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BESH4MCache.cc
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BESH4MCache.cc
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/////////////////////////////////////////////////////////////////////////////
// This file includes cache handling routines for the HDF4 handler.
// The skeleton of the code is adapted from BESDapResponseCache.cc under bes/dap
// Authors: MuQun Yang <myang6@hdfgroup.org>
// Copyright (c) 2014 The HDF Group
/////////////////////////////////////////////////////////////////////////////
#include "config.h"
#include <sys/stat.h>
#include <iostream>
#include <sstream>
#include "BESH4MCache.h"
#include "BESUtil.h"
#include "BESInternalError.h"
#include "TheBESKeys.h"
#include "BESDebug.h"
#include "HDF4RequestHandler.h"
using namespace std;
BESH4Cache *BESH4Cache::d_instance = 0;
bool BESH4Cache::d_enabled = true;
const string BESH4Cache::PATH_KEY = "HDF4.Cache.latlon.path";
const string BESH4Cache::PREFIX_KEY = "HDF4.Cache.latlon.prefix";
const string BESH4Cache::SIZE_KEY = "HDF4.Cache.latlon.size";
long BESH4Cache::getCacheSizeFromConfig()
{
if (HDF4RequestHandler::get_cache_latlon_size_exist() == true) {
BESDEBUG("cache",
"In BESH4Cache::getCacheSize(): Located BES key " << SIZE_KEY<< "=" << HDF4RequestHandler::get_cache_latlon_size() << endl);
return HDF4RequestHandler::get_cache_latlon_size();
}
else {
string msg = "[ERROR] BESH4Cache::getCacheSize() - The BES Key " + SIZE_KEY
+ " is not set! It MUST be set to utilize the HDF4 cache. ";
BESDEBUG("cache", msg);
throw BESInternalError(msg, __FILE__, __LINE__);
}
}
string BESH4Cache::getCachePrefixFromConfig()
{
if (HDF4RequestHandler::get_cache_latlon_prefix_exist() == true) {
BESDEBUG("cache",
"In BESH4Cache::getCachePrefix(): Located BES key " << PREFIX_KEY<< "=" << HDF4RequestHandler::get_cache_latlon_prefix() << endl);
return HDF4RequestHandler::get_cache_latlon_prefix();
}
else {
string msg = "[ERROR] BESH4Cache::getCachePrefix() - The BES Key " + PREFIX_KEY
+ " is not set! It MUST be set to utilize the HDF4 cache. ";
BESDEBUG("cache", msg);
throw BESInternalError(msg, __FILE__, __LINE__);
}
}
string BESH4Cache::getCacheDirFromConfig()
{
if (HDF4RequestHandler::get_cache_latlon_path_exist() == true) {
BESDEBUG("cache",
"In BESH4Cache::getCacheDirFromConfig(): Located BES key " << PATH_KEY<< "=" << HDF4RequestHandler::get_cache_latlon_path() << endl);
return HDF4RequestHandler::get_cache_latlon_path();
}
else {
string msg = "[ERROR] BESH4Cache::getCachePrefix() - The BES Key " + PREFIX_KEY
+ " is not set! It MUST be set to utilize the HDF4 cache. ";
BESDEBUG("cache", msg);
throw BESInternalError(msg, __FILE__, __LINE__);
}
}
BESH4Cache::BESH4Cache()
{
BESDEBUG("cache", "In BESH4Cache::BESH4Cache()" << endl);
string cacheDir = getCacheDirFromConfig();
string prefix = getCachePrefixFromConfig();
long size_in_megabytes = getCacheSizeFromConfig();
BESDEBUG("cache",
"BESH4Cache() - Cache config params: " << cacheDir << ", " << prefix << ", " << size_in_megabytes << endl);
// The required params must be present. If initialize() is not called,
// then d_cache will stay null and is_available() will return false.
// Also, the directory 'path' must exist, or d_cache will be null.
if (!cacheDir.empty() && size_in_megabytes > 0) {
BESDEBUG("cache", "Before calling initialize function." << endl);
initialize(cacheDir, prefix, size_in_megabytes);
}
BESDEBUG("cache", "Leaving BESH4Cache::BESH4Cache()" << endl);
}
/** Get the default instance of the BESH4Cache object. This will read "TheBESKeys" looking for the values
* of FUNCTION_CACHE_PATH, FUNCTION_CACHE_PREFIX, an FUNCTION_CACHE_SIZE to initialize the cache.
*/
BESH4Cache *
BESH4Cache::get_instance()
{
if (d_enabled && d_instance == 0) {
struct stat buf;
string cache_dir = getCacheDirFromConfig();
if ((stat(cache_dir.c_str(), &buf) == 0) && (buf.st_mode & S_IFDIR)) {
try {
d_instance = new BESH4Cache();
d_enabled = d_instance->cache_enabled();
if(!d_enabled){
delete d_instance;
d_instance = NULL;
BESDEBUG("cache", "BESH4Cache::"<<__func__ << "() - " <<
"Cache is DISABLED"<< endl);
}
else {
#ifdef HAVE_ATEXIT
atexit(delete_instance);
#endif
BESDEBUG("cache", "BESH4Cache::" << __func__ << "() - " <<
"Cache is ENABLED"<< endl);
}
}
catch (BESInternalError &bie) {
BESDEBUG("cache",
"BESH4Cache::get_instance(): Failed to obtain cache! msg: " << bie.get_message() << endl);
}
}
}
return d_instance;
}
// Check whether the real lat/lon file size is the same as the expected lat/lon size. If not, return false.
bool BESH4Cache::is_valid(const string & cache_file_name, const int expected_file_size)
{
struct stat st;
int result = stat(cache_file_name.c_str(), &st);
if (result != 0) {
string msg = "Cannot check the cached file " + cache_file_name;
throw BESInternalError(msg, __FILE__, __LINE__);
}
if (expected_file_size == st.st_size)
return true;
else
return false;
}
// This call will try to obtain the read lock.
bool BESH4Cache::get_data_from_cache(const string & cache_file_name, const int expected_file_size, int &fd)
{
#if 0
cerr<<"coming to get_data_from_cache "<<endl;
BESDEBUG("cache", "In BESH4Cache::get_data_from_cache()" << endl);
cerr<<"cache_file_name is "<<cache_file_name <<endl;
int fd1;
string cache_file_name1 = cache_file_name;
get_read_lock(cache_file_name1,fd1);
cerr<<"After get_read_lock "<<endl;
#endif
if (false == get_read_lock(cache_file_name, fd))
return false;
else if (false == is_valid(cache_file_name, expected_file_size)) {
unlock_and_close(cache_file_name);
purge_file(cache_file_name);
return false;
}
else
return true;
}
bool BESH4Cache::write_cached_data(const string & cache_file_name, const int expected_file_size,
const vector<double> &val)
{
BESDEBUG("cache", "In BESH4Cache::write_cached_data()" << endl);
int fd = 0;
bool ret_value = false;
// 1. create_and_lock.
if (create_and_lock(cache_file_name, fd)) {
ssize_t ret_val = 0;
// 2. write the file.
ret_val = write(fd, &val[0], expected_file_size);
// 3. If the written size is not the same as the expected file size, purge the file.
if (ret_val != expected_file_size) {
if (unlink(cache_file_name.c_str()) != 0) {
string msg = "Cannot remove the corrupt cached file " + cache_file_name;
throw BESInternalError(msg, __FILE__, __LINE__);
}
}
else {
unsigned long long size = update_cache_info(cache_file_name);
if (cache_too_big(size)) update_and_purge(cache_file_name);
ret_value = true;
}
// 4. release the lock.
unlock_and_close(cache_file_name);
}
return ret_value;
}
bool BESH4Cache::write_cached_data2(const string & cache_file_name, const int expected_file_size, const void *buf)
{
BESDEBUG("cache", "In BESH4Cache::write_cached_data()" << endl);
int fd = 0;
bool ret_value = false;
// 1. create_and_lock.
if (create_and_lock(cache_file_name, fd)) {
ssize_t ret_val = 0;
// 2. write the file.
ret_val = write(fd, buf, expected_file_size);
// 3. If the written size is not the same as the expected file size, purge the file.
if (ret_val != expected_file_size) {
if (unlink(cache_file_name.c_str()) != 0) {
string msg = "Cannot remove the corrupt cached file " + cache_file_name;
throw BESInternalError(msg, __FILE__, __LINE__);
}
}
else {
unsigned long long size = update_cache_info(cache_file_name);
if (cache_too_big(size)) update_and_purge(cache_file_name);
ret_value = true;
}
// 4. release the lock.
unlock_and_close(cache_file_name);
}
return ret_value;
}
#if 0
void BESH4Cache::dummy_test_func() {
cerr<<"BESH4Cache function is fine "<<endl;
}
string BESH4Cache::get_cache_file_name_h4(const string & src, bool mangle) {
return src;
}
#endif