fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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mrambacher e628f59e87 Create a CustomEnv class; Add WinFileSystem; Make LegacyFileSystemWrapper private (#7703) ... Summary: This PR does the following: -> Creates a WinFileSystem class. This class is the Windows equivalent of the PosixFileSystem and will be used on Windows systems. -> Introduces a CustomEnv class. A CustomEnv is an Env that takes a FileSystem as constructor argument. I believe there will only ever be two implementations of this class (PosixEnv and WinEnv). There is still a CustomEnvWrapper class that takes an Env and a FileSystem and wraps the Env calls with the input Env but uses the FileSystem for the FileSystem calls -> Eliminates the public uses of the LegacyFileSystemWrapper. With this change in place, there are effectively the following patterns of Env: - "Base Env classes" (PosixEnv, WinEnv). These classes implement the core Env functions (e.g. Threads) and have a hard-coded input FileSystem. These classes inherit from CompositeEnv, implement the core Env functions (threads) and delegate the FileSystem-like calls to the input file system. - Wrapped Composite Env classes (MemEnv). These classes take in an Env and a FileSystem. The core env functions are re-directed to the wrapped env. The file system calls are redirected to the input file system - Legacy Wrapped Env classes. These classes take in an Env input (but no FileSystem). The core env functions are re-directed to the wrapped env. A "Legacy File System" is created using this env and the file system calls directed to the env itself. With these changes in place, the PosixEnv becomes a singleton -- there is only ever one created. Any other use of the PosixEnv is via another wrapped env. This cleans up some of the issues with the env construction and destruction. Additionally, there were places in the code that required had an Env when they required a FileSystem. Many of these places would wrap the Env with a LegacyFileSystemWrapper instead of using the env->GetFileSystem(). These places were changed, thereby removing layers of additional redirection (LegacyFileSystem --> Env --> Env::FileSystem). Pull Request resolved: https://github.com/facebook/rocksdb/pull/7703 Reviewed By: zhichao-cao Differential Revision: D25762190 Pulled By: anand1976 fbshipit-source-id: 1a088e97fc916f28ac69c149cd1dcad0ab31704b		4 years ago
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backupable	Skip WALs according to MinLogNumberToKeep when creating checkpoint (#7789)	4 years ago
blob_db	Create a CustomEnv class; Add WinFileSystem; Make LegacyFileSystemWrapper private (#7703)	4 years ago
cassandra	Add more tests for assert status checked (#7524)	4 years ago
checkpoint	Skip WALs according to MinLogNumberToKeep when creating checkpoint (#7789)	4 years ago
compaction_filters	Compaction filter support for BlobDB (#6850)	4 years ago
convenience	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
leveldb_options	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
memory	No elide constructors (#7798)	4 years ago
merge_operators	No elide constructors (#7798)	4 years ago
option_change_migration	Add more tests for assert status checked (#7524)	4 years ago
options	Create a CustomEnv class; Add WinFileSystem; Make LegacyFileSystemWrapper private (#7703)	4 years ago
persistent_cache	Fix many tests to run with MEM_ENV and ENCRYPTED_ENV; Introduce a MemoryFileSystem class (#7566)	4 years ago
simulator_cache	Bring the Configurable options together (#5753)	4 years ago
table_properties_collectors	Add more tests for assert status checked (#7524)	4 years ago
trace	Add some simulator cache and block tracer tests to ASSERT_STATUS_CHECKED (#7305)	4 years ago
transactions	Disable BasicLockEscalation if cannot determine whether TSAN is enabled (#7814)	4 years ago
ttl	Add more tests for assert status checked (#7524)	4 years ago
write_batch_with_index	Eliminate the creation of ImmutableDBOptions in WBWI::GetFromBatch (#6851)	4 years ago
debug.cc	In ParseInternalKey(), include corrupt key info in Status (#7515)	4 years ago
env_librados.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_librados.md	Add EnvLibrados - RocksDB Env of RADOS (#1222)	8 years ago
env_librados_test.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_mirror.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_mirror_test.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_timed.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
env_timed_test.cc	Make env*_test work with ASSERT_STATUS_CHECKED (#7176)	4 years ago
fault_injection_env.cc	No elide constructors (#7798)	4 years ago
fault_injection_env.h	Status check enforcement for error_handler_fs_test (#7342)	4 years ago
fault_injection_fs.cc	Inject the random write error to stress test (#7653)	4 years ago
fault_injection_fs.h	Inject the random write error to stress test (#7653)	4 years ago
merge_operators.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
object_registry.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
object_registry_test.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago
util_merge_operators_test.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	4 years ago