java concurrency in practice amazon

Mainly talk about the performance of the lock and some other theoretical knowledge, the main source of the content is "Java Concurrency in Practice", combined with their own understanding and practical application of the lock mechanism to a small summary.One of the first things to emphasize is that all locks (including built-in locks and advanced locks) are perfo

Java Concurrency: Lock framework Detailed Summary: We already know that synchronized is the Java keyword, is the built-in features of Java, in the JVM level to achieve the synchronization of the critical resources of mutually exclusive access, but the synchronized granularity is somewhat large, in dealing with the act

downgrade, follow the acquisition of write lock, read lock and then release the order of the write lock, write lock can be downgraded to read lock. Locksupport provides a park unpark static method of blocking, waking. Condition Interface : Any Java object, has a set of monitor methods, including, wait() and notify() so on, these methods and synchronized keyword Mates can implement the wait/notification mode, the Condition interface also provides

In the daily Java code development process, it is inevitable to have multi-threaded requirements, mastering the Java multithreading and concurrency mechanism is the Java programmer to write more robust and efficient code base. I find the domestic published on the Java Multi-

cause thread context switching and scheduling.use optimization for volatileThe famous Java concurrency programmer, Doug Lea, adds a queue collection class LinkedTransferQueue in the concurrency package of JDK7, where he uses a volatile variable to optimize the team's performance by appending a byte.Additional word energy-saving optimized performance? This approa

In this summary, we focus on the principle and design idea of atomic operation.Because of the locking mechanism in the next section, the concept of locking is introduced appropriately in this section.In the Java Concurrency in practice, this defines thread-safe: When multiple threads access a class, the behavior of the class is still correct , without re

at the specified memory location of a variable. For example, in order to optimize a cyclic index variable, the compiler may choose to store it in a register, or the cache will be deferred to a more appropriate time before a new variable value is stored in main memory. All of these optimizations are designed to help achieve higher performance. The term "reordering" is used to describe several types of memory operations: When the compiler does not change the semantics of the program, as

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 synchroniza

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

Introduction: Active object is a typical design pattern in concurrent programming practice, and the core of active object mode is to improve the concurrency of programs by solving the invocation and execution of the coupling method. This paper begins with the typical active object design pattern and explores the application of the active object concurrency patter

precedes operation B, and Operation B precedes Operation C, it can be concluded that operation a precedes operation C Thread Start rule: the Start () method of the thread object takes precedence over each action of this thread Thread Break rule: The call to the thread interrupt () method occurs when the code of the interrupted thread detects that the interrupt event occurred Thread termination rule: All operations in a thread occur first in thread termination detection, and we can d

The concept of first contact deadlock is the "Philosopher's meal" as described in the principle of operating system in a university course. In the operating system, a deadlock problem may occur because each process shares system resources. In the same Java multithreaded environment, there are also deadlock problems caused by resource sharing. When a set of Java threads Deadlock, it is possible that the prog

() method, and if the non-blocking thread simply changes the interrupt state, the thread will continue to run down, but if it is in a unblocking thread, such as the execution of sleep (), wait (), join () The thread that waits for the method throws the interruptedexception exception because the interrupt state is set, and the program handles this exception capture.The three main points mentioned above, the first is the implementation of polling at which level, there is no special requirement, i

constraint failure, or other conditions that make a program unable to continue execution, since this is already an almost universally accepted practice, so it is best not to implement any new error subclasses, so All outstanding throw structures should be subclasses of the runtimeexception (direct or indirect) 59th: Avoid unnecessary use of the inspected exception Excessive use of the tested exception will make the API very inconvenient to use, if th

ObjectiveRecently time is more abundant, just looked again "the actual practice Java High concurrency Program design", therefore carries on the summary to the Java concurrency some knowledge, is warm therefore knows the new bar.One, Thread Foundation1, new ThreadThere are ge

obtained when a synchronization method on another object is accessed in a synchronous method.4, for synchronization, to be awake at all times on which object synchronization, this is the key.5, write thread-safe classes, you need to pay attention to multiple threads competing access to the logic and security of the resources to make the right judgment, the "atomic" operation to make an analysis, and ensure that other threads during atomic operation can not access the competing resources.6. When

the basis of Map.entry added Before/after two two-way index, used to connect all the Map.entry, so you can traverse or do the LRU cache and so on. There is no longer a discussion here.memcached internal data structure is the use of hashmap similar ideas to achieve, interested can be reference 8,9,10.In order not to make this article too long, so put the principle of concurrenthashmap in the next chapter. It is necessary to note that, although the name of Concurrenthashmap and HashMap some sourc

Java Theory and Practice: Dynamic compilation and performance measurement Java Theory and Practice: concurrency to some extent makes everything easier Java Theory and Practice: Conc

recycling of objects in multi-threaded environments is very difficult, the Java Runtime Environment of garbage collection (garbage COLLECTION,GC) function to alleviate the burden of programmers.ReferenceJava 1.6 Apidocs thread,http://tool.oschina.net/uploads/apidocs/jdk-zh/java/lang/thread.htmlJava Concurrency in practice