Java?????????????????
???????????? ???????[ 2016/1/22 11:15:15 ] ??????????????? ????????
???????????????????AbstractLifeCycle?????ILifeCycle??????????????????????????????????????????ü?????????????????????????ILifeCycle?ж???????н?????????????????????????????????AbstractLifeCycle???????????
public abstract class AbstractLifecycle implements ILifecycle { private List<ILifecycleListener> listeners = new CopyOnWriteArrayList<ILifecycleListener>(); /** * state ???????????????? */ private LifecycleState state = LifecycleState.NEW; /* * @see ILifecycle#init() */ @Override public final synchronized void init() throws LifecycleException { if (state != LifecycleState.NEW) { return; } setStateAndFireEvent(LifecycleState.INITIALIZING); try { init0(); } catch (Throwable t) { setStateAndFireEvent(LifecycleState.FAILED); if (t instanceof LifecycleException) { throw (LifecycleException) t; } else { throw new LifecycleException(formatString( "Failed to initialize {0}?? Error Msg: {1}"?? toString()?? t.getMessage())?? t); } } setStateAndFireEvent(LifecycleState.INITIALIZED); } protected abstract void init0() throws LifecycleException; /* * @see ILifecycle#start() */ @Override public final synchronized void start() throws LifecycleException { if (state == LifecycleState.NEW) { init(); } if (state != LifecycleState.INITIALIZED) { return; } setStateAndFireEvent(LifecycleState.STARTING); try { start0(); } catch (Throwable t) { setStateAndFireEvent(LifecycleState.FAILED); if (t instanceof LifecycleException) { throw (LifecycleException) t; } else { throw new LifecycleException(formatString("Failed to start {0}?? Error Msg: {1}"?? toString()?? t.getMessage())?? t); } } setStateAndFireEvent(LifecycleState.STARTED); } protected abstract void start0() throws LifecycleException; /* * @see ILifecycle#suspend() */ @Override public final synchronized void suspend() throws LifecycleException { if (state == LifecycleState.SUSPENDING || state == LifecycleState.SUSPENDED) { return; } if (state != LifecycleState.STARTED) { return; } setStateAndFireEvent(LifecycleState.SUSPENDING); try { suspend0(); } catch (Throwable t) { setStateAndFireEvent(LifecycleState.FAILED); if (t instanceof LifecycleException) { throw (LifecycleException) t; } else { throw new LifecycleException(formatString("Failed to suspend {0}?? Error Msg: {1}"?? toString()?? t.getMessage())?? t); } } setStateAndFireEvent(LifecycleState.SUSPENDED); } protected abstract void suspend0() throws LifecycleException; /* * @see ILifecycle#resume() */ @Override public final synchronized void resume() throws LifecycleException { if (state != LifecycleState.SUSPENDED) { return; } setStateAndFireEvent(LifecycleState.RESUMING); try { resume0(); } catch (Throwable t) { setStateAndFireEvent(LifecycleState.FAILED); if (t instanceof LifecycleException) { throw (LifecycleException) t; } else { throw new LifecycleException(formatString("Failed to resume {0}?? Error Msg: {1}"?? toString()?? t.getMessage())?? t); } } setStateAndFireEvent(LifecycleState.RESUMED); } protected abstract void resume0() throws LifecycleException; /* * @see ILifecycle#destroy() */ @Override public final synchronized void destroy() throws LifecycleException { if (state == LifecycleState.DESTROYING || state == LifecycleState.DESTROYED) { return; } setStateAndFireEvent(LifecycleState.DESTROYING); try { destroy0(); } catch (Throwable t) { setStateAndFireEvent(LifecycleState.FAILED); if (t instanceof LifecycleException) { throw (LifecycleException) t; } else { throw new LifecycleException(formatString("Failed to destroy {0}?? Error Msg: {1}"?? toString()?? t.getMessage())?? t); } } setStateAndFireEvent(LifecycleState.DESTROYED); } protected abstract void destroy0() throws LifecycleException; /* * @see * ILifecycle#addLifecycleListener(ILifecycleListener) */ @Override public void addLifecycleListener(ILifecycleListener listener) { listeners.add(listener); } /* * @see * ILifecycle#removeLifecycleListener(ILifecycleListener) */ @Override public void removeLifecycleListener(ILifecycleListener listener) { listeners.remove(listener); } private void fireLifecycleEvent(LifecycleEvent event) { for (Iterator<ILifecycleListener> it = listeners.iterator(); it.hasNext();) { ILifecycleListener listener = it.next(); listener.lifecycleEvent(event); } } protected synchronized LifecycleState getState() { return state; } private synchronized void setStateAndFireEvent(LifecycleState newState) throws LifecycleException { state = newState; fireLifecycleEvent(new LifecycleEvent(state)); } private String formatString(String pattern?? Object... arguments) { return MessageFormat.format(pattern?? arguments); } /* * @see java.lang.Object#toString() */ @Override public String toString() { return getClass().getSimpleName(); } }
??????????????????????????????????????????????????????飬?????????????????(?????start???????init)???????????????????????????????
???????????????ILifeCycle????????????????????????????????????????????????????????????????????????????Щ:
protected abstract void init0() throws LifecycleException; protected abstract void start0() throws LifecycleException; protected abstract void suspend0() throws LifecycleException; protected abstract void resume0() throws LifecycleException; protected abstract void destroy0() throws LifecycleException;
????????????
???????????????????????????ILifeCycle????????????AbstractLifeCycle?????????????????????ò???????????д??????????AbstractLifecycle??????д?????????????so far so good??
????????????????????????????????????
?????????????????????е???????????????
??????????????????????init0?? start0?? suspend0?? resume0?? destroy0?
???????????????????Щ???????????????鰱????????(suspend)?????(resume)?
?????????AbstractLifeCycle????ζ??????????????????????
??????????????????????????DefaultLifeCycle?????????AbstractLifeCycle??????????г??????????????????κ????????飬 do nothing???????????????????????????????????????????д????????????
??????????????DefaultLifeCycle?????????:
public class DefaultLifecycle extends AbstractLifecycle { /* * @see AbstractLifecycle#init0() */ @Override protected void init0() throws LifecycleException { // do nothing } /* * @see AbstractLifecycle#start0() */ @Override protected void start0() throws LifecycleException { // do nothing } /* * @see AbstractLifecycle#suspend0() */ @Override protected void suspendInternal() throws LifecycleException { // do nothing } /* * @see AbstractLifecycle#resume0() */ @Override protected void resume0() throws LifecycleException { // do nothing } /* * @see AbstractLifecycle#destroy0() */ @Override protected void destroy0() throws LifecycleException { // do nothing } }
????????DefaultLifeCycle?????do nothing???????
???????????????????д????????????????DefaultLifeCycle??????д??Щ????????????????????
???????磬????????????????????????????????????Щ??????????????д:
import java.io.IOException; import java.net.ServerSocket; import java.net.Socket; public class SocketServer extends DefaultLifecycle { private ServerSocket acceptor = null; private int port = 9527; /* * @see DefaultLifecycle#init0() */ @Override protected void init0() throws LifecycleException { try { acceptor = new ServerSocket(port); } catch (IOException e) { throw new LifecycleException(e); } } /* * @see DefaultLifecycle#start0() */ @Override protected void start0() throws LifecycleException { Socket socket = null; try { socket = acceptor.accept(); //do something with socket } catch (IOException e) { throw new LifecycleException(e); } finally { if (socket != null) { try { socket.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } /* * @see DefaultLifecycle#destroy0() */ @Override protected void destroy0() throws LifecycleException { if (acceptor != null) { try { acceptor.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }
?????????ServerSocket?У?init0?????socket??????start0??????socket????? destroy0????socket??????
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