What we want to achieve is to add artificial delay between window and sink operators to postpone sink emition. It is located in one region (with a read replica in a different region)īecause we are using event time characteristics with 1 minute tumbling window all regions' sink emit their records nearly at the same time.It is hosted in AWS via RDS (currently it is a PostgreSQL).The exact same code is running in each region.It is hosted in AWS via Kinesis Data Analytics (KDA).The application emits the data into a Postgres sink.So, for each session we will have 1 computed record.The windowing is specified by a reduce and a process functions.The application has windowing with 1 minute tumbling window.The application shards ( keyBy) events based on the sessionId field. ![]() The application uses event time characteristics.So, here’s the final version of text-to-speech.We have an Apache Flink application which processes events Now, we are done with all the controls and we already set up the required properties. document.querySelector("#start").addEventListener("click", () => ) We should retrieve the text value from the textarea and set it to this property when the button is clicked. The text property must be set when the start button is pressed in our example. The text can be sent in plain text format. When the utterance is spoken, the text property obtains and sets the text that will be synthesized. If unset, the lang value will be used, or the user-agent default if the lang is not available. The language property obtains and sets the utterance’s language. There are six properties on the SpeechSynthesisUtterance interface that we can tweak. ![]() After creating an object for this interface, we provide it to the speak() method of the SpeechSynthesis object to play the speech. This is the interface where we really produce the speech or utterance from the text provided, including language type, volume, voice pitch, rate of speech, and so on. JavaScript SpeechSynthesisUtterance Interface We will understand this more when we jump into the code. The speak() method is called on the voice synthesis controller interface, which is referenced by this property of the JavaScript window object. JavaScript window.speechSynthesis Property
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