the output1() method, and the other thread invokes the output3() method. There is no doubt that there is a thread-safety problem. But how to solve it? Because the static method is loaded w

Ownership of the stateThe object encapsulates its state, owning the state ownership, which is the ability to change the state, and if the object's reference is published, it is not the ownership of the object's exclusive state, but the ownership of the shared state with the other;2. Instance closure　　Object A is enclosed in another object B, and the path to access object A is known to facilitate thread safety, and if the data is enclosed in an object, access to the data is done through methods,

. Comparisons are consistent with the given values, and if they are consistent, they are not modified. Biased lockBased on the implementation of the lightweight lock, we know that while a lightweight lock does not support "concurrency", "concurrency" is inflated to a heavyweight lock, but a lightweight lock can support multiple threads accessing the same lock object in a serial manner.For exampl

, obviously at a very high cost. So normally concurrentlinkedqueue needs to be paired with a atomicinteger to get the queue size. This idea is used by the Blockingqueue described later.Listing 3 Calendar Queue Size public int size () {int count = 0;for (nodeif (p.getitem () = null) {Collections.size () Spec says to max outif (++count = = Integer.max_value)Break}}return count;} Resources: Simple, Fast, and practical non-blocking and Blocking Concurrent Queue algorithm

Excerpt from: www.uml-diagrams.orgHere we provide several UML class diagrams for the Java™7 java.util.concurrent package. Several java.util.concurrent.* packages introduced with version 5.0 of the Java platform added high-level concurrency feat Ures to the Java and new concurrent data structures to the

Starting from this article, we will look at the new APIs for thread operations added to us after Java 5. First, we will look at the API documentation: Java. util. concurrent contains many concurrent building blocks with good thread security, testing, and high performance. Let's take a look at the AtomicInteger under the atomic package. Import java. util. concur

http://blog.csdn.net/nicajonh/article/details/54985352 1. Background 1.1. Amazing performance Data A friend of the Circle recently told me through DMS that they implemented a cross node remote service invocation of 10W TPS (1K complex Pojo objects) by using the NETTY4 + thrift compression binary codec technique. Compared to the traditional communication framework based on Java serialization +bio (synchronous blocking IO), the performance is increas

); } issub=true; This. Notify (); } Public synchronized voidSubbusiness (inti) { while(!issub) { Try { This. Wait (); } Catch(interruptedexception e) {e.printstacktrace (); } } for(intj = 0; J ) {System.out.println ("Subbusiness" +j+ "loop of" +i); } issub=false; This. Notify (); }}Java concurrency programming: deep anatomy threadlocalEach thread has a corresp

reply, etc.) 15.java Timer (timed to execute a program, accurate to seconds, can set cycle) 16.Lucene Full-Text Search (Hibernate version) 17.Quartz (in hibernate version) 18.base64 Transferring Pictures 19. Watermark (Image watermark, text watermark ) 20. Generate or parse two-dimensional code 21.HTML5 + Java EE WebSocket Communication technology 22. Batch asynchronous upload pictures, can preview, there

name)12.app Interface (supports interaction with other language data)12. Aurora Push (push to the app for instant messages, app does not start to receive)14. Interface (interface verification, text reply, texts reply, etc.)15.java Timer (timed to execute a program, accurate to seconds, can set cycle)16.Lucene Full-Text Search (Hibernate version)17.Quartz (in hibernate version)18.base64 Transferring Pictures19. Watermark (Image watermark, text waterma