72 
 73     /**
 74      * Maps a file descriptor to an index from 0 to {@code toIndex}.
 75      * @implSpec The default implementation is good for Unix file descriptors.
 76      */
 77     int fdValToIndex(int fdVal, int toIndex) {
 78         return fdVal & (toIndex - 1);
 79     }
 80 
 81     /**
 82      * Creates a Poller for POLLIN polling.
 83      * @param subPoller true to create a sub-poller
 84      */
 85     abstract Poller readPoller(boolean subPoller) throws IOException;
 86 
 87     /**
 88      * Creates a Poller for POLLOUT polling.
 89      * @param subPoller true to create a sub-poller
 90      */
 91     abstract Poller writePoller(boolean subPoller) throws IOException;
















 92 }

 72 
 73     /**
 74      * Maps a file descriptor to an index from 0 to {@code toIndex}.
 75      * @implSpec The default implementation is good for Unix file descriptors.
 76      */
 77     int fdValToIndex(int fdVal, int toIndex) {
 78         return fdVal & (toIndex - 1);
 79     }
 80 
 81     /**
 82      * Creates a Poller for POLLIN polling.
 83      * @param subPoller true to create a sub-poller
 84      */
 85     abstract Poller readPoller(boolean subPoller) throws IOException;
 86 
 87     /**
 88      * Creates a Poller for POLLOUT polling.
 89      * @param subPoller true to create a sub-poller
 90      */
 91     abstract Poller writePoller(boolean subPoller) throws IOException;
 92 
 93     /**
 94      * Returns true if read pollers support read ops in addition to POLLIN polling.
 95      * @implSpec The default implementation returns false.
 96      */
 97     boolean supportReadOps() {
 98         return false;
 99     }
100 
101     /**
102      * Returns true if write pollers support write ops in addition to POLLOUT polling.
103      * @implSpec The default implementation returns false.
104      */
105     boolean supportWriteOps() {
106         return false;
107     }
108 }