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+/* 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 "nsIRequest.idl"
+
+interface nsIInputStream;
+interface nsISerialEventTarget;
+interface nsIStreamListener;
+
+/**
+ * nsIInputStreamPump
+ *
+ * This interface provides a means to configure and use a input stream pump
+ * instance. The input stream pump will asynchronously read from an input
+ * stream, and push data to an nsIStreamListener instance. It utilizes the
+ * current thread's nsIEventTarget in order to make reading from the stream
+ * asynchronous. A different thread can be used if the pump also implements
+ * nsIThreadRetargetableRequest.
+ *
+ * If the given stream supports nsIAsyncInputStream, then the stream pump will
+ * call the stream's AsyncWait method to drive the stream listener. Otherwise,
+ * the stream will be read on a background thread utilizing the stream
+ * transport service. More details are provided below.
+ */
+[scriptable, uuid(400F5468-97E7-4d2b-9C65-A82AECC7AE82)]
+interface nsIInputStreamPump : nsIRequest
+{
+ /**
+ * Initialize the input stream pump.
+ *
+ * @param aStream
+ * contains the data to be read. if the input stream is non-blocking,
+ * then it will be QI'd to nsIAsyncInputStream. if the QI succeeds
+ * then the stream will be read directly. otherwise, it will be read
+ * on a background thread using the stream transport service.
+ * @param aSegmentSize
+ * if the stream transport service is used, then this parameter
+ * specifies the segment size for the stream transport's buffer.
+ * pass 0 to specify the default value.
+ * @param aSegmentCount
+ * if the stream transport service is used, then this parameter
+ * specifies the segment count for the stream transport's buffer.
+ * pass 0 to specify the default value.
+ * @param aCloseWhenDone
+ * if true, the input stream will be closed after it has been read.
+ * @param aMainThreadTarget
+ * a labeled main therad event target.
+ */
+ void init(in nsIInputStream aStream,
+ in unsigned long aSegmentSize,
+ in unsigned long aSegmentCount,
+ in boolean aCloseWhenDone,
+ [optional] in nsISerialEventTarget aMainThreadTarget);
+
+ /**
+ * asyncRead causes the input stream to be read in chunks and delivered
+ * asynchronously to the listener via OnDataAvailable.
+ *
+ * @param aListener
+ * receives notifications.
+ * @param aListenerContext
+ * passed to listener methods.
+ */
+ void asyncRead(in nsIStreamListener aListener);
+};