@cleerlycode/cornerstone-wado-image-loader
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Cornerstone ImageLoader for DICOM WADO-URI
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<h2><a href="index.html">Home</a></h2><h3>Global</h3><ul><li><a href="global.html#addTask">addTask</a></li><li><a href="global.html#arrayBufferToString">arrayBufferToString</a></li><li><a href="global.html#cacheSizeInBytes">cacheSizeInBytes</a></li><li><a href="global.html#cancelTask">cancelTask</a></li><li><a href="global.html#framesAreFragmented">framesAreFragmented</a></li><li><a href="global.html#getNumberString">getNumberString</a></li><li><a href="global.html#getNumberValues">getNumberValues</a></li><li><a href="global.html#getStatistics">getStatistics</a></li><li><a href="global.html#getTransferSyntaxForContentType">getTransferSyntaxForContentType</a></li><li><a href="global.html#getUncompressedImageFrame">getUncompressedImageFrame</a></li><li><a href="global.html#getValue">getValue</a></li><li><a href="global.html#handleMessageFromWorker">handleMessageFromWorker</a></li><li><a href="global.html#handler">handler</a></li><li><a href="global.html#initialize">initialize</a></li><li><a href="global.html#loadCodecs">loadCodecs</a></li><li><a href="global.html#loadWebWorkerTask">loadWebWorkerTask</a></li><li><a href="global.html#registerLoaders">registerLoaders</a></li><li><a href="global.html#registerTaskHandler">registerTaskHandler</a></li><li><a href="global.html#setPixelDataType">setPixelDataType</a></li><li><a href="global.html#setTaskPriority">setTaskPriority</a></li><li><a href="global.html#spawnWebWorker">spawnWebWorker</a></li><li><a href="global.html#startTaskOnWebWorker">startTaskOnWebWorker</a></li><li><a href="global.html#unpackBinaryFrame">unpackBinaryFrame</a></li></ul>
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<h1 class="page-title">webWorker/webWorker.js</h1>
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<pre class="prettyprint source linenums"><code>// an object of task handlers
const taskHandlers = {};
// Flag to ensure web worker is only initialized once
let initialized = false;
// the configuration object passed in when the web worker manager is initialized
let config;
/**
* Initialization function that loads additional web workers and initializes them
* @param data
*/
function initialize (data) {
// console.log('web worker initialize ', data.workerIndex);
// prevent initialization from happening more than once
if (initialized) {
return;
}
// save the config data
config = data.config;
// load any additional web worker tasks
if (data.config.webWorkerTaskPaths) {
for (let i = 0; i < data.config.webWorkerTaskPaths.length; i++) {
self.importScripts(data.config.webWorkerTaskPaths[i]);
}
}
// initialize each task handler
Object.keys(taskHandlers).forEach(function (key) {
taskHandlers[key].initialize(config.taskConfiguration);
});
// tell main ui thread that we have completed initialization
self.postMessage({
taskType: 'initialize',
status: 'success',
result: {
},
workerIndex: data.workerIndex
});
initialized = true;
}
/**
* Function exposed to web worker tasks to register themselves
* @param taskHandler
*/
export function registerTaskHandler (taskHandler) {
if (taskHandlers[taskHandler.taskType]) {
console.log('attempt to register duplicate task handler "', taskHandler.taskType, '"');
return false;
}
taskHandlers[taskHandler.taskType] = taskHandler;
if (initialized) {
taskHandler.initialize(config.taskConfiguration);
}
}
/**
* Function to load a new web worker task with updated configuration
* @param data
*/
function loadWebWorkerTask (data) {
config = data.config;
self.importScripts(data.sourcePath);
}
/**
* Web worker message handler - dispatches messages to the registered task handlers
* @param msg
*/
self.onmessage = function (msg) {
// console.log('web worker onmessage', msg.data);
// handle initialize message
if (msg.data.taskType === 'initialize') {
initialize(msg.data);
return;
}
// handle loadWebWorkerTask message
if (msg.data.taskType === 'loadWebWorkerTask') {
loadWebWorkerTask(msg.data);
return;
}
// dispatch the message if there is a handler registered for it
if (taskHandlers[msg.data.taskType]) {
taskHandlers[msg.data.taskType].handler(msg.data, function (result, transferList) {
self.postMessage({
taskType: msg.data.taskType,
status: 'success',
result,
workerIndex: msg.data.workerIndex
}, transferList);
});
return;
}
// not task handler registered - send a failure message back to ui thread
console.log('no task handler for ', msg.data.taskType);
console.log(taskHandlers);
self.postMessage({
taskType: msg.data.taskType,
status: 'failed - no task handler registered',
workerIndex: msg.data.workerIndex
});
};
</code></pre>
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