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Home > Programming > Concurrency > Java 9 Concurrency Cookbook, Second Edition
Java 9 Concurrency Cookbook, Second Edition
Java 9 Concurrency Cookbook, Second Edition

Java 9 Concurrency Cookbook, Second Edition: Build highly scalable, robust, and concurrent applications , Second Edition

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Java 9 Concurrency Cookbook, Second Edition

Basic Thread Synchronization

In this chapter, we will cover the following topics:

  • Synchronizing a method
  • Using conditions in synchronized code
  • Synchronizing a block of code with a lock
  • Synchronizing data access with read/write locks
  • Using multiple conditions in a lock
  • Advanced locking with the StampedLock class

Introduction

One of the most common situations in concurrent programming occurs when more than one execution thread shares a resource. In a concurrent application, it is normal for multiple threads to read or write the same data structure or have access to the same file or database connection. These shared resources can provoke error situations or data inconsistency, and we have to implement mechanisms to avoid these errors. These situations are called race conditions and they occur when different threads have access to the same shared resource at the same time. Therefore, the final result depends on the order of the execution of threads, and most of the time, it is incorrect. You can also have problems with change visibility. So if a thread changes the value of a shared variable, the changes would only be written in the local cache of that thread; other threads will not have access to the change (they will only...

Synchronizing a method

In this recipe, you will learn how to use one of the most basic methods of synchronization in Java, that is, the use of the synchronized keyword to control concurrent access to a method or a block of code. All the synchronized sentences (used on methods or blocks of code) use an object reference. Only one thread can execute a method or block of code protected by the same object reference.

When you use the synchronized keyword with a method, the object reference is implicit. When you use the synchronized keyword in one or more methods of an object, only one execution thread will have access to all these methods. If another thread tries to access any method declared with the synchronized keyword of the same object, it will be suspended until the first thread finishes the execution of the method. In other words, every method declared with the synchronized keyword is a critical section, and Java...

Using conditions in synchronized code

A classic problem in concurrent programming is the producer-consumer problem. We have a data buffer, one or more producers of data that save it in the buffer, and one or more consumers of data that take it from the buffer.

As the buffer is a shared data structure, we have to control access to it using a synchronization mechanism, such as the synchronized keyword, but here we have more limitations. A producer can't save data in the buffer if it's full, and a consumer can't take data from the buffer if it's empty.

For these types of situations, Java provides the wait(), notify(), and notifyAll() methods implemented in the Object class. A thread can call the wait() method inside a synchronized block of code. If it calls the wait() method outside a synchronized block of code, JVM throws an IllegalMonitorStateException exception. When the thread calls the wait...

Synchronizing a block of code with a lock

Java provides another mechanism for synchronizing blocks of code. It's a more powerful and flexible mechanism than the synchronized keyword. It's based on the Lock (of the java.util.concurrent.locks package) interface and classes that implement it (as ReentrantLock). This mechanism presents some advantages, which are as follows:

  • It allows you to structure synchronized blocks in a more flexible way. With the synchronized keyword, you only have control over a synchronized block of code in a structured way. However, the Lock interface allows you to get more complex structures to implement your critical section.
  • The Lock interface provides additional functionalities over the synchronized keyword. One of the new functionalities is implemented by the tryLock() method. This method tries to get control of the lock, and if it can't, because it's used by another...

Synchronizing data access with read/write locks

One of the most significant improvements offered by locks is the ReadWriteLock interface and the ReentrantReadWriteLock class, the unique class that implements that interface. This class has two locks: one for read operations and one for write operations. There can be more than one thread using read operations simultaneously, but only one thread can use write operations. If a thread is doing a write operation, other threads can't write or read.

In this recipe, you will learn how to use a ReadWriteLock interface by implementing a program that uses it to control access to an object that stores the prices of two products.

Getting ready...

You should read the Synchronizing a block of code with a lock recipe to better...

Using multiple conditions in a lock

A lock may be associated with one or more conditions. These conditions are declared in the Condition interface. The purpose of these conditions is to allow threads to have control of a lock and check whether a condition is true or not. If it's false, the thread will be suspended until another thread wakes it up. The Condition interface provides the mechanisms to suspend a thread and wake up a suspended thread.

A classic problem in concurrent programming is the producer-consumer problem. We have a data buffer, one or more producers of data that save it in the buffer, and one or more consumers of data that take it from the buffer, as explained earlier in this chapter.

In this recipe, you will learn how to implement the producer-consumer problem using locks and conditions.

...

Advanced locking with the StampedLock class

The StampedLock class provides a special kind of lock that is different from the ones provided by the Lock or ReadWriteLock interfaces. In fact, this class doesn't implement these interfaces, but the functionality it provides is very similar.

The first point to note about this kind of lock is that its main purpose is to be a helper class to implement thread-safe components, so its use will not be very common in normal applications.

The most important features of StampedLock locks are as follows:

  • You can obtain control of the lock in three different modes:
    • Write: In this mode, you get exclusive access to the lock. No other thread can have control of the lock in this mode.
    • Read: In this mode, you have non-exclusive access to the lock. There can be other threads that have access to the lock in this mode or the Optimistic Read mode.
    • Optimistic Read: Here, the thread...
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Key benefits

  • Get detailed coverage of important recipes on multi-threading and parallel programming
  • This book takes a close look at the Java 9 APIs and their impact on concurrency
  • See practical examples on thread safety, high-performance classes, safe sharing, and a whole lot more

Description

Writing concurrent and parallel programming applications is an integral skill for any Java programmer. Java 9 comes with a host of fantastic features, including significant performance improvements and new APIs. This book will take you through all the new APIs, showing you how to build parallel and multi-threaded applications. The book covers all the elements of the Java Concurrency API, with essential recipes that will help you take advantage of the exciting new capabilities. You will learn how to use parallel and reactive streams to process massive data sets. Next, you will move on to create streams and use all their intermediate and terminal operations to process big collections of data in a parallel and functional way. Further, you’ll discover a whole range of recipes for almost everything, such as thread management, synchronization, executors, parallel and reactive streams, and many more. At the end of the book, you will learn how to obtain information about the status of some of the most useful components of the Java Concurrency API and how to test concurrent applications using different tools.

Who is this book for?

The book is for Java developers and programmers at an intermediate to advanced level. It will be especially useful for developers who want to take advantage of task-based recipes using Java 9’s concurrent API to program thread-safe solutions.

What you will learn

  • Find out to manage the basic components of the Java Concurrency API
  • Use synchronization mechanisms to avoid data race conditions and other problems of concurrent applications
  • Separate the thread management from the rest of the application with the Executor framework
  • Solve problems using a parallelized version of the divide and conquer paradigm with the Fork / Join framework
  • Process massive data sets in an optimized way using streams and reactive streams
  • See which data structures we can use in concurrent applications and how to use them
  • Practice efficient techniques to test concurrent applications
  • Get to know tips and tricks to design concurrent applications
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Publication date : Apr 25, 2017
Length: 594 pages
Edition : 2nd
Language : English
ISBN-13 : 9781787124417
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Concepts :
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Publication date : Apr 25, 2017
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Language : English
ISBN-13 : 9781787124417
Vendor :
Oracle
Category :
Programming
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Concepts :
Concurrency

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Table of Contents

11 Chapters
Thread Management Chevron down icon Chevron up icon
Thread Management
Introduction
Creating, running, and setting the characteristics of a thread
Interrupting a thread
Controlling the interruption of a thread
Sleeping and resuming a thread
Waiting for the finalization of a thread
Creating and running a daemon thread
Processing uncontrolled exceptions in a thread
Using thread local variables
Grouping threads and processing uncontrolled exceptions in a group of threads
Creating threads through a factory
Basic Thread Synchronization Chevron down icon Chevron up icon
Basic Thread Synchronization
Introduction
Synchronizing a method
Using conditions in synchronized code
Synchronizing a block of code with a lock
Synchronizing data access with read/write locks
Using multiple conditions in a lock
Advanced locking with the StampedLock class
Thread Synchronization Utilities Chevron down icon Chevron up icon
Thread Synchronization Utilities
Introduction
Controlling concurrent access to one or more copies of a resource
Waiting for multiple concurrent events
Synchronizing tasks in a common point
Running concurrent-phased tasks
Controlling phase change in concurrent-phased tasks
Exchanging data between concurrent tasks
Completing and linking tasks asynchronously
Thread Executors Chevron down icon Chevron up icon
Thread Executors
Introduction
Creating a thread executor and controlling its rejected tasks
Executing tasks in an executor that returns a result
Running multiple tasks and processing the first result
Running multiple tasks and processing all the results
Running a task in an executor after a delay
Running a task in an executor periodically
Canceling a task in an executor
Controlling a task finishing in an executor
Separating the launching of tasks and the processing of their results in an executor
Fork/Join Framework Chevron down icon Chevron up icon
Fork/Join Framework
Introduction
Creating a fork/join pool
Joining the results of the tasks
Running tasks asynchronously
Throwing exceptions in the tasks
Canceling a task
Parallel and Reactive Streams Chevron down icon Chevron up icon
Parallel and Reactive Streams
Introduction
Creating streams from different sources
Reducing the elements of a stream
Collecting the elements of a stream
Applying an action to every element of a stream
Filtering the elements of a stream
Transforming the elements of a stream
Sorting the elements of a stream
Verifying conditions in the elements of a stream
Reactive programming with reactive streams
Concurrent Collections Chevron down icon Chevron up icon
Concurrent Collections
Introduction
Using non-blocking thread-safe deques
Using blocking thread-safe deques
Using blocking thread-safe queue ordered by priority
Using thread-safe lists with delayed elements
Using thread-safe navigable maps
Using thread-safe HashMaps
Using atomic variables
Using atomic arrays
Using the volatile keyword
Using variable handles
Customizing Concurrency Classes Chevron down icon Chevron up icon
Customizing Concurrency Classes
Introduction
Customizing the ThreadPoolExecutor class
Implementing a priority-based Executor class
Implementing the ThreadFactory interface to generate custom threads
Using our ThreadFactory in an Executor object
Customizing tasks running in a scheduled thread pool
Implementing the ThreadFactory interface to generate custom threads for the fork/join framework
Customizing tasks running in the fork/join framework
Implementing a custom Lock class
Implementing a transfer queue-based on priorities
Implementing your own atomic object
Implementing your own stream generator
Implementing your own asynchronous stream
Testing Concurrent Applications Chevron down icon Chevron up icon
Testing Concurrent Applications
Introduction
Monitoring a Lock interface
Monitoring a Phaser class
Monitoring an Executor framework
Monitoring a fork/join pool
Monitoring a stream
Writing effective log messages
Analyzing concurrent code with FindBugs
Configuring Eclipse for debugging concurrency code
Configuring NetBeans for debugging concurrency code
Testing concurrency code with MultithreadedTC
Monitoring with JConsole
Additional Information Chevron down icon Chevron up icon
Additional Information
Introduction
Processing results for Runnable objects in the Executor framework
Processing uncontrolled exceptions in a ForkJoinPool class
Using a blocking thread-safe queue for communicating with producers and consumers
Monitoring a Thread class
Monitoring a Semaphore class
Generating concurrent random numbers
Concurrent Programming Design Chevron down icon Chevron up icon
Concurrent Programming Design
Introduction
Using immutable objects when possible
Avoiding deadlocks by ordering locks
Using atomic variables instead of synchronization
Holding locks for as short time as possible
Delegating the management of threads to executors
Using concurrent data structures instead of programming yourself
Taking precautions using lazy initialization
Using the fork/join framework instead of executors
Avoiding the use of blocking operations inside a lock
Avoiding the use of deprecated methods
Using executors instead of thread groups
Using streams to process big data sets
Other tips and tricks

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Just reading. The concept of concurrency in terms of lambda expressions is well explained in this book. The quality of papers and printing is excellent.
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About the author

Profile icon Javier Fernández González
Javier Fernández González
Javier Fernandez is a software architect with almost 15 years experience with Java technologies. He has worked as a teacher, researcher, programmer, analyst, writer and now as an architect in all types of projects related to Java, especially J2EE. As a teacher, has taught over 1000 hours of training in basic Java, J2EE and Struts framework. As a researcher, has worked in the field of information retrieval developing applications for processing large amounts of data in Java and has participated as co-author on several journal articles and conference presentations. In recent years, has worked on developing J2EE web applications for various clients from different sectors (public administration, insurance, healthcare, transportation, ...). Currently he works as a software architect at Capgemini developing and maintaining applications for an insurance company. He is the author of the book Java 7 Concurrency Cookbook.
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What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela