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allow highWaterMark to be passed to write streams
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Original file line number | Diff line number | Diff line change |
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var Timedsource = require('./timedsource'); | ||
var tilelive = require('..'); | ||
var progress = require('progress-stream'); | ||
var util = require('util'); | ||
var setConcurrency = require('../lib/stream-util').setConcurrency; | ||
|
||
var max = 9; | ||
var readSpeed = 100; | ||
var readsPerWrite = 5; | ||
var numReads = 0; | ||
var numWrites = 0; | ||
var numDrains = 0; | ||
var writeHighWater = 1; //2 * setConcurrency(); | ||
var startTime = Infinity; | ||
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||
console.log( | ||
'Calculated concurrency: %s - Write stream high water mark: %s - Target write speed: %s/s', | ||
setConcurrency(), writeHighWater, 60 * 1000 / (readSpeed * readsPerWrite) | ||
); | ||
|
||
function report() { | ||
var writesPerSecond = Math.floor(numWrites / (Date.now() - startTime) * 1000); | ||
var readsPerSecond = Math.floor(numReads / (Date.now() - startTime) * 1000); | ||
util.print( | ||
util.format( | ||
'\r\033[KReads: %s - Writes: %s - Queued: %s - Drains: %s - Write concurrency: %s - Write speed: %s/s - Read speed: %s/s', | ||
numReads, numWrites, write._writableState.buffer.length, numDrains, write._multiwriting, writesPerSecond, readsPerSecond | ||
) | ||
); | ||
} | ||
|
||
var readsource = new Timedsource({ time: readSpeed, maxzoom: max }); | ||
var read = tilelive.createReadStream(readsource, { type: 'scanline' }); | ||
var readProgress = progress({ | ||
objectMode: true, | ||
length: Math.pow(4, max), | ||
time: 1 | ||
}, function(prog) { | ||
if (prog.transferred > numReads) { | ||
numReads = prog.transferred; | ||
} | ||
}); | ||
readProgress.once('progress', function() { | ||
startTime = Date.now(); | ||
}); | ||
|
||
var writesource = new Timedsource({ time: readSpeed * readsPerWrite, maxzoom: max }); | ||
var write = tilelive.createWriteStream(writesource, { highWaterMark: writeHighWater }); | ||
write.on('_write', function() { | ||
numWrites++; | ||
writeConcurrency = write._multiwriting; | ||
}); | ||
write.on('drain', function() { | ||
numDrains++; | ||
writeConcurrency = write._multiwriting; | ||
}); | ||
|
||
setInterval(report, 1); | ||
read.pipe(readProgress).pipe(write).on('stop', function() { | ||
console.log('finished'); | ||
process.exit(0); | ||
}); |