分布式任務系統Gearman for Python Demo

瞭解Gearman，請訪問gearman官網：http://gearman.org/index.php?id=getting_started
Gearman for Python API Doc: http://pythonhosted.org/gearman/

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安裝Gearman:
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    基礎依賴庫：yum install boost-devel libevent-devel sqlite-devel libuuid-devel
    wget https://launchpad.net/gearmand/trunk/0.33/+download/gearmand-0.33.tar.gz  
    tar xzvf gearmand-0.33.tar.gz  
    cd gearmand-0.33  
    ./configure  
    make  
    make install

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安裝Gearman Python用戶端
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    wget http://pypi.python.org/packages/source/g/gearman/gearman-2.0.2.tar.gz#md5=3847f15b763dc680bc672a610b77c7a7  
    tar xvzf  gearman-2.0.2.tar.gz  
    python setup.py install  

    擷取直接用自動安裝： easy_install gearman

    啟動服務：gearmand -d
    啟動Worker：gearman -w -f wc -- wc -l &
            -w 代表啟動的是worker，-f wc 代表啟動一個task名字為wc， -- wc -l表示這個task是做wc -l 統計行數。
    啟動Client：gearman -f wc < /etc/passwd

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python work代碼：
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    import os  
    import gearman  
    import math       
    class MyGearmanWorker(gearman.GearmanWorker):    
        def on_job_execute(self, current_job):    
            print "Job started"   
            return super(MyGearmanWorker, self).on_job_execute(current_job)    
       
    def task_callback(gearman_worker, gearman_job):    
        print gearman_job.data   
        return gearman_job.data  
       
    my_worker = MyGearmanWorker(['192.168.0.75:4730'])    
    my_worker.register_task("echo", task_callback)    
    my_worker.work() 

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python client代碼：
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    from gearman import GearmanClient       
    gearman_client = GearmanClient(['192.168.0.75:4730'])  
    gearman_request = gearman_client.submit_job('echo', 'foo')  
    result_data = gearman_request.result  
    print result_data