Java-7 Concurrency

Java-7 Concurrency

• 1.
  Masudul Haque
• 2.
  Process-based multitasking • Allowsyou to run the Java Compiler at the same time that you are using an editor Thread-based multitasking • A text editor can format text at the same time that it is printing
• 3.
    Implement Runnable interface SubclassThread class
• 5.
   Thread execution ◦ start()– Start a thread by calling its run() method ◦ run() – Entry point for the thread  Thread blocking ◦ sleep() – Suspend a thread for a period of time ◦ yield() – Voluntarily relinquish thread control to another thread of the same priority
• 6.
   Thread lifetime andtermination ◦ isAlive() – Determine if a thread is still running ◦ join() – Wait for a thread to terminate  Thread communication ◦ wait() – Instructs the calling thread to give up the monitor and sleep until some other thread enters the same monitor and calls notify() ◦ notify() – Wakes up a thread that called wait() on the same object ◦ notifyAll() – Wakes up all threads that called wait() on the same object
• 7.
    A concurrent application'sability to execute in a timely manner is known as its liveness Deadlock describes a situation where two or more threads are blocked forever ◦ Starvation describes a situation where a thread is unable to gain regular access to shared resources ◦ A thread often acts in response to the action of another thread. If the other thread's action is also a response to the action of another thread, then livelock may result.
• 8.
    Thread interference Memory ConsistencyError
• 9.
  java.util.concurrent • Concurrency APIs java.util.concurrent.atomic •Atomic data types java.util.concurrent.locks • Locks for synchronization
• 10.
  Semaphore • Implements theclassic semaphore CountDownLatch • Waits until a specified number of events have occurred CyclicBarrier • Enables a group of threads to wait at a predefined execution point Exchanger • Exchanges data between two threads
• 11.
  Executor Future ExecutorService ThreadPool Executor ScheduledPool Executor Callable
• 12.
   Executor Interface ◦ Executor ◦ExecutorService ◦ SheduledThreadExecutorService   Fork/Join Thread Pools ◦ ThreadPoolExecutor ◦ ScheduledThreadPoolExecutor
• 13.
  Concurrent HashMap Concurrent LinkedQueue CopyOnWrite ArrayList Array BlockingQueue Concurrent SkipListMap Concurrent SkipListSet CopyOnWrite ArraySet DelayQueue LinkedBlocking Deque LinkedBlocking Queue Prioirty BlockingQueue Synchronous Queue
• 14.
  DAYS NANO SECONDS MILLI SECONDS HOURS TimeUnit Enumeration MINUTES MICRO SECONDS SECONDS
• 15.
  Lock ReadWriteLock ReentrantLock Reentrant ReadWriteLock
• 16.
  AtomicInteger AtomicLong decrementAndGet() compareAndSet() addAndGet()
• 17.
  Independent of scheduling and interleaving Behaves correctly (unambiguous) Without additional synchronization Thread safe
• 18.
  synchronized volatile • The primarymechanism for synchronization • Enables the thread to bypass the cache when accessing the data