Java 7 Concurrency Cookbook

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It is a book I will recommend for in-experienced or less experienced Java developers. I was expecting a deeper dive as it is not a full java reference book but is just focused on topic of concurrency. Jan 23, Geri Lamble rated it it was amazing. This book provides a direct hands-on introduction to multithreaded programming in Java 7. Oct 13, Yury Antonov rated it it was ok Shelves: concurrency , java , jvm , own-ebook. Too simple, just some trivial introductory recipes. Before reading JCIP, maybe but May 06, Alexander Ryabov rated it really liked it.

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Good book for the beginners. It has only one problem from my point of view. Each one code sample is separated on several pieces and it's makes code less readable. Bartek rated it really liked it Sep 20, Faycal Sabbane rated it really liked it Nov 24, Davit Mumladze rated it really liked it Jan 07, Ilgar rated it it was ok Aug 08, Xd Du rated it liked it Apr 24, Kinzlp rated it liked it Apr 19, Azza Hawary rated it it was amazing Nov 30, Mykhailo Kozik rated it liked it Oct 25, Vern rated it liked it Oct 13, Krishna Kumar rated it it was ok May 01, M rated it liked it Jun 18, Andrew rated it liked it Nov 26, Ivan Fedorov marked it as to-read Oct 24, Andy Legkiy marked it as to-read Dec 04, Dan Woolloff marked it as to-read Dec 20, Shahab Ashraf marked it as to-read Jan 24, Filip Tepper marked it as to-read Jan 31, Kuba Modzelewski marked it as to-read Feb 18, Andre marked it as to-read Apr 19, Michael Fok added it Apr 21, Sven Meys added it May 10, Ben added it May 27, Deepak marked it as to-read Jul 22, Keshav Paliwal marked it as to-read Jul 26, Gill added it Jan 23, Enkidu marked it as to-read Feb 06, Henry Suryawirawan marked it as to-read Feb 10, Vijay Addhankki marked it as to-read Mar 08, Kamau is currently reading it Mar 24, Satish Singh marked it as to-read May 01, Ivan Nikolaev marked it as to-read Jun 18, Sumit Kumar is currently reading it Dec 20, Steven R.

Gabriel Guernik added it Feb 14, Ersin Ertan marked it as to-read Apr 24, Lee Jonas marked it as to-read May 22, Jaunius marked it as to-read Jun 04, Y marked it as to-read Jun 26, Karunakar marked it as to-read Aug 17, The Thread class saves some information attributes that can help us to identify a thread. These attributes are:. A Java program with more than one execution thread only finishes when the execution of all of its threads end. Java provides the interruption mechanism to indicate to a thread that we want to finish it.

Thread has to check if it has been interrupted or not, and it can decide if it responds to the finalization request or not. Thread can ignore it adn continue with its execution. The Thread class has an attribute that stores a boolean value indicating whether that thread has been interrupted or not. When you call the interrupt method of a thread, you set that attribute to true. The isInterrupted method only returns the value of that attribute.

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You can throw InterruptedException when you detect the interruption of the thread and catch it in the run method. Sometimes, the thread does nothing. During this time, the thread doesn't use any resources of the computer.

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After this time, the thread will be ready to continue with its execution when the JVM chooses it to be executed. You can use the sleep method of the Thread class for this purpose. Another possibility is to use the sleep method of an element of the TimeUnit enumeration. This method uses the sleep method of the Thread classes to put the current thread to sleep, but it receives the parameter in the unit that it represents and converts it to milliseconds.

When you call the sleep method, Thread leaves the CPU and stops its execution for a period of time. When Thread is sleeping and is interrupted, the method throws an InterruptedException immediately and doesn't wait until the sleeping time finishes. We may have a program that will begin initializing the resources it needs before proceeding with the rest of the execution. We can run the initializaion tasks as threads and wait for its finialization before continuing with the rest of the program. For this purpose, we can use the join method of the Thread class.

When we call this method using a thread object, it suspends the execution of the calling thread until the object called finishes its execution. Instead of waiting indefinitely for the finalization of the thread called, the calling thread waits for the milliseconds specified as a parameter of the method. For example, if the object thread1 has the code, thread2.

Deamon thread: has very low priority and normally only executes when no other thread of the same program is running. When daemon threads are the only threads running in a program, the JVM ends the program finishing thses thread. They can't do important jobs because we don't know when they are going to have CPU time and they can finish any time if there aren't any other threads running.


A typical example of these kind of threads is the Java garbage collector. You only can call the setDaemon method before you call the start method. Once the thread is running, you can't modify its daemon status. When a checked exception is thrown inside the run method of a Thread object, we have to catch and treat them, because the run method doesn't accept a throws clause.

When an unchecked exception is thrown inside the run method of a Thread object, the default behavior is to write the stack trace in the console and exit the program. When an exception is thrown in a thread and is not caught, the JVM checks if the thread has an uncaught execption handler set by the corresponding method. If the thread has not got an uncaught exception handler, the JVM prints the statck trace in the console and exits the program. If you create an object of a class that implements the Runnable interface and then start various Thread objects using the same Runnable object, all the threads share the same attributes.

This meanns that, if you change an attribute in a thread, all the threads will be affected by this change. Thread-local variables: sometimes, you will be interested in having an attribute that won't be shared between all the threads that run the same object.

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  4. Thread-local variables store a value of an attribute for each Thread that uses one of these variables. You can read the value using the get method and changes the value using the set method. The first time you access the value of a thread-local variable, if it has no value for the Thread object that it is calling, the thread-local variable calls the initialValue method to assign a value for that Thread and returns the inital value. The thread-local class provides the remove method that deletes the value stored in the thread-local variable for the thread that it's calling.

    If a thread A has a value in a thread-local variable and it creates another thread B, the thread B will have the same value as the thread A in the thread-local varaible. You can override the childValue method that is called to initalize the value of the child thread in the thread-local variable.

    For example, you have some threads doing the same task and you want to control them, irrespective of how many threads are still running, the status of each one will interrupt all of them with a single call. Java provides the ThreadGroup class to work with groups of threads. A ThreadGroup object can be formed by Thread objects and by another ThreadGroup object, generating a tree structure of threads. Java implements an exception-based mechanism to manage error situations. Those exceptions are thrown by the Java classes when an error situation is detected. Java also provides a mechanism to capture and process those exceptions.

    There are exceptions that must be captured or re-thrown using the throws clause of a method. These exceptions are called checked exceptions. Those not are unchecked exceptions. When an uncaught exception is thrown in Thread, the JVM looks for three possible handlers for this exception. The ThreadFactory interface has only one methods called newThread.

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    Most basic ThreadFactory has only one line:. Thread Synchronization Utilities We talk about synchronization when more than one concurrent task shares a resource. The blocks of code that access this shared resource are called critical sections. The high-level mechanisms are: Semaphores : A semaphore is a counter that controls the access to one or more shared resources. CountDownLatch : The CountDowLatch class is a mechanism provided by the Java language that allows a thread to wait for the finalization of multiple operations.

    CyclicBarrier : The CyclicBarrier class is another mechanism provided by the Java language that allows the synchronization of multiple threads in a common point. Phaser : The Phaser class is another mechanism provided by the Java language that controls the execution of concurrent tasks divided in phases. All the threads must finish one phase before they can continue with the next one.

    Thread Synchronization Utilities

    Exchanger : The Exchanger class is another mechanism provided by the Java language that provides a point of data interchange between two threads. Controlling concurrent access to a resource A semaphore is a counter taht protects the access to one or more shared resources. Fairness in semaphores The default mode is called the non-fair mode.

    Controlling concurrent access to multiple copies of a resource. Basic Thread Synchronization Introduction In a concurrent application, it is normal that multiple threads read or write the same data or have access to the same file or database connection. The solution for these problems comes with the concept of critical section. Synchronizing a method the use of the synchronized keyword to control the concurrent access to a method.

    Using conditions in synchronized code A classic problem in concurrent programming is the producer-consumer problem. Synchronizing a block of code with a Lock based on the Lock interface and classes that implement it as ReentrantLock. This mechanism presents some advantages, which are as follows: It allows the structuring of synchronized blocks in a more flexible way.

    With the synchronized keyword, you have to get and free the control over a synchronized block of code in a structured way. The Lock interfaces allow you to get more complex structures to implement your ciritical section. The Lock interfaces provide additional functionalities over the synchronized keyword. One of the new functionalities is implemented by the tryLock method. With the synchronized keyword, when a threadA tries to execute a synchronized block of code, if there is another threadB executing it, the threadA is suspended until the threadB finishes the execution of the synchronized block.

    With locks, you can execute the tryLock method. This meothod returns a Boolean value indicating if there is another thread running the code protected by this lock. The Lock interfaces allow a separation of read and write operations having multiple readers and only one modifier. The Lock interfaces offer better performance than the synchronized keyword.

    Modifying Lock fairness The constructor of the ReentrantLock and ReentrantReadWriteLock classes admits a boolean parameter named fair that allows you to control the behavior of both classes. Using multiple conditions in a Lock A lock may be associated with one or more conditions. Thread Management Introduction Inside a process, we can have various simultaneous tasks.

    When you call the start method of a Thread object, we are creating another execution thread. Getting and setting thread information The Thread class saves some information attributes that can help us to identify a thread. These attributes are: ID: stores a unique identifier for each Thread Name: stores the name of the Thread Priority: stores the priority of the Thread object. Threads can have a priority between 1 and 10, where 1 is the lowest. Status: stores the status of Thread.

    Java 7 Concurrency Cookbook Java 7 Concurrency Cookbook
    Java 7 Concurrency Cookbook Java 7 Concurrency Cookbook
    Java 7 Concurrency Cookbook Java 7 Concurrency Cookbook
    Java 7 Concurrency Cookbook Java 7 Concurrency Cookbook
    Java 7 Concurrency Cookbook Java 7 Concurrency Cookbook
    Java 7 Concurrency Cookbook Java 7 Concurrency Cookbook
    Java 7 Concurrency Cookbook Java 7 Concurrency Cookbook

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