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process-queue
Advanced tools
A simple, but flexible process queue.
// make our queue
var q = require('process-queue').createQueue({
// how many processes should be allowed to run at a time
concurrency: Number($) || 1,
interposers: {
// used to alter the parameters given to push($)
parameters: function(cmd, cb(err, cmd)) || noop
// used to alter the child process after spawning
child: function(child, cb(err, child)) || noop
},
// used to alter the spawning of a child process
// default behavior is child_process.spawn()
// by this point all params to push may have been cached
// changes to cmd will have no effect
spawner: function(cmd, cb(err, child)) || noop
});
var cmd = {
spawnOptions: ['cat', ['-n',], {}]
};
q.push(cmd, function (err) {
// only has error if child fired an error event or exited with non-zero status
console.log(err);
});
// wrapping only affects interposers
// this is to avoid hijacking spawning logic
logged_q = q.wrap({
parameters: function (cmd, next) {
console.error('QUEUED', cmd);
next(null, cmd);
},
child: function (child, next) {
console.error('CHILD CREATED WITH PID: %d', child.pid);
next(null, child);
}
})
Interposers must give a value to callbacks even if the value is unchanged
FAQs
child process queues managed for interposition
The npm package process-queue receives a total of 1 weekly downloads. As such, process-queue popularity was classified as not popular.
We found that process-queue demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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