| 1 | package diskCacheV111.util; |
| 2 | |
| 3 | import java.util.concurrent.SynchronousQueue; |
| 4 | import java.util.concurrent.ThreadPoolExecutor; |
| 5 | import java.util.concurrent.TimeUnit; |
| 6 | import java.util.concurrent.ThreadFactory; |
| 7 | import java.util.concurrent.Executors; |
| 8 | |
| 9 | import dmg.cells.nucleus.CellAdapter; |
| 10 | import dmg.cells.nucleus.CDC; |
| 11 | |
| 12 | import org.dcache.util.CDCThreadFactory; |
| 13 | import org.dcache.util.FireAndForgetTask; |
| 14 | |
| 15 | /** |
| 16 | * |
| 17 | * ThreadPoolNG ( Thread Pool New Generation is a |
| 18 | * java concurrent based implementation of dCache |
| 19 | * Thread pool. While it's nothing else than wrapper |
| 20 | * around ThreadPoolExecutor, it's better to replace all |
| 21 | * instances of ThreadPool with pure ThreadPoolExecutor. |
| 22 | * |
| 23 | * @since 1.8 |
| 24 | */ |
| 25 | public class ThreadPoolNG implements ThreadPool { |
| 26 | |
| 27 | private static final int CORE_SIZE = 0; |
| 28 | private static final int MAX_SIZE = Integer.MAX_VALUE; |
| 29 | private static final long KEEP_ALIVE = 60L; |
| 30 | |
| 31 | private final ThreadPoolExecutor _executor; |
| 32 | |
| 33 | public ThreadPoolNG(CellAdapter cell) |
| 34 | { |
| 35 | this(cell.getNucleus()); |
| 36 | } |
| 37 | |
| 38 | public ThreadPoolNG() |
| 39 | { |
| 40 | this(Executors.defaultThreadFactory()); |
| 41 | } |
| 42 | |
| 43 | private ThreadPoolNG(ThreadFactory factory) |
| 44 | { |
| 45 | _executor = new ThreadPoolExecutor(CORE_SIZE, |
| 46 | MAX_SIZE, |
| 47 | KEEP_ALIVE, |
| 48 | TimeUnit.SECONDS, |
| 49 | new SynchronousQueue<Runnable>(), |
| 50 | new CDCThreadFactory(factory)); |
| 51 | } |
| 52 | |
| 53 | |
| 54 | public int getCurrentThreadCount() { |
| 55 | return _executor.getActiveCount(); |
| 56 | } |
| 57 | |
| 58 | public int getMaxThreadCount() { |
| 59 | return _executor.getMaximumPoolSize(); |
| 60 | } |
| 61 | |
| 62 | public int getWaitingThreadCount() { |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | public void invokeLater(final Runnable runner, String name) |
| 67 | { |
| 68 | final CDC cdc = new CDC(); |
| 69 | Runnable wrapper = new Runnable() { |
| 70 | public void run() |
| 71 | { |
| 72 | cdc.apply(); |
| 73 | try { |
| 74 | runner.run(); |
| 75 | } finally { |
| 76 | CDC.clear(); |
| 77 | } |
| 78 | } |
| 79 | }; |
| 80 | |
| 81 | _executor.execute(new FireAndForgetTask(wrapper)); |
| 82 | } |
| 83 | |
| 84 | public void setMaxThreadCount(int maxThreadCount) |
| 85 | throws IllegalArgumentException { |
| 86 | |
| 87 | /* |
| 88 | * Be backward compatible with |
| 89 | */ |
| 90 | if(maxThreadCount == 0) |
| 91 | maxThreadCount = MAX_SIZE; |
| 92 | |
| 93 | _executor.setMaximumPoolSize(maxThreadCount); |
| 94 | } |
| 95 | |
| 96 | public String toString() { |
| 97 | return "ThreadPoolNG $Revision: 1.4 $ max/active: " + getMaxThreadCount() + "/" + getCurrentThreadCount(); |
| 98 | } |
| 99 | } |