/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: sw=2 ts=2 sts=2 expandtab * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef mozilla_storage_StorageBaseStatementInternal_h_ #define mozilla_storage_StorageBaseStatementInternal_h_ #include "nsISupports.h" #include "nsCOMPtr.h" #include "mozStorageHelper.h" struct sqlite3; struct sqlite3_stmt; class mozIStorageBindingParamsArray; class mozIStorageBindingParams; class mozIStorageStatementCallback; class mozIStoragePendingStatement; namespace mozilla { namespace storage { #define STORAGEBASESTATEMENTINTERNAL_IID \ { \ 0xd18856c9, 0xbf07, 0x4ae2, { \ 0x94, 0x5b, 0x1a, 0xdd, 0x49, 0x19, 0x55, 0x2a \ } \ } class Connection; class StatementData; class AsyncStatementFinalizer; /** * Implementation-only interface and shared logix mix-in corresponding to * mozIStorageBaseStatement. Both Statement and AsyncStatement inherit from * this. The interface aspect makes them look the same to implementation innards * that aren't publicly accessible. The mix-in avoids code duplication in * common implementations of mozIStorageBaseStatement, albeit with some minor * performance/space overhead because we have to use defines to officially * implement the methods on Statement/AsyncStatement (and proxy to this base * class.) */ class StorageBaseStatementInternal : public nsISupports { public: NS_DECLARE_STATIC_IID_ACCESSOR(STORAGEBASESTATEMENTINTERNAL_IID) /** * @return the connection that this statement belongs to. */ Connection* getOwner() { return mDBConnection; } /** * Return the asynchronous statement, creating it if required. * * This is for use by the asynchronous execution code for StatementData * created by AsyncStatements. Statement internally uses this method to * prepopulate StatementData with the sqlite3_stmt. * * @param[out] stmt * The sqlite3_stmt for asynchronous use. * @return The SQLite result code for creating the statement if created, * SQLITE_OK if creation was not required. */ virtual int getAsyncStatement(sqlite3_stmt** _stmt) = 0; /** * Obtains the StatementData needed for asynchronous execution. * * This is for use by Connection to retrieve StatementData from statements * when executeAsync is invoked. * * @param[out] _data * A reference to a StatementData object that will be populated * upon successful execution of this method. * @return NS_OK if we were able to assemble the data, failure otherwise. */ virtual nsresult getAsynchronousStatementData(StatementData& _data) = 0; /** * Construct a new BindingParams to be owned by the provided binding params * array. This method exists so that BindingParamsArray does not need * factory logic to determine what type of BindingParams to instantiate. * * @param aOwner * The binding params array to own the newly created binding params. * @return The new mozIStorageBindingParams instance appropriate to the * underlying statement type. */ virtual already_AddRefed newBindingParams( mozIStorageBindingParamsArray* aOwner) = 0; protected: // mix-in bits are protected StorageBaseStatementInternal(); RefPtr mDBConnection; sqlite3* mNativeConnection; /** * Our asynchronous statement. * * For Statement this is populated by the first invocation to * getAsyncStatement. * * For AsyncStatement, this is null at creation time and initialized by the * async thread when it calls getAsyncStatement the first time the statement * is executed. (Or in the event of badly formed SQL, every time.) */ sqlite3_stmt* mAsyncStatement; /** * Initiate asynchronous finalization by dispatching an event to the * asynchronous thread to finalize mAsyncStatement. This acquires a reference * to this statement and proxies it back to the connection's owning thread * for release purposes. * * In the event the asynchronous thread is already gone or we otherwise fail * to dispatch an event to it we failover to invoking internalAsyncFinalize * directly. (That's what the asynchronous finalizer would have called.) * * @note You must not call this method from your destructor because its * operation assumes we are still alive. Call internalAsyncFinalize * directly in that case. */ void asyncFinalize(); /** * Cleanup the async sqlite3_stmt stored in mAsyncStatement if it exists by * attempting to dispatch to the asynchronous thread if available, finalizing * on this thread if it is not. * * @note Call this from your destructor, call asyncFinalize otherwise. */ void destructorAsyncFinalize(); NS_IMETHOD NewBindingParamsArray(mozIStorageBindingParamsArray** _array); NS_IMETHOD ExecuteAsync(mozIStorageStatementCallback* aCallback, mozIStoragePendingStatement** _stmt); NS_IMETHOD EscapeStringForLIKE(const nsAString& aValue, char16_t aEscapeChar, nsAString& _escapedString); // Needs access to internalAsyncFinalize friend class AsyncStatementFinalizer; }; NS_DEFINE_STATIC_IID_ACCESSOR(StorageBaseStatementInternal, STORAGEBASESTATEMENTINTERNAL_IID) #define NS_DECL_STORAGEBASESTATEMENTINTERNAL \ virtual Connection* getOwner(); \ virtual int getAsyncStatement(sqlite3_stmt** _stmt) override; \ virtual nsresult getAsynchronousStatementData(StatementData& _data) \ override; \ virtual already_AddRefed newBindingParams( \ mozIStorageBindingParamsArray* aOwner) override; /** * Helper macro to implement the proxying implementations. Because we are * implementing methods that are part of mozIStorageBaseStatement and the * implementation classes already use NS_DECL_MOZISTORAGEBASESTATEMENT we don't * need to provide declaration support. */ #define MIX_IMPL(_class, _optionalGuard, _method, _declArgs, _invokeArgs) \ NS_IMETHODIMP _class::_method _declArgs { \ _optionalGuard return StorageBaseStatementInternal::_method _invokeArgs; \ } /** * Define proxying implementation for the given _class. If a state invariant * needs to be checked and an early return possibly performed, pass the clause * to use as _optionalGuard. */ #define MIXIN_IMPL_STORAGEBASESTATEMENTINTERNAL(_class, _optionalGuard) \ MIX_IMPL(_class, _optionalGuard, NewBindingParamsArray, \ (mozIStorageBindingParamsArray * *_array), (_array)) \ MIX_IMPL(_class, _optionalGuard, ExecuteAsync, \ (mozIStorageStatementCallback * aCallback, \ mozIStoragePendingStatement * *_stmt), \ (aCallback, _stmt)) \ MIX_IMPL(_class, _optionalGuard, EscapeStringForLIKE, \ (const nsAString& aValue, char16_t aEscapeChar, \ nsAString& _escapedString), \ (aValue, aEscapeChar, _escapedString)) /** * Name-building helper for BIND_GEN_IMPL. */ #define BIND_NAME_CONCAT(_nameBit, _concatBit) Bind##_nameBit##_concatBit /** * We have type-specific convenience methods for C++ implementations in * two different forms; by index and by name. The following macro allows * us to avoid having to define repetitive things by hand. * * Because of limitations of macros and our desire to avoid requiring special * permutations for the null and blob cases (whose argument count varies), * we require that the argument declarations and corresponding invocation * usages are passed in. * * @param _class * The class name. * @param _guard * The guard clause to inject. * @param _declName * The argument list (with parens) for the ByName variants. * @param _declIndex * The argument list (with parens) for the ByIndex variants. * @param _invArgs * The invocation argumment list. */ #define BIND_GEN_IMPL(_class, _guard, _name, _declName, _declIndex, _invArgs) \ NS_IMETHODIMP _class::BIND_NAME_CONCAT(_name, ByName) _declName { \ _guard mozIStorageBindingParams* params = getParams(); \ NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \ return params->BIND_NAME_CONCAT(_name, ByName) _invArgs; \ } \ NS_IMETHODIMP _class::BIND_NAME_CONCAT(_name, ByIndex) _declIndex { \ _guard mozIStorageBindingParams* params = getParams(); \ NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \ return params->BIND_NAME_CONCAT(_name, ByIndex) _invArgs; \ } /** * Implement BindByName/BindByIndex for the given class. * * @param _class The class name. * @param _optionalGuard The guard clause to inject. */ #define BIND_BASE_IMPLS(_class, _optionalGuard) \ NS_IMETHODIMP _class::BindByName(const nsACString& aName, \ nsIVariant* aValue) { \ _optionalGuard mozIStorageBindingParams* params = getParams(); \ NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \ return params->BindByName(aName, aValue); \ } \ NS_IMETHODIMP _class::BindByIndex(uint32_t aIndex, nsIVariant* aValue) { \ _optionalGuard mozIStorageBindingParams* params = getParams(); \ NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \ return params->BindByIndex(aIndex, aValue); \ } /** * Define the various Bind*ByIndex, Bind*ByName stubs that just end up proxying * to the params object. */ #define BOILERPLATE_BIND_PROXIES(_class, _optionalGuard) \ BIND_BASE_IMPLS(_class, _optionalGuard) \ BIND_GEN_IMPL(_class, _optionalGuard, UTF8String, \ (const nsACString& aWhere, const nsACString& aValue), \ (uint32_t aWhere, const nsACString& aValue), (aWhere, aValue)) \ BIND_GEN_IMPL(_class, _optionalGuard, String, \ (const nsACString& aWhere, const nsAString& aValue), \ (uint32_t aWhere, const nsAString& aValue), (aWhere, aValue)) \ BIND_GEN_IMPL(_class, _optionalGuard, Double, \ (const nsACString& aWhere, double aValue), \ (uint32_t aWhere, double aValue), (aWhere, aValue)) \ BIND_GEN_IMPL(_class, _optionalGuard, Int32, \ (const nsACString& aWhere, int32_t aValue), \ (uint32_t aWhere, int32_t aValue), (aWhere, aValue)) \ BIND_GEN_IMPL(_class, _optionalGuard, Int64, \ (const nsACString& aWhere, int64_t aValue), \ (uint32_t aWhere, int64_t aValue), (aWhere, aValue)) \ BIND_GEN_IMPL(_class, _optionalGuard, Null, (const nsACString& aWhere), \ (uint32_t aWhere), (aWhere)) \ BIND_GEN_IMPL( \ _class, _optionalGuard, Blob, \ (const nsACString& aWhere, const uint8_t* aValue, uint32_t aValueSize), \ (uint32_t aWhere, const uint8_t* aValue, uint32_t aValueSize), \ (aWhere, aValue, aValueSize)) \ BIND_GEN_IMPL(_class, _optionalGuard, BlobArray, \ (const nsACString& aWhere, const nsTArray& aValue), \ (uint32_t aWhere, const nsTArray& aValue), \ (aWhere, aValue)) \ BIND_GEN_IMPL(_class, _optionalGuard, StringAsBlob, \ (const nsACString& aWhere, const nsAString& aValue), \ (uint32_t aWhere, const nsAString& aValue), (aWhere, aValue)) \ BIND_GEN_IMPL(_class, _optionalGuard, UTF8StringAsBlob, \ (const nsACString& aWhere, const nsACString& aValue), \ (uint32_t aWhere, const nsACString& aValue), (aWhere, aValue)) \ BIND_GEN_IMPL( \ _class, _optionalGuard, AdoptedBlob, \ (const nsACString& aWhere, uint8_t* aValue, uint32_t aValueSize), \ (uint32_t aWhere, uint8_t * aValue, uint32_t aValueSize), \ (aWhere, aValue, aValueSize)) } // namespace storage } // namespace mozilla #endif // mozilla_storage_StorageBaseStatementInternal_h_