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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+interface mozIStorageAggregateFunction;
+interface mozIStorageCompletionCallback;
+interface mozIStorageFunction;
+interface mozIStorageProgressHandler;
+interface mozIStorageBaseStatement;
+interface mozIStorageStatement;
+interface mozIStorageAsyncStatement;
+interface mozIStorageStatementCallback;
+interface mozIStoragePendingStatement;
+interface nsIFile;
+
+/**
+ * mozIStorageAsyncConnection represents an asynchronous database
+ * connection attached to a specific file or to an in-memory data
+ * storage. It is the primary interface for interacting with a
+ * database from the main thread, including creating prepared
+ * statements, executing SQL, and examining database errors.
+ */
+[scriptable, uuid(8bfd34d5-4ddf-4e4b-89dd-9b14f33534c6)]
+interface mozIStorageAsyncConnection : nsISupports {
+ /**
+ * Close this database connection, allowing all pending statements
+ * to complete first.
+ *
+ * @param aCallback [optional]
+ * A callback that will be notified when the close is completed,
+ * with the following arguments:
+ * - status: the status of the call
+ * - value: |null|
+ *
+ * @throws NS_ERROR_NOT_SAME_THREAD
+ * If called on a thread other than the one that opened it. The
+ * callback will not be dispatched.
+ * @throws NS_ERROR_NOT_INITIALIZED
+ * If called on a connection that has already been closed or was
+ * never properly opened. The callback will still be dispatched
+ * to the main thread despite the returned error.
+ */
+ void asyncClose([optional] in mozIStorageCompletionCallback aCallback);
+
+ /**
+ * Clone a database and make the clone read only if needed.
+ * SQL Functions and attached on-disk databases are applied to the new clone.
+ *
+ * @param aReadOnly
+ * If true, the returned database should be put into read-only mode.
+ *
+ * @param aCallback
+ * A callback that will be notified when the operation is complete,
+ * with the following arguments:
+ * - status: the status of the operation
+ * - value: in case of success, an intance of
+ * mozIStorageAsyncConnection cloned from this one.
+ *
+ * @throws NS_ERROR_NOT_SAME_THREAD
+ * If is called on a thread other than the one that opened it.
+ * @throws NS_ERROR_UNEXPECTED
+ * If this connection is a memory database.
+ *
+ * @note If your connection is already read-only, you will get a read-only
+ * clone.
+ * @note Due to a bug in SQLite, if you use the shared cache
+ * (see mozIStorageService), you end up with the same privileges as the
+ * first connection opened regardless of what is specified in aReadOnly.
+ * @note The following pragmas are copied over to a read-only clone:
+ * - cache_size
+ * - temp_store
+ * The following pragmas are copied over to a writeable clone:
+ * - cache_size
+ * - temp_store
+ * - foreign_keys
+ * - journal_size_limit
+ * - synchronous
+ * - wal_autocheckpoint
+ */
+ void asyncClone(in boolean aReadOnly,
+ in mozIStorageCompletionCallback aCallback);
+
+ /**
+ * The current database nsIFile. Null if the database
+ * connection refers to an in-memory database.
+ */
+ readonly attribute nsIFile databaseFile;
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// Statement creation
+
+ /**
+ * Create an asynchronous statement for the given SQL. An
+ * asynchronous statement can only be used to dispatch asynchronous
+ * requests to the asynchronous execution thread and cannot be used
+ * to take any synchronous actions on the database.
+ *
+ * The expression may use ? to indicate sequential numbered arguments,
+ * ?1, ?2 etc. to indicate specific numbered arguments or :name and
+ * $var to indicate named arguments.
+ *
+ * @param aSQLStatement
+ * The SQL statement to execute.
+ * @return a new mozIStorageAsyncStatement
+ * @note The statement is created lazily on first execution.
+ */
+ mozIStorageAsyncStatement createAsyncStatement(in AUTF8String aSQLStatement);
+
+ /**
+ * Execute an array of statements created with this connection using
+ * any currently bound parameters. When the array contains multiple
+ * statements, the execution is wrapped in a single
+ * transaction. These statements can be reused immediately, and
+ * reset does not need to be called.
+ *
+ * @param aStatements
+ * The array of statements to execute asynchronously, in the order they
+ * are given in the array.
+ * @param aNumStatements
+ * The number of statements in aStatements.
+ * @param aCallback [optional]
+ * The callback object that will be notified of progress, errors, and
+ * completion.
+ * @return an object that can be used to cancel the statements execution.
+ *
+ * @note If you have any custom defined functions, they must be
+ * re-entrant since they can be called on multiple threads.
+ */
+ mozIStoragePendingStatement executeAsync(
+ [array, size_is(aNumStatements)] in mozIStorageBaseStatement aStatements,
+ in unsigned long aNumStatements,
+ [optional] in mozIStorageStatementCallback aCallback
+ );
+
+ /**
+ * Execute asynchronously an SQL expression, expecting no arguments.
+ *
+ * @param aSQLStatement
+ * The SQL statement to execute
+ * @param aCallback [optional]
+ * The callback object that will be notified of progress, errors, and
+ * completion.
+ * @return an object that can be used to cancel the statement execution.
+ */
+ mozIStoragePendingStatement executeSimpleSQLAsync(
+ in AUTF8String aSQLStatement,
+ [optional] in mozIStorageStatementCallback aCallback);
+
+ //////////////////////////////////////////////////////////////////////////////
+ //// Functions
+
+ /**
+ * Create a new SQL function. If you use your connection on multiple threads,
+ * your function needs to be threadsafe, or it should only be called on one
+ * thread.
+ *
+ * @param aFunctionName
+ * The name of function to create, as seen in SQL.
+ * @param aNumArguments
+ * The number of arguments the function takes. Pass -1 for
+ * variable-argument functions.
+ * @param aFunction
+ * The instance of mozIStorageFunction, which implements the function
+ * in question.
+ */
+ void createFunction(in AUTF8String aFunctionName,
+ in long aNumArguments,
+ in mozIStorageFunction aFunction);
+
+ /**
+ * Create a new SQL aggregate function. If you use your connection on
+ * multiple threads, your function needs to be threadsafe, or it should only
+ * be called on one thread.
+ *
+ * @param aFunctionName
+ * The name of aggregate function to create, as seen in SQL.
+ * @param aNumArguments
+ * The number of arguments the function takes. Pass -1 for
+ * variable-argument functions.
+ * @param aFunction
+ * The instance of mozIStorageAggreagteFunction, which implements the
+ * function in question.
+ */
+ void createAggregateFunction(in AUTF8String aFunctionName,
+ in long aNumArguments,
+ in mozIStorageAggregateFunction aFunction);
+ /**
+ * Delete custom SQL function (simple or aggregate one).
+ *
+ * @param aFunctionName
+ * The name of function to remove.
+ */
+ void removeFunction(in AUTF8String aFunctionName);
+
+ /**
+ * Sets a progress handler. Only one handler can be registered at a time.
+ * If you need more than one, you need to chain them yourself. This progress
+ * handler should be threadsafe if you use this connection object on more than
+ * one thread.
+ *
+ * @param aGranularity
+ * The number of SQL virtual machine steps between progress handler
+ * callbacks.
+ * @param aHandler
+ * The instance of mozIStorageProgressHandler.
+ * @return previous registered handler.
+ */
+ mozIStorageProgressHandler setProgressHandler(in int32_t aGranularity,
+ in mozIStorageProgressHandler aHandler);
+
+ /**
+ * Remove a progress handler.
+ *
+ * @return previous registered handler.
+ */
+ mozIStorageProgressHandler removeProgressHandler();
+};