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https://issues.apache.org/jira/browse/CB-10960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229974#comment-15229974
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Sergey Shakhnazarov commented on CB-10960:
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{{FileWriter.write}} first extracts a Blob data asynchronously using FileReader
=> the {{write}} method returns instantly and the {{while (
!(logWriter.readyState === FileWriter.WRITING) ) }} condition does not have an
effect.
I.e. all the Blob write operations starts simultaneously instead of being
queued and FileWriter then throws {{FileError.INVALID_STATE_ERR}} when
concurrent Blob content read operations finishes (and their results are trying
to be appended to the file).
The solution to this issue is to switch readyState to FileWriter.WRITING before
starting async Blob read and to handle this specific case in the recursive
write call later - I'll send a PR shortly.
> Uncaught #<FileError> in write() when readyState != WRITING ?
> -------------------------------------------------------------
>
> Key: CB-10960
> URL: https://issues.apache.org/jira/browse/CB-10960
> Project: Apache Cordova
> Issue Type: Bug
> Components: Plugin File
> Affects Versions: 4.1.1
> Environment: Android
> Reporter: Samo Dadela
> Labels: android
> Attachments: code.js
>
>
> Excuse me if I did something stupid - I'm new to Cordova and JS.
> I thought that calling write() after checking readyState != WRITING would
> work.
> {code}
> function writeQueue(c) {
> while ( !(logWriter.readyState === FileWriter.WRITING) ) {
> var msg = logQueue.dequeue();
> if (!msg) {
> return;
> }
> var blob = new Blob([msg+c], { type: 'text/plain' });
> logWriter.write(blob);
> }
> }
> }
> {code}
> But I get:
> 0 277161 log log writer: cdvfile://localhost/files/bala.log
> 1 277199 log log writer: onwriteend
> 2 283616 log log writer: onwriteend
> 3 283629 log log writer: onwriteend
> 4 283651 error Uncaught #<FileError>,
> http://192.168.1.200:8100/plugins/cordova-plugin-file/www/FileWriter.js,
> Line: 130
> Line 130 is:
> {code}
> // Throw an exception if we are already writing a file
> if (this.readyState === FileWriter.WRITING) {
> throw new FileError(FileError.INVALID_STATE_ERR);
> }
> {code}
> How can readyState change to WRITING ?
> Note: Queue is pure Javascript
> (http://code.stephenmorley.org/javascript/queues/Queue.src.js)
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