bool RWLockImpl::tryWriteLockImpl()
{
addWriter();
HANDLE h[2];
h[0] = _mutex;
h[1] = _writeEvent;
switch (WaitForMultipleObjects(2, h, TRUE, 1))
{
case WAIT_OBJECT_0:
case WAIT_OBJECT_0 + 1:
--_writersWaiting;
++_readers;
++_writers;
ResetEvent(_readEvent);
ResetEvent(_writeEvent);
ReleaseMutex(_mutex);
poco_assert_dbg(_writers == 1);
return true;
case WAIT_TIMEOUT:
removeWriter();
return false;
default:
removeWriter();
throw SystemException("cannot lock reader/writer lock");
}
}
bool RWLockImpl::tryWriteLockImpl()
{
addWriter();
HANDLE h[2];
h[0] = _mutex;
h[1] = _writeEvent;
switch (WaitForMultipleObjects(2, h, TRUE, 1))
{
case WAIT_OBJECT_0:
case WAIT_OBJECT_0 + 1:
--_writersWaiting;
++_readers;
++_writers;
ResetEvent(_readEvent);
ResetEvent(_writeEvent);
ReleaseMutex(_mutex);
ASSERT(_writers == 1);
return true;
case WAIT_TIMEOUT:
removeWriter();
return false;
default:
removeWriter();
NIT_THROW_FMT(EX_SYSTEM, "cannot lock reader/writer lock");
}
}
Stage& PipelineManager::makeWriter(const std::string& outputFile,
std::string driver)
{
if (driver.empty())
{
driver = StageFactory::inferWriterDriver(outputFile);
if (driver.empty())
throw pdal_error("Cannot determine writer for output file: " +
outputFile);
}
Options options;
if (!outputFile.empty())
options.add("filename", outputFile);
auto& writer = addWriter(driver);
setOptions(writer, options);
return writer;
}
Stage& PipelineManager::makeWriter(StageCreationOptions& o)
{
if (o.m_driver.empty())
{
o.m_driver = StageFactory::inferWriterDriver(o.m_filename);
if (o.m_driver.empty())
throw pdal_error("Cannot determine writer for output file: " +
o.m_filename);
}
if (!o.m_filename.empty())
o.m_options.replace("filename", o.m_filename);
auto& writer = addWriter(o.m_driver);
writer.setTag(o.m_tag);
setOptions(writer, o.m_options);
if (o.m_parent)
writer.setInput(*o.m_parent);
return writer;
}
void RWLockImpl::writeLockImpl()
{
addWriter();
HANDLE h[2];
h[0] = _mutex;
h[1] = _writeEvent;
switch (WaitForMultipleObjects(2, h, TRUE, INFINITE))
{
case WAIT_OBJECT_0:
case WAIT_OBJECT_0 + 1:
--_writers;
++_readers;
ResetEvent(_readEvent);
ResetEvent(_writeEvent);
ReleaseMutex(_mutex);
break;
default:
removeWriter();
throw SystemException("cannot lock reader/writer lock");
}
}
void doSomeStuff(){
printf("Creating account for Dan Brown\n");
struct Writer danBrown = newWriter(
"Dan Brown",
"danbrown",
"password"
);
addWriter(&danBrown, &eBookStore);
printf("Created account for Dan Brown with ID %d\n\n", danBrown.id);
printf("Adding the book Angels and Demons\n");
struct Book angelsAndDemons = newBook(
"Angels and Demons",
"Dan Brown",
"Science and Mythology and Stuff",
"In not so distant past...",
danBrown.id,
100
);
publishBook(&angelsAndDemons, &eBookStore);
printf("Added the book Angels and Demons with ID %d\n\n", angelsAndDemons.id);
printf("Adding the book Da Vinci Code\n");
struct Book daVinciCode = newBook(
"Da Vinci Code",
"Dan Brown",
"Its about the hipster Leo",
"Once upon a time...",
danBrown.id,
100
);
publishBook(&daVinciCode, &eBookStore);
printf("Added the book Da Vinci Code with ID %d\n\n", daVinciCode.id);
printf("Books published by %s on our platform are,\n", danBrown.name);
for(int i=0;i<danBrown.bookCount;i++){
int bookID = danBrown.bookIDs[i];
struct Book *b = eBookStore.bookDataStore.books[bookID];
printf("#%d:\t%s\n", i+1, b->title);
}
printf("\n");
printf("Finding books similar to %s\n", daVinciCode.title);
assignSimilarBooks(&daVinciCode, &eBookStore);
for(int i=0;i<daVinciCode.similarBookCount;i++){
int bookID = daVinciCode.similarBooks[i];
struct Book *b = eBookStore.bookDataStore.books[bookID];
printf("#%d:\t%s\n", i+1, b->title);
}
printf("\n");
printf("Creating customer account for Robert Langdon\n");
struct Customer robertLangdon = newCustomer("robertlangdon", "password");
addCustomerToDataStore(&robertLangdon, &eBookStore.customerDataStore);
printf("Created customer account for Robert Langdon with user id %d\n\n", robertLangdon.id);
printf("Searching for books with the title 'Angels and Demons'\n");
struct Book* searchResult = searchBooksInDataStore(1, "Angels and Demons", 1, &eBookStore.bookDataStore)[0];
printf("Found one book with the name %s by the author %s\n", searchResult->title, searchResult->author);
printf("Its summary is, %s\n\n", searchResult->summary);
printf("Submitting an excellent review for %s from user name %s\n", searchResult->title, robertLangdon.username);
addReview(searchResult, &robertLangdon, 5, "Awesome read! :)", &eBookStore);
printf("Fetching all reviews for %s,\n", searchResult->title);
for(int i=0;i<searchResult->reviewCount;i++){
printf("#%d: Rating: %d Comments: %s\n", i+1, searchResult->reviews[i]->rating, searchResult->reviews[i]->body);
}
printf("Average rating of %s is %f\n\n", searchResult->title, getAverageRating(searchResult));
printf("That's all for this demo folks! :)\n");
}