Diffusion Ant (mir/gc) Code

ant/tests/test_closure_forwarder_reentrant_callbacks.cjs
445f58992868mir/gc

test_closure_forwarder_reentrant_callbacks.cjs
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			function afterTransform(er, data) {
			const ts = this._transformState;
			ts.transforming = false;
			const cb = ts.writecb;
			if (cb === null) throw new Error('multiple callback');
			ts.writechunk = null;
			ts.writecb = null;
			cb(er);
			const rs = this._readableState;
			rs.reading = false;
			if (rs.needReadable \|\| rs.length < rs.highWaterMark) {
			this._read(rs.highWaterMark);
			}
			}

			function doWrite(stream, state, len, chunk, encoding, cb) {
			state.writelen = len;
			state.writecb = cb;
			state.writing = true;
			stream._write(chunk, encoding, state.onwrite);
			}

			function onwriteStateUpdate(state) {
			state.writing = false;
			state.writecb = null;
			state.length -= state.writelen;
			state.writelen = 0;
			}

			function afterWrite(stream, state, cb) {
			state.pendingcb--;
			cb();
			}

			function clearBuffer(stream, state) {
			state.bufferProcessing = true;
			let entry = state.bufferedRequest;
			while (entry) {
			const chunk = entry.chunk;
			const encoding = entry.encoding;
			const cb = entry.callback;
			const len = chunk.length;
			doWrite(stream, state, len, chunk, encoding, cb);
			entry = entry.next;
			state.bufferedRequestCount--;
			if (state.writing) break;
			}
			if (entry === null) state.lastBufferedRequest = null;
			state.bufferedRequest = entry;
			state.bufferProcessing = false;
			}

			function onwrite(stream, er) {
			const state = stream._writableState;
			const cb = state.writecb;
			if (typeof cb !== 'function') throw new Error('bad cb');
			onwriteStateUpdate(state);
			if (er) throw er;
			if (!state.corked && !state.bufferProcessing && state.bufferedRequest) {
			clearBuffer(stream, state);
			}
			afterWrite(stream, state, cb);
			}

			function onwriteForward(er) {
			return onwrite(onwriteForward.owner, er);
			}

			function afterTransformForward(er, data) {
			return afterTransform.call(afterTransformForward.owner, er, data);
			}

			function writeOrBuffer(stream, state, chunk, encoding, cb) {
			const len = chunk.length;
			state.length += len;
			if (state.writing \|\| state.corked) {
			const req = { chunk, encoding, callback: cb, next: null };
			const last = state.lastBufferedRequest;
			state.lastBufferedRequest = req;
			if (last) last.next = req;
			else state.bufferedRequest = req;
			state.bufferedRequestCount++;
			} else {
			doWrite(stream, state, len, chunk, encoding, cb);
			}
			return true;
			}

			function makeState(owner, onwriteFn, afterTransformFn) {
			owner._readableState = {
			needReadable: true,
			reading: false,
			length: 0,
			highWaterMark: 16,
			};
			owner._transformState = {
			afterTransform: afterTransformFn,
			needTransform: false,
			transforming: false,
			writecb: null,
			writechunk: null,
			writeencoding: null,
			};
			owner._writableState = {
			length: 0,
			highWaterMark: 16,
			writing: false,
			corked: 0,
			bufferProcessing: false,
			writecb: null,
			writelen: 0,
			bufferedRequest: null,
			lastBufferedRequest: null,
			bufferedRequestCount: 0,
			pendingcb: 0,
			onwrite: onwriteFn,
			};
			}

			function ClosureForwardingTransformLike() {
			makeState(
			this,
			(er) => onwrite(this, er),
			(er, data) => afterTransform.call(this, er, data),
			);
			}

			function OwnerForwardingTransformLike() {
			makeState(this, onwriteForward, afterTransformForward);
			this._writableState.onwrite.owner = this;
			this._transformState.afterTransform.owner = this;
			}

			ClosureForwardingTransformLike.prototype.write = OwnerForwardingTransformLike.prototype.write =
			function(chunk, cb) {
			const state = this._writableState;
			state.pendingcb++;
			return writeOrBuffer(this, state, chunk, 'utf8', cb);
			};

			ClosureForwardingTransformLike.prototype._write = OwnerForwardingTransformLike.prototype._write =
			function(chunk, encoding, cb) {
			const ts = this._transformState;
			ts.writecb = cb;
			ts.writechunk = chunk;
			ts.writeencoding = encoding;
			if (!ts.transforming) {
			const rs = this._readableState;
			if (ts.needTransform \|\| rs.needReadable \|\| rs.length < rs.highWaterMark) {
			this._read(rs.highWaterMark);
			}
			}
			};

			ClosureForwardingTransformLike.prototype._read = OwnerForwardingTransformLike.prototype._read =
			function() {
			const ts = this._transformState;
			if (ts.writechunk !== null && !ts.transforming) {
			ts.transforming = true;
			this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
			} else {
			ts.needTransform = true;
			}
			};

			ClosureForwardingTransformLike.prototype._transform = OwnerForwardingTransformLike.prototype._transform =
			function(chunk, encoding, cb) {
			cb(null, chunk);
			};

			function exercise(instance, count) {
			let callbacks = 0;

			for (let i = 0; i < count; i++) {
			instance.write('x', (err) => {
			if (err) throw err;
			callbacks++;
			});
			}

			if (callbacks !== count) {
			throw new Error(`expected ${count} callbacks, got ${callbacks}`);
			}
			}

			exercise(new OwnerForwardingTransformLike(), 512);
			exercise(new ClosureForwardingTransformLike(), 128);

			console.log('closure forwarder reentrant callbacks ok');

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