mastering concurrency programming with java 8

++) { //Add the specified element to this blocking stack Bdeque.putfirst ("" + i); System.out.println ("added elements to the blocking stack:" + i); } SYSTEM.OUT.PRINTLN ("program to this run end, will exit----"); } } The results of the implementation are as follows:The program will still block the wait, let's change to the following code:[Java]View PlainCopy Import Java.util.concurrent.BlockingDeque; Import Java.util.concur

192.10.10.10 are two IPs bound to the native NIC, while 192.168.83.1 and 192.168.189.1 are the addresses of the two virtual network cards that the VMware virtual machine software installs natively. The last IPV6 address 0:0:0:0:0:0:0:1 is the IPv6 URL representing the native, equivalent to the IPV4 address of 127.0.0.1. Readers can add IPv6 addresses and delete IPv6 using the following command line:Add IPV6 Addressnetsh interface ipv6 add address "Local Area Connection" AA:BB::CCDelete IPv6nets

thrown when the domain name is incorrect. The following statement throws a Unknownhostexception exception:Socket SOCKET1 = new socket ("www.ptpress123.com.cn", 80); public class Protocolexception extends IOException This exception is not often thrown. For unknown reasons, TCP/IP packets are corrupted, and a Protocolexception exception is thrown. public class Sockettimeoutexception extends Interruptedioexception If the server still does not respond after the connectio

the close method of the socket class is not called. You can continue to send HTTP requests to the server. when the HTML contains other Web resources, the browser can use the same network connection to download these resources, which can greatly reduce the pressure on the server. Figure 2 illustrates this process.Figure 2 Communication process for the HTTP1.1 protocolIn addition to supporting persistent connections , the HTTP1.1 extends the HTTP1.0 request method from the original three (get, PO

Socket programming practices in Linux (8) Select restrictions and poll (preliminary knowledge of concurrency)Select restrictions The number of concurrent servers implemented by the select statement is generally restricted by the following two factors: 1) Maximum file descriptor limit that a process can open. This can be changed by adjusting the kernel parameters.

from address a(2) Multi-step calculation at x(3) Use CAs to change the a value from X to Y. When doing this, CAs succeeds if the value of a does not change.Where is the CAs in the end?Package Xiancheng;public class ID {private static volatile long NextID = 1;static synchronized Long Getnextid () {return NE xtid++;}}The above code uses synchronized, and a listening lock in a high-contention environment can cause excessive context switching, which prevents all threadsand cause the application to

typically returns a more friendly name, such as Realtek RTL8139 Family PCI Fast Ethernet NIC. The GetDisplayName method is defined as follows:Public String GetDisplayName ()3. Getinetaddresses MethodThe NetworkInterface class can return all IP addresses that are bound to the network interface in the form of InetAddress objects through the Getinetaddresse method. The Getinetaddresses method is defined as follows:Public enumerationThe above code demonstrates the use of the above three getter meth

Java high concurrency programming (III), java concurrent programmingDirectory: 1. Several implementation methods of thread security Singleton Mode 2. Synchronize containers 3. Concurrent containersI. Several implementation methods of thread security Singleton Mode 1. Hungry Chinese style (synchronization lock is not us

own policy, and they can also interact with each other by interacting between the threads. It's hard to use a single thread to implement a 5-hero strategy.The drawbacks of concurrency　　Writing concurrent code is prone to error, and multithreading concurrency can cause a lot of uncertainty in execution, because only the same thread's internal code execution order is fixed, and the order of code execution be

.gethostname ()); system.out.println (" Time:"+ string.valueof (System.currenttimemillis ()-time) + "MS");System.out.println ("ADDRESS3:" + ADDRESS3); Simultaneous output domain name and IP address} }Operation Result:Native name: ComputerName directly get domain name: www.oracle.com time: 0 ms ADDRESS3:/141.146.8.66 lookup domain name through DNS: bigip-otn-portal.oracle.com elapsed time: 92 Ms address3:bigip-otn-portal.oracle.com/141.146.8.66As you can see from the running results above, the f

[Practical Java high concurrency programming design 4] Arrays can also be unlocked: AtomicIntegerArray, java concurrent programming practice pdf In addition to providing basic data types, JDK also prepares arrays and other composite structures for us. The available atomic ar

Transferred from: http://www.importnew.com/11345.htmlI just like the fresh stuff, and Java 8 has a lot of new things. This time I want to discuss one of my favorites: the Concurrency adder. This is a new collection of classes that they use to manage the counters that are read and written by multithreading . This new API, while significantly improving performance

Java Concurrency Programming: the use of auxiliary classes under the concurrent packageOrganized by: Blog Park-Haizi-http://www.cnblogs.com/dolphin0520/p/3920397.html1. Countdownlatch Usage:The thread that calls await () waits until count reaches 0, and count cannot be reused.1.1. Construction and Method:Countdownlatch (intView Code1.2. Example:2. Cyclicbarrier U

Java concurrent programming and java concurrency This article records the immutability of the policy to ensure concurrency security. (Note: It is Immutable, not Invariant !) Organizes a series of actions into an atomic operation to ensure immutability conditions, or uses a

Java concurrent programming and java concurrency The reason why Latch and Barrier are put together is that they give people a similar feeling.They all block some behaviors until an event occurs, but Latch is waiting for an event, while Barrier is waiting for the thread. First, compare the descriptions of the two in JCI

wastes a lot of testing work, because most of the time is always doing unnecessary testing. But Delayqueue can avoid this kind of unnecessary detection. This queue implementation is also discussed in more detail in the Scheduled Tasks section of the online pool.Below is a section on common Blockingqueue, which does not include a two-way queue, although concurrentlinkedqueue is not a blocking queue, but it is also used to compare it together.If you do not need to block queues, prioritize concurr

lock requires all read locks to be freed, a deadlock occurs if there are two read lock views that acquire a write lock without releasing the read lock. Lock get Interrupt Both the read lock and the write lock support the acquisition lock during the outage. This is consistent with the exclusive lock. Condition variable The write lock provides support for the conditional variable (Condition), which is consistent with the exclusive lock, but the read lock do

1. Whether a node is the park () is the key, which is determined by the method Java.util.concurrent.locks.AbstractQueuedSynchronizer.shouldParkAfterFailedAcquire (node, Node) is implemented. Private static Boolean Shouldparkafterfailedacquire (node pred, node node) { int s = Pred.waitstatus; if (S if (S > 0) { do { Node.prev = pred = Pred.prev; } while (Pred.waitstatus > 0); pred.next = node; } else compareandsetwaitstatus (pred, 0, node.signal); return false;

releasing the read lock. Lock get Interrupt Both the read lock and the write lock support the acquisition lock during the outage. This is consistent with the exclusive lock. Condition variable The write lock provides support for the conditional variable (Condition), which is consistent with the exclusive lock, but the read lock does not allow the conditional variable to get an UnsupportedOperationException exception. Re-entry number Th

One, concurrent programming Challenge 1, Context switch (1) Issues with context switching Providing strong parallelism on the processor makes it possible to program concurrency. The processor realizes the illusion of program parallelism by assigning different time slices to different threads for automatic scheduling and switching of thread execution. In a single thread: Threads save serial ex