Low Power Sensing Application initial checkin

[tinyos-2.x.git] / apps / tutorials / LowPowerSensing / sampleLog / SampleLogReaderP.nc

diff --git a/apps/tutorials/LowPowerSensing/sampleLog/SampleLogReaderP.nc b/apps/tutorials/LowPowerSensing/sampleLog/SampleLogReaderP.nc
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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) {}
+}
+