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98 lines
3.9 KiB
Plaintext
98 lines
3.9 KiB
Plaintext
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsITransport;
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interface nsIInputStream;
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interface nsIOutputStream;
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/**
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* This service read/writes a stream on a background thread.
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*
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* Use this service to transform any blocking stream (e.g., file stream)
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* into a fully asynchronous stream that can be read/written without
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* blocking the main thread.
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*/
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[scriptable, uuid(51CAC889-ABC6-4948-97A3-4F135A6E7630)]
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interface nsIStreamTransportService : nsISupports
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{
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/**
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* CreateInputTransport
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*
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* @param aStream
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* The input stream that will be read on a background thread.
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* This stream must implement "blocking" stream semantics.
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* @param aStartOffset
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* The input stream will be read starting from this offset. Pass
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* -1 to read from the current stream offset. NOTE: this parameter
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* is ignored if the stream does not support nsISeekableStream.
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* @param aReadLimit
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* This parameter limits the number of bytes that will be read from
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* the input stream. Pass -1 to read everything.
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* @param aCloseWhenDone
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* Specify this flag to have the input stream closed once its
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* contents have been completely read.
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*
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* @return nsITransport instance.
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*/
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nsITransport createInputTransport(in nsIInputStream aStream,
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in long long aStartOffset,
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in long long aReadLimit,
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in boolean aCloseWhenDone);
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/**
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* CreateOutputTransport
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*
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* @param aStream
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* The output stream that will be written to on a background thread.
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* This stream must implement "blocking" stream semantics.
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* @param aStartOffset
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* The output stream will be written starting at this offset. Pass
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* -1 to write to the current stream offset. NOTE: this parameter
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* is ignored if the stream does not support nsISeekableStream.
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* @param aWriteLimit
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* This parameter limits the number of bytes that will be written to
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* the output stream. Pass -1 for unlimited writing.
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* @param aCloseWhenDone
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* Specify this flag to have the output stream closed once its
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* contents have been completely written.
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*
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* @return nsITransport instance.
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*/
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nsITransport createOutputTransport(in nsIOutputStream aStream,
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in long long aStartOffset,
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in long long aWriteLimit,
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in boolean aCloseWhenDone);
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/**
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* Raise the maximum number of active threads by one.
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*
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* Calling this method won't create any additional thread synchronously.
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* It will be only created when it's needed (lazily).
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*
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* Used by mozilla::dom::file::FileService to increase the maximum number
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* of active threads in the thread pool for asynchronous file IO.
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*/
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void raiseThreadLimit();
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/**
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* Lower the maximum number of active threads by one.
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* lowerThreadLimit() should be always paired with raiseThreadLimit().
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*
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* Calling this method won't destroy any already running thread
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* synchronously. It will be only destroyed when it's done with
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* currently running event.
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*
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* This will never lower the maximum number of active threads beyond
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* the internal limit.
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*
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* @throws NS_ERROR_UNEXPECTED
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* When trying to lower the maximum number of active threads
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* beyond the internal limit (for example in the case of badly
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* nested calls)
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*/
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void lowerThreadLimit();
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};
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