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var assert = require('assert');
var LockingCache = require('../lib/lockingcache');
describe('locking cache', function() {
it('cache works', function(done) {
var cache = new LockingCache(function generate(key) {
process.nextTick(function() {
cache.put(key, null, '=' + key);
});
return [key];
}, 50);
cache.get(1, function(err, value) {
assert.ok(!err);
assert.equal(value, '=1');
done();
});
});
it('multiple requests get same response', function(done) {
var n = 0;
var cache = new LockingCache(function generate(key) {
process.nextTick(function() {
cache.put(key, null, '=' + n++);
});
return [key];
}, 50);
cache.get('key', function(err, value) {
assert.ok(!err);
assert.equal(value, '=0');
cache.get('key', function(err, value) {
assert.ok(!err);
assert.equal(value, '=0');
done();
});
});
});
it('errors get propagated', function(done) {
var cache = new LockingCache(function generate(key) {
process.nextTick(function() {
cache.put(key, new Error('hi2u'));
});
return [key];
}, 50);
cache.get('key', function(err, value) {
assert.ok(err);
assert.equal(err.toString(), 'Error: hi2u');
done();
});
});
it('multiple error-ed requests get the same response', function(done) {
var n = 0;
var cache = new LockingCache(function generate(key) {
process.nextTick(function() {
cache.put(key, new Error(n++));
});
return [key];
}, 50);
cache.get('key', function(err, value) {
assert.ok(err);
assert.equal(err, 'Error: 0');
cache.get('key', function(err, value) {
assert.ok(err);
assert.equal(err, 'Error: 0');
done();
});
});
});
it('derived keys get the same response', function(done) {
var n = 0;
var cache = new LockingCache(function generate(key) {
process.nextTick(function() {
cache.put(key, null, '=' + n);
cache.put(key + 'a', null, '=' + n);
n++;
});
return [key, key + 'a'];
}, 50);
var resultCount = 0;
cache.get('1', function(err, value) {
assert.ok(!err);
assert.equal(value, '=0');
cache.get('1a', function(err, value) {
assert.ok(!err);
assert.equal(value, '=0');
done();
});
});
});
it('.clear()', function(done) {
var cache = new LockingCache(function generate(key) {
setTimeout(function() {
cache.put(key, null, '=' + key);
}, 5);
return [key];
}, 50);
cache.get('1', function(err, value) {
assert.ok(!err);
assert.equal(value, '=1');
// cache.clear doesn't nuke outstanding callbacks, only timeouts
// which don't exist until we get a response, and then get deleted anyway
cache.clear();
done();
});
});
it('.del()', function(done) {
var cache = new LockingCache(function generate(key) {
setTimeout(function() {
cache.put(key, null, '=' + key);
}, 5);
return [key];
}, 50);
cache.get('1', function(err, value) {
assert.ok(false);
});
cache.del('1');
done();
});
it('later requests get a cached response', function(done) {
var n = 0;
var cache = new LockingCache(function generate(key) {
process.nextTick(function() {
cache.put(key, null, '=' + n++);
});
return [key];
}, 50);
cache.get('key', function(err, value) {
assert.ok(!err);
assert.equal(value, '=0');
cache.get('key', function(err, value) {
assert.ok(!err);
assert.equal(value, '=0');
});
setTimeout(function() {
cache.get('key', function(err, value) {
assert.ok(!err);
assert.equal(value, '=0');
done();
});
}, 10);
});
});
it('test cache with timeout=0', function(done) {
var n = 0;
var cache = new LockingCache(function generate(key) {
process.nextTick(function() {
cache.put(key, null, '=' + n++);
});
return [key];
}, 0);
cache.get('key', function(err, value) {
// (A) should get the first result
assert.ok(!err);
assert.equal(value, '=0');
cache.get('key', function(err, value) {
// (C) should get the second result. The first result should be
// timed-out already even though we're calling it in the same tick
// as our cached callbacks (ie. even before B below)
assert.ok(!err);
assert.equal(value, '=1');
done();
});
});
cache.get('key', function(err, value) {
// (B) should get the first result, because it's queued
assert.ok(!err);
assert.equal(value, '=0');
});
});
});
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