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BlockingCollection<T> implements what is essentially a blocking queue This means that it will automatically wait if an attempt is made to insert an item when the collection is full, and it will automatically wait if an attempt is made to remove an item if the collection is empty Because of this, it is a perfect solution for those situations that correspond to the producer/consumer pattern BlockingCollection<T> implements the ICollection, IEnumerable, IEnumerable<T>, and IDisposable interfaces BlockingCollection<T> defines the following constructors: public BlockingCollection( ) public BlockingCollection(int boundedCapacity) public BlockingCollection(IProducerConsumerCollection<T> collection) public BlockingCollection(IProducerConsumerCollection<T> collection, int boundedCapacity) In the first two, the collection that is wrapped by BlockingCollection<T> is an instance of ConcurrentQueue<T> In the second two, you can specify the collection that you want to underlie the BlockingCollection<T> If the boundedCapacity parameter is used, it will contain the maximum number of objects that the collection can hold before it blocks If boundedCapacity is not specified, then the collection is unbounded In addition to TryAdd( ) and TryTake( ), which parallel those specified by IProducerConsumerCollection<T>, BlockingCollection<T> defines several methods of its own The ones we will use are shown here: public void Add(T item) public T Take( ) When called on an unbounded collection, Add( ) adds item to the collection and then returns When called on a bounded collection, Add( ) will block if the collection is full After one or more items have been removed from the collection, the item will be added and Add( ) will return Take( ) removes an item from the collection and returns it If called on an empty collection, Take( ) will block until an item is available (There are also versions of these methods that take a CancellationToken) Using Add( ) and Take( ), you can implement a simple producer/consumer pattern, as demonstrated by the following program It creates a producer that generates the characters A through Z and a consumer that receives them Notice that it creates a BlockingCollection<T> that has a bound of 4
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// A simple example of BlockingCollection using using using using System; SystemThreadingTasks; SystemThreading; SystemCollectionsConcurrent;
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class BlockingDemo { static BlockingCollection<char> bc; // Produce the characters A to Z static void Producer() { for(char ch = 'A'; ch <= 'Z'; ch++) { bcAdd(ch);
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25:
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Collections, Enumerators, and Iterators
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ConsoleWriteLine("Producing " + ch); } } // Consume 26 characters static void Consumer() { for(int i=0; i < 26; i++) ConsoleWriteLine("Consuming " + bcTake()); } static void Main() { // Use a blocking collection that has a bound of 4 bc = new BlockingCollection<char>(4); // Create the producer and consumer tasks Task Prod = new Task(Producer); Task Con = new Task(Consumer); // Start the tasks ConStart(); ProdStart(); // Wait for both to finish try { TaskWaitAll(Con, Prod); } catch(AggregateException exc) { ConsoleWriteLine(exc); } finally { ConDispose(); ProdDispose(); bcDispose(); } } }
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If you run this program, you will see a mix of producer and consumer output Part of the reason for this is that bc has a bound of 4, which means that only four items can be added to bc before one must be taken off As an experiment try making bc an unbounded collection and observe the results In some environments, this will result in all items being produced before any are consumed Also, try using a bound of 1 In this case, only one item at a time can be produced Another method that you may find helpful when working with BlockingCollection<T> is CompleteAdding( ), shown here: public void CompleteAdding( ) Calling this method indicates that no further items will be added to the collection This causes the IsAddingComplete property to be true If the collection is also empty, then the property IsCompleted is true If IsCompleted is true, then calls to Take( ) will not block The IsAddingComplete and IsCompleted properties are shown here: public bool IsCompleted { get; } public bool IsAddingComplete { get; }
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Part II:
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