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* Async/Await demos

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This commit is contained in:
michael 2020-05-28 08:10:50 +00:00
parent bed2ddb8f2
commit 16ebfa97cd
13 changed files with 440 additions and 1 deletions
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8
demo/Makefile
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@ -6,7 +6,7 @@ TARGETS=democomponents demobrowseconsole demoajax demoxhr restbridgeclient \
chartjs_democustompoints chartjs_demopolararea promiseall promisestory1 \ chartjs_democustompoints chartjs_demopolararea promiseall promisestory1 \
promisestory2 promisestory demodb demoload demorest fpcunitbrowsertest \ promisestory2 promisestory demodb demoload demorest fpcunitbrowsertest \
sampleda webgl1 pdfbasic hotreload dynload bootstraptable fullcalendar \ sampleda webgl1 pdfbasic hotreload dynload bootstraptable fullcalendar \
jitsimeet opentok jitsimeet opentok asyncmany asyncfetch asyncmanualpromise
ifneq ($(SKIPWEBCOMPILER),1) ifneq ($(SKIPWEBCOMPILER),1)
TARGETS:=$(TARGETS) demowebcompiler TARGETS:=$(TARGETS) demowebcompiler
@ -116,3 +116,9 @@ jitsimeet: ./jitsimeet/demojitsimeet.lpr
$(BROWSERP2JS) $< $(BROWSERP2JS) $<
opentok: ./opentok/demoopentok.lpr opentok: ./opentok/demoopentok.lpr
$(BROWSERP2JS) $< $(BROWSERP2JS) $<
asyncmany: ./asyncawait/trymany.lpr
$(BROWSERP2JS) $<
asyncfetch: ./asyncawait/tryfetch.lpr
$(BROWSERP2JS) $<
asyncmanualpromise: ./asyncawait/manualpromise.lpr
$(BROWSERP2JS) $<

6
demo/asyncawait/description.txt Normal file
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@ -0,0 +1,6 @@
This example fetches 3 files, and waits for all 3 fetches to be completion
using the TJSPromise.All() function.
Since there are 3 promises, the result is an array with 3 results.

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13
demo/asyncawait/manualpromise.html Normal file
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<html>
<head>
<title>Manual promise demo</title>
<script type="application/javascript" src="manualpromise.js"></script>
</head>
<body>
<div id="pasjsconsole"></div>
<script type="application/javascript">
rtl.run();
</script>
</body>
</html>

84
demo/asyncawait/manualpromise.lpi Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<CONFIG>
<ProjectOptions>
<Version Value="12"/>
<General>
<Flags>
<MainUnitHasCreateFormStatements Value="False"/>
<MainUnitHasTitleStatement Value="False"/>
<MainUnitHasScaledStatement Value="False"/>
<Runnable Value="False"/>
</Flags>
<SessionStorage Value="InProjectDir"/>
<Title Value="manualpromise"/>
<UseAppBundle Value="False"/>
<ResourceType Value="res"/>
</General>
<CustomData Count="2">
<Item0 Name="PasJSPort" Value="0"/>
<Item1 Name="PasJSWebBrowserProject" Value="1"/>
</CustomData>
<BuildModes>
<Item Name="Default" Default="True"/>
</BuildModes>
<PublishOptions>
<Version Value="2"/>
<UseFileFilters Value="True"/>
</PublishOptions>
<RunParams>
<FormatVersion Value="2"/>
</RunParams>
<Units>
<Unit>
<Filename Value="manualpromise.lpr"/>
<IsPartOfProject Value="True"/>
</Unit>
<Unit>
<Filename Value="manualpromise.html"/>
<IsPartOfProject Value="True"/>
</Unit>
</Units>
</ProjectOptions>
<CompilerOptions>
<Version Value="11"/>
<Target FileExt=".js">
<Filename Value="manualpromise"/>
</Target>
<SearchPaths>
<UnitOutputDirectory Value="js"/>
</SearchPaths>
<Parsing>
<SyntaxOptions>
<AllowLabel Value="False"/>
<CPPInline Value="False"/>
<UseAnsiStrings Value="False"/>
</SyntaxOptions>
</Parsing>
<CodeGeneration>
<TargetOS Value="browser"/>
</CodeGeneration>
<Linking>
<Debugging>
<GenerateDebugInfo Value="False"/>
<UseLineInfoUnit Value="False"/>
</Debugging>
</Linking>
<Other>
<CustomOptions Value="-Jeutf-8 -Jirtl.js -Jc -Jminclude"/>
<CompilerPath Value="$(pas2js)"/>
</Other>
</CompilerOptions>
<Debugging>
<Exceptions>
<Item>
<Name Value="EAbort"/>
</Item>
<Item>
<Name Value="ECodetoolError"/>
</Item>
<Item>
<Name Value="EFOpenError"/>
</Item>
</Exceptions>
</Debugging>
</CONFIG>

34
demo/asyncawait/manualpromise.lpr Normal file
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@ -0,0 +1,34 @@
Program manualpromise;
uses browserconsole, JS, Web;
function ResolveAfter2Seconds: TJSPromise;
// returns immediately with a Promise,
// which after 2 seconds gets resolved
begin
Result:=TJSPromise.new(procedure(resolve, reject : TJSPromiseResolver)
begin
window.setTimeout(procedure
begin
resolve('resolved');
end,
2000); // wait 2 seconds
end);
end;
procedure AsyncCall; async;
var s: string;
begin
writeln('calling');
s := await(string,resolveAfter2Seconds());
// the await pauses this procedure returning to the caller
// when the Promise from resolveAfter2Seconds gets resolved
// this procedure is continued
writeln(s); // expected output: 'resolved'
end;
begin
AsyncCall;
// calling AsyncCall returns immediately, while the Promise is waiting
writeln('called');
end.

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13
demo/asyncawait/tryfetch.html Normal file
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<html>
<head>
<title>fetch demo with async/await</title>
<script type="application/javascript" src="tryfetch.js"></script>
</head>
<body>
<div id="pasjsconsole"></div>
<script type="application/javascript">
rtl.run();
</script>
</body>
</html>

84
demo/asyncawait/tryfetch.lpi Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<CONFIG>
<ProjectOptions>
<Version Value="12"/>
<General>
<Flags>
<MainUnitHasCreateFormStatements Value="False"/>
<MainUnitHasTitleStatement Value="False"/>
<MainUnitHasScaledStatement Value="False"/>
<Runnable Value="False"/>
</Flags>
<SessionStorage Value="InProjectDir"/>
<Title Value="tryfetch"/>
<UseAppBundle Value="False"/>
<ResourceType Value="res"/>
</General>
<CustomData Count="2">
<Item0 Name="PasJSPort" Value="0"/>
<Item1 Name="PasJSWebBrowserProject" Value="1"/>
</CustomData>
<BuildModes>
<Item Name="Default" Default="True"/>
</BuildModes>
<PublishOptions>
<Version Value="2"/>
<UseFileFilters Value="True"/>
</PublishOptions>
<RunParams>
<FormatVersion Value="2"/>
</RunParams>
<Units>
<Unit>
<Filename Value="tryfetch.lpr"/>
<IsPartOfProject Value="True"/>
</Unit>
<Unit>
<Filename Value="tryfetch.html"/>
<IsPartOfProject Value="True"/>
</Unit>
</Units>
</ProjectOptions>
<CompilerOptions>
<Version Value="11"/>
<Target FileExt=".js">
<Filename Value="tryfetch"/>
</Target>
<SearchPaths>
<UnitOutputDirectory Value="js"/>
</SearchPaths>
<Parsing>
<SyntaxOptions>
<AllowLabel Value="False"/>
<CPPInline Value="False"/>
<UseAnsiStrings Value="False"/>
</SyntaxOptions>
</Parsing>
<CodeGeneration>
<TargetOS Value="browser"/>
</CodeGeneration>
<Linking>
<Debugging>
<GenerateDebugInfo Value="False"/>
<UseLineInfoUnit Value="False"/>
</Debugging>
</Linking>
<Other>
<CustomOptions Value="-Jeutf-8 -Jirtl.js -Jc -Jminclude"/>
<CompilerPath Value="$(pas2js)"/>
</Other>
</CompilerOptions>
<Debugging>
<Exceptions>
<Item>
<Name Value="EAbort"/>
</Item>
<Item>
<Name Value="ECodetoolError"/>
</Item>
<Item>
<Name Value="EFOpenError"/>
</Item>
</Exceptions>
</Debugging>
</CONFIG>

34
demo/asyncawait/tryfetch.lpr Normal file
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@ -0,0 +1,34 @@
program tryfetch;
{$mode objfpc}
uses
browserconsole, JS, Web, SysUtils;
procedure myFetch; async;
var
response: TJSResponse;
myBlob: TJSBlob;
image: TJSHTMLImageElement;
objectURL: string;
begin
try
response := await(window.fetch('pas2js.png'));
if not response.ok then
raise Exception.Create('HTTP error! status: '+str(response.status))
else begin
myBlob := await(response.blob());
objectURL := TJSURL.createObjectURL(myBlob);
image := TJSHTMLImageElement(document.createElement('img'));
image.src := objectURL;
document.body.appendChild(image);
end;
except
console.log(JSExceptValue);
end;
end;
begin
myFetch;
end.

13
demo/asyncawait/trymany.html Normal file
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@ -0,0 +1,13 @@
<html>
<head>
<title>multiple fetch demo with async/await and TJSPromise.All</title>
<script type="application/javascript" src="trymany.js"></script>
</head>
<body>
<div id="pasjsconsole"></div>
<script type="application/javascript">
rtl.run();
</script>
</body>
</html>

85
demo/asyncawait/trymany.lpi Normal file
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@ -0,0 +1,85 @@
<?xml version="1.0" encoding="UTF-8"?>
<CONFIG>
<ProjectOptions>
<Version Value="12"/>
<General>
<Flags>
<MainUnitHasCreateFormStatements Value="False"/>
<MainUnitHasTitleStatement Value="False"/>
<MainUnitHasScaledStatement Value="False"/>
<Runnable Value="False"/>
</Flags>
<SessionStorage Value="InProjectDir"/>
<Title Value="trymany"/>
<UseAppBundle Value="False"/>
<ResourceType Value="res"/>
</General>
<CustomData Count="2">
<Item0 Name="PasJSPort" Value="0"/>
<Item1 Name="PasJSWebBrowserProject" Value="1"/>
</CustomData>
<BuildModes>
<Item Name="Default" Default="True"/>
</BuildModes>
<PublishOptions>
<Version Value="2"/>
<UseFileFilters Value="True"/>
</PublishOptions>
<RunParams>
<FormatVersion Value="2"/>
</RunParams>
<Units>
<Unit>
<Filename Value="trymany.lpr"/>
<IsPartOfProject Value="True"/>
<UnitName Value="tryfetchmany"/>
</Unit>
<Unit>
<Filename Value="trymany.html"/>
<IsPartOfProject Value="True"/>
</Unit>
</Units>
</ProjectOptions>
<CompilerOptions>
<Version Value="11"/>
<Target FileExt=".js">
<Filename Value="trymany"/>
</Target>
<SearchPaths>
<UnitOutputDirectory Value="js"/>
</SearchPaths>
<Parsing>
<SyntaxOptions>
<AllowLabel Value="False"/>
<CPPInline Value="False"/>
<UseAnsiStrings Value="False"/>
</SyntaxOptions>
</Parsing>
<CodeGeneration>
<TargetOS Value="browser"/>
</CodeGeneration>
<Linking>
<Debugging>
<GenerateDebugInfo Value="False"/>
<UseLineInfoUnit Value="False"/>
</Debugging>
</Linking>
<Other>
<CustomOptions Value="-Jeutf-8 -Jirtl.js -Jc -Jminclude"/>
<CompilerPath Value="$(pas2js)"/>
</Other>
</CompilerOptions>
<Debugging>
<Exceptions>
<Item>
<Name Value="EAbort"/>
</Item>
<Item>
<Name Value="ECodetoolError"/>
</Item>
<Item>
<Name Value="EFOpenError"/>
</Item>
</Exceptions>
</Debugging>
</CONFIG>

67
demo/asyncawait/trymany.lpr Normal file
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@ -0,0 +1,67 @@
program tryfetchmany;
{$mode objfpc}
uses
browserconsole, JS, Web, SysUtils, Types;
function FetchBlob(url: string): TJSBlob; async;
var
response: TJSResponse;
begin
response := await(window.fetch(url));
if not response.ok then
raise Exception.create('HTTP error! status: '+str(response.status))
else
Result:=await(response.blob());
end;
function FetchText(url: string): string; async;
var
response: TJSResponse;
begin
response := await(window.fetch(url));
if not response.ok then
raise Exception.create('HTTP error! status: '+str(response.status))
else
Result:=await(response.text());
end;
procedure DisplayContent; async;
var
coffee, tea, description: TJSPromise;
objectURL1, objectURL2, descText: String;
values: TJSValueDynArray;
image1, image2: TJSHTMLImageElement;
para: TJSHTMLElement;
begin
try
coffee := FetchBlob('pas2js.png');
tea := FetchBlob('fpc.png');
description := FetchText('description.txt');
values := await(TJSValueDynArray,TJSPromise.all([coffee, tea, description]));
objectURL1 := TJSURL.createObjectURL(values[0]);
objectURL2 := TJSURL.createObjectURL(values[1]);
descText := string(values[2]);
image1 := TJSHTMLImageElement(document.createElement('img'));
image2 := TJSHTMLImageElement(document.createElement('img'));
image1.src := objectURL1;
image2.src := objectURL2;
document.body.appendChild(image1);
document.body.appendChild(image2);
para := TJSHTMLElement(document.createElement('p'));
para.textContent := descText;
document.body.appendChild(para);
except
writeln(JSExceptValue);
end;
end;
begin
DisplayContent;
end.