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Deep understanding of Java concurrency--"Java Concurrency in Practice" 13. Explicit lock __java

read operations, or by a write operation, but both cannot be performed concurrently. Read-write locks are a performance optimization measure that enables higher concurrency in certain situations. In practice, read-write locks can improve performance for data structures that are frequently read on multiprocessor systems. In other cases, the performance of the read-write lock is slightly worse than the perfo

[Practical Java high concurrency programming design 4] Arrays can also be unlocked: AtomicIntegerArray, java concurrent programming practice pdf

[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 arrays include AtomicIntegerArray, AtomicLongAr

Java Concurrency: Distributed application current limit Redis + Lua Practice

failed; Nested exception is java.lang.RuntimeException: has been to set current limit times] with root causejava.lang.RuntimeException: already to set current limit times at COM. Souyunku.example.config.LimitAspect.interceptor ( ~[classes/:na] at Sun.reflect.GeneratedMethodAccessor35.invoke (Unknown Source) ~[na:na] at Sun.reflect.DelegatingMethodAccessorImpl.invoke ( ~[na:1.8.0_112] at Java.lang.reflect.Method.invoke ( ~[

Java Theory and Practice: concurrency Simplifies everything to a certain extent

only need to write some packages that can achieve our goal, we will adjust it based on our specific needs ". However, it is often because you have quickly extended the compiled simple tool and tried to add more features until you compile a complete infrastructure service. At this point, you usually stick to the program you write, whether it is good or bad. You have already paid all the cost for building your own program, so in addition to the actual migration cost invested by the general implem

"Java Concurrency Programming Practice" Digest

. volatilevariables are not cached in registers or in places that are not visible to other processors, so the volatile most recently written value is always returned when a variable of type is read.volatileYou should use variables only if they simplify the implementation of your code and validate your synchronization policies. If you need to make complex judgments about visibility when validating correctness, do not use volatile variables. volatilethe correct use of variables includes:

Combination of objects in Java concurrency programming practice

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,

Java Concurrency in practice 4.1-4.2 related issues and understanding

Today finally again picked up the Java Concurrency in practice, before the abuse of the pieces, before reading this book, there is a part of their own code I did not realize that the thread is not safe, but also really want to be bad to fill this knowledge.1.Java Monitor ModeMonitor mode is very simple, is to use a pri

Read Java concurrency Programming practice, adding functionality to a thread-safe class-Client Lock Implementation Example

In the Java Concurrency Programming practice, 4.4 mentions the method of locking the client. This is a validation example, but it is not good to write, but you can see the result. Packagecom.blackbread.test;Importjava.util.ArrayList;Importjava.util.Collections;Importjava.util.List;ImportJava.util.concurrent.ExecutorService;Importjava.util.concurrent.Executors; Pu

[Java Concurrency in practice] Chapter II thread safety

to be met, simplicity, and performance. There is often a mutual constraint between simplicity and performance. When implementing a synchronization strategy, be sure not to blindly sacrifice simplicity for performance (which could compromise security). When using a lock, you should be aware of the functionality implemented in the code block and whether it will take a long time to execute the code block. Whether you are performing a computationally intensive operation or performing

Java Concurrency Basics Practice: Quitting task I

Plan to write a "Java Concurrent basic Practice" series, counted as my Java concurrency Learning and practice of a simple summary. This is the first of the series that describes the easiest way to quit a concurrent task. After a concurrent task is started, do not expect it

Java Threading and concurrency programming Practice----synchronizer (countdown latch)

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

NOTES: Java Concurrency programming Practice 1

is compared, if the same, it means that there has not been a write operation, the result of the original traversal is returned, if not the same, the process is repeated again, if not the same, It is necessary to lock all the segment and then one through. Public intsize () {//Try a few times to get accurate count. On failure due to//continuous async changes in table, resort to locking. FinalSegment This. Segments; intsize; BooleanOverflow//true if size overflows LongSum//Sum of mo

Java Concurrency Programming Practice Note-happens-before rules

. If operation A is performed before action B and action B is performed before Operation C, then operation a must be performed before Operation C.The following is an English description of happens-before,the Happens-before relation defines when data races take place. An unlock in a monitor happens-before every subsequent lock on the that monitor. A write to a volatile field happens-before every subsequent read of the that field. A call to start () on a thre

NOTES: Java Concurrency Practice 2

EXEC2 =NewWithinthreadexecutor (); Public Static voidMain (string[] args)throwsIOException {serversocket socket=NewServerSocket (80); while(true) { FinalSocket connection =socket.accept (); Runnable Task=NewRunnable () { Public voidrun () {//HandleRequest (connection); } }; Exec.execute (Task); } }}classThreadpertaskexecutorImplementsExecutor { Public voidExecute (Runnable r) {NewThread (R). Start (); };}classWithinthreadexecutorImplementsExecuto

Java Concurrency Programming Practice reading Notes (3) Task execution

Similar to the multi-tasking scenario of a Web server, it is not possible to use only one thread to provide services externally. This way, efficiency and throughput are too low.However, it is not possible to create a thread with a single request because the cost of creating the thread is very high and the number of threads that the system can create is limited.So the executor appeared.The meaning of executor frame thread poolThread creation too little wasted server resources, in addition to the

Go language Construction Tens online high-concurrency message push system practice (from 360 companies)

This is a creation in Article, where the information may have evolved or changed. 1. The penetration rate of go language is more and more high, while everyone's attention to the combat experience of go language is more and more high. The go language is very suitable for distributed systems with high concurrency, complex communication interaction and heavy business logic, and has the advantages of good development experience, stable service at a certa

Java concurrency primitive-thread, mutex and synchronization, java concurrency primitive mutex

may lead to a slowdown in most conditional variable operations. " To prevent false wakeup, you need to check whether a condition is fulfilled after wait returns. All conditions on the wait end are written as while instead of if. in Java, the conditions are usually: // Waiting thread: synchronized (cond) {while (! Done) {cond. wait () ;}// wake up thread: dosomething (); synchronized (cond) {done = true; cond. Y ();} Summary In the In addition, it

"Java Concurrency Programming" 20: Concurrency new attribute-lock lock and condition variable (including code) __reentrantlock

= 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

In layman's Java Concurrency (38): Concurrent Summary Part 2 common concurrency scenarios [go]

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

In layman's Java Concurrency (36): Thread pool Part 9 concurrency Operation exception System [GO]

and the tool class introduced by the contract many methods throw a certain exception that describes the exceptions that occur when the task is executed in the thread pool, and usually these exceptions require the application to capture and process.For example, the following API is available in the future interface:Java.util.concurrent.Future.get (Long, timeunit) throws Interruptedexception, Executionexception, timeoutexception;The specific implementation principles of the future class are descri

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