Lucene 源码分析集------- ThreadPool_lucenethreadpool.andthread-优快云博客

博客介绍了线程池的管理方式，由线程池实现Future负责具体操作，threadpool负责整体管理和接口，采用异步化管理模式，提升操作效率。

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线程池实现Future负责具体操作，threadpool负责整体管理和及接口，异步化管理。

class Future : public LuceneObject {
public:
    virtual ~Future();

protected:
    boost::any value;

public:
    void set(const boost::any& value) {
        SyncLock syncLock(this);
        this->value = value;
    }

    template <typename TYPE>
    TYPE get() {
        SyncLock syncLock(this);
        while (value.empty()) {
            wait(10);
        }
        return value.empty() ? TYPE() : boost::any_cast<TYPE>(value);
    }
};

/// Utility class to handle a pool of threads.
class ThreadPool : public LuceneObject {
public:
    ThreadPool();
    virtual ~ThreadPool();

    LUCENE_CLASS(ThreadPool);

protected:
    boost::asio::io_service io_service;
    workPtr work;
    boost::thread_group threadGroup;

    static const int32_t THREADPOOL_SIZE;

public:
    /// Get singleton thread pool instance.
    static ThreadPoolPtr getInstance();

    template <typename FUNC>
    FuturePtr scheduleTask(FUNC func) {
        FuturePtr future(newInstance<Future>());
        io_service.post(boost::bind(&ThreadPool::execute<FUNC>, this, func, future));
        return future;
    }

protected:
    // this will be executed when one of the threads is available
    template <typename FUNC>
    void execute(FUNC func, const FuturePtr& future) {
        future->set(func());
        future->notifyAll();
    }
};