001package votorola.g.util.concurrent; // Copyright 2006, 2009, Michael Allan. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE. 002 003import java.util.concurrent.*; 004import votorola.g.lang.*; 005import votorola.g.logging.*; 006 007 008/** An extended ScheduledThreadPoolExecutor. 009 */ 010public @ThreadSafe final class ScheduledThreadPoolExecutorX extends ScheduledThreadPoolExecutor 011{ 012 013 014 /** Constructs a ScheduledThreadPoolExecutorX with a no-op catcher. 015 * 016 * @see #getCorePoolSize() 017 * @see #getThreadFactory() 018 * @see #catcher() 019 */ 020 public ScheduledThreadPoolExecutorX( int _corePoolSize, ThreadFactory _threadFactory ) 021 { 022 super( _corePoolSize, _threadFactory ); 023 catcher = Catcher00.i(); 024 } 025 026 027 028 /** Constructs a ScheduledThreadPoolExecutorX. 029 * 030 * @see #getCorePoolSize() 031 * @see #getThreadFactory() 032 * @see #catcher() 033 */ 034 public ScheduledThreadPoolExecutorX( int _corePoolSize, ThreadFactory _threadFactory, 035 Catcher<Runnable> _catcher ) 036 { 037 super( _corePoolSize, _threadFactory ); 038 catcher = _catcher; 039 if( !ThreadSafe.U.isThreadSafe( catcher, "catchException", Object.class, Exception.class )) throw new IllegalArgumentException( "catcher.catchException(-) is not thread-safe" ); 040 } 041 042 043 044 // ------------------------------------------------------------------------------------ 045 046 047 /** The catcher for all execution exceptions. Normally, it ought not to rethrow 048 * whatever is caught, because the executor will already be aware of it. 049 */ 050 public Catcher<Runnable> catcher() { return catcher; } 051 052 053 private final Catcher<Runnable> catcher; 054 055 056 057 // - T h r e a d - P o o l - E x e c u t o r ------------------------------------------ 058 059 060 protected @Override void afterExecute( final Runnable r, Throwable t ) 061 { 062 super.afterExecute( r, t ); 063 if( r instanceof FutureTask<?> ) 064 { 065 if( t != null ) LoggerX.i(getClass()).config( "FutureTask is no longer hiding exceptions from afterExecute()" ); // code needs updating 066 else 067 { 068 final FutureTask<?> futureTask = (FutureTask<?>)r; 069 if( futureTask.isDone() ) // returns false when completed normally (API docs are lying), in which case futureTask.get() hangs, even with a timeout 070 { 071 try 072 { 073 futureTask.get(); // expose the hidden exception, if any 074 } 075 catch( ExecutionException x ) { t = x.getCause(); } // cannot expose the wrapped runnable though, no such method 076 catch( Throwable x ) 077 { 078 t = new Exception( "unexpected exception from executor", x ); 079 } 080 } 081 } 082 } 083 if( t != null ) 084 { 085 if( t instanceof Error ) catcher.catchError( r, (Error)t ); 086 else if( t instanceof Exception ) catcher.catchException( r, (Exception)t ); 087 else assert false; 088 } 089 } 090 091 092 093} 094