mastering concurrency programming with java 8

lock.lockinterruptibly () to acquire a lock, if thread A acquires a lock at this point, and thread B is only waiting, then the call to thread B of the Threadb.interrupt () method can be used in the wait process of break thread B.Because an exception was thrown in the declaration of Lockinterruptibly (), lock.lockinterruptibly () must be placed in a try block or in a call to lockinterruptibly () Out-of-method declarations throw interruptedexception.Lockinterruptibly () is therefore generally use

. That is, all the mutable states of an object are encapsulated and protected by the object's own built-in lock.Java monitor patterns are used in many classes, such as vectors and HashTable.The Java monitor pattern is just a convention for writing code that, for any kind of lock object, can be used to protect the state of an object as long as it is used throughout the object. As Privatelock shows how to use a private lock to protect the state.public c

=NewProductInfo (); Info.setimage (NewProductimage ()); List.add (info); System.out.println (Thread.CurrentThread (). GetName () +"Load Products info!"+ Format.format (NewDate ()));returnList }/** * Products * * Private Static class productinfo { PrivateProductimage image; PublicProductimageGetImage() {returnImage } Public void setimage(productimage image) { This. image = Image; } }Private Static class productimage {} Public Static void Main(string[] args) {Displayproducti

Lin Bingwen Evankaka Original works. Reprint please specify the source Http://blog.csdn.net/evankakaAbsrtact: This paper mainly discusses the source code analysis of Copyonwritearraylist and Copyonwritearrayset in Java.One, copyonwritearraylist source analysisCopyonwritearraylist is not very much used in Java concurrency scenarios, because it does not fully guarantee the correctness of the read data. Its ma

achieve higher concurrency, the rendering task is first decomposed into two tasks: one is to render all the text, and the other is to download all the images:-6.3.4 limitations in the parallelism of heterogeneous tasks-6.3.5 Completionservice:executor and BlockingqueueCompletionservice combines the functions of executor and blockingqueue, and can submit callable tasks to it for execution, and then uses a take and poll method similar to the queue oper

; } while (!top.compareandset (Oldhead, Newhead)); } Public E Pop () { Node Node Do { Oldhead = top. get (); if (Oldhead = = null) return null; Newhead = Oldhead.next; } while (!top.compareandset (Oldhead, Newhead)); return oldhead.item; } private static Class node Public final E item; Public node Public Node (E item) { This.item = Item; } } } Below this did not understand, stay here record, later look: /** * Insert sort in non-blockin

java.util.concurrent.atomic.atomicinteger;import static org.junit.Assert.*; Import Org.junit.test;public class Puttaketest {private static final executorservice pool = Executors.newcachedthreadpool ();p rivate final Atomicinteger putsum = new Atomicinteger (0);p rivate final Atomicinteger Takesum = new Atomicinteger (0);p rivate final cyclicbarrier barrier;private final boundedbufferThis test should be run on a multiprocessor system. To maximize the program detection of some time-sensitive data

exclusive access is more difficult and expensive than using a single lock for exclusive access. For example, when the CONCURRENTHASHMAP needs to extend the mapping range, and the hash value of the recalculation key value is distributed to the larger bucket collection, all the locks in the collection of fragments need to be obtained.public class Stripedmap {private static final int n_locks = 16;private final node[] buckets;private final object[] lockes; public stripedmap (int num) {super (); thi

The synchronized keyword provided by Java provides thread-synchronous access to critical sections. Because it is difficult to synchronized basedThe synchronization code is written correctly, and the Concurrency tool class provides an advanced Synchronizer. Countdown latch (countdown latch), Sync screen(cyclic barrier), switch (exchanger), Semaphore (semaphore), and Phaser Synchronizer. The following mainInt

mechanism by which a lock is used so that a variable or block of code can be accessed by only one thread at a time. Instead, Threadlocal provides a copy of the variable for each thread, so that each thread accesses the same object at a certain time, isolating data sharing from multiple threads. Synchronized, in contrast, is used to gain data sharing when communicating between multiple threads.(2) Synchronized is used for data sharing between threads, while threadlocal is used for data isolation

voidMain (string[] args) {FinalCyclicbarrier Cyclicbarrier =NewCyclicbarrier (10,NewRunnable () {@Override Public voidrun () {System.out.println ("Ready" +NewDate ()); } }); Executorservice Executorservice= Executors.newfixedthreadpool (10); for(inti=0;i) {Executorservice.submit (NewRunnable () {@Override Public voidrun () {Try{Thread.Sleep (1000*NewRandom (). Nextint (20)); System.out.println ("Waiting:" +cyclicbarrier.getnumberwaiting ()+ ", Parties:" +cyclicbarrier.getparties ()+ " , " +NewD

false if it is a normal thread. Copycat This article is from the "Java 7 Concurrency Cookbook" (D-Gua to "Java7 concurrent Sample Set") translation, only as learning materials used. No authorization shall be applied to any commercial act. Small has become The full version of all the sample code used in this section. The complete code for the event class Copy Code code as follows: Pack

. As mentioned earlier, a thread can continue executing without interrupting a request. But that's not the result we want. Copycat This article is from the "Java 7 Concurrency Cookbook" (D-Gua to "Java7 concurrent Sample Set") translation, only as learning materials used. No authorization shall be applied to any commercial act. Small has become The full version of all the code used by the sampl

, except the main thread, are daemon threadsThe difference between a normal thread and a daemon thread is only the action that occurs when the thread exits. When a thread exits, the JVM checks for other running threads, and if those threads are daemons, the JVM exits gracefully. When the JVM is stopped, all remaining daemons are discarded-neither the finally code block nor the rollback stack is executed, and the JVM simply exits3, terminator (clean file handle or socket handle, etc.)--Avoid usin

; Public classTicketSeller4 {StaticQueueNewConcurrentlinkedqueue(); Static { for(inti=0; ii); } Public Static voidMain (string[] args) { for(inti=0; i) { NewThread ((){ while(true) {String s=Tickets.poll (); if(s = =NULL) Break; ElseSystem.out.println ("Sold--" +s); }}). Start (); } }}Operation Result:When we switch to concurrent container concurrentlinkedqueue, we call the poll method to ticket sales until the number of votes is 0 o'clock, th

objects (if the semantics of global variables allow). However, if you convert an application-scoped cache to a thread-local cache, it does not have much effect.Threadlocal is used extensively when implementing the application framework. For example, during an EJB call, the Java EE container needs to associate a transaction context (Transaction context) with a thread in execution. By saving the transaction context in a static Threadlocal object, you c

use:Customizing a callableClass HandlefutureFirst, Futuer.public static void Futuretest () throws Interruptedexception, executionexception {System.out.println ("main Thread begin: "); Executorservice executor = Executors.newcachedthreadpool (); listExecution Result:From the output it can be seen that we can only one block out. This will certainly waste a certain amount of time waiting. As 7 returned. But the previous 1-6 did not return. Then 7 will have to wait for 1-6 output to output.Then cha

: 0thread-1----Quantity to consume: 5;; Number of actual consumption: 5;; Number of warehouses remaining: 5;; How many items have not been consumed: 0thread-4----Quantity to consume: 15;; Number of actual consumption: 5;; Number of warehouses remaining: 0;; How many items have not been consumed: 10thread-2----to the number of storage: 15;; Number of physical storage: 15;; Warehouse Cargo Quantity: 15;; No storage quantity: 0thread-4----Quantity to consume: 15;; Number of actual consumption: 10;;

caller. The interruptedexception exception is thrown again. If an exception cannot be thrown, the interrupt method that invokes the thread resumes the interrupt, and the upper layer code sees that an interrupt was thrown. For example: Publicclasstaskrunnableimplementsrunnable{blockingqueue 5.5 Synchronization Tool ClassLatching: CountdownlatchFuturetask: Asynchronous EventSignal Volume: Counting semaphoreFence:Latching is used to wait for events, and fences are used to wait for processes. Fence

/** * * @author WEIP The counter count is thread safe (without a doubt, Atomiclong is command-level thread safe), * and the state of the counter is the state of the servlet. * */@ThreadSafepublic Class Countingfactorizer extends Genericservlet implements Servlet {Private final Atomiclong count = New Atomiclong (0);p ublic long GetCount () {return count.get ();} public void Service (ServletRequest req, Servletresponse resp) {BigInteger i = extractfromrequest (req); biginteger[] factors = factor (