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/*
* Copyright (c) 2007 Stanford University.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
* - Neither the name of the Stanford University nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL STANFORD
* UNIVERSITY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @author Kevin Klues <klueska@cs.stanford.edu>
* @date July 24, 2007
*/
generic module SampleLogReaderP(typedef sample_type_t) {
provides {
interface SampleLogRead<sample_type_t>;
}
uses {
interface LogRead;
interface LogWrite;
}
}
implementation {
sample_type_t sample;
storage_cookie_t writeLocation;
command error_t SampleLogRead.readFirst() {
return call LogRead.seek(SEEK_BEGINNING);
}
command error_t SampleLogRead.readNext() {
atomic writeLocation = call LogWrite.currentOffset();
if(call LogRead.currentOffset() == writeLocation)
return ECANCEL;
else return call LogRead.read(&sample, sizeof(sample));
}
event void LogRead.readDone(void* buf, storage_len_t len, error_t error) {
signal SampleLogRead.readDone((sample_type_t*)buf, error);
}
event void LogRead.seekDone(error_t error) {
if(error == SUCCESS) {
error = call SampleLogRead.readNext();
if(error != SUCCESS)
signal SampleLogRead.readDone(&sample, error);
}
else signal SampleLogRead.readDone(&sample, error);
}
event void LogWrite.appendDone(void* buf, storage_len_t len, bool recordsLost, error_t error) {}
event void LogWrite.eraseDone(error_t error) {}
event void LogWrite.syncDone(error_t error) {}
default event void SampleLogRead.readDone(sample_type_t* s, error_t error) {}
}
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