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// Copyright (C) 2018 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import {fromNs, toNs} from '../../common/time';
import {LIMIT} from '../../common/track_data';
import {
TrackController,
trackControllerRegistry
} from '../../controller/track_controller';
import {
Config,
COUNTER_TRACK_KIND,
Data,
} from './common';
class CounterTrackController extends TrackController<Config, Data> {
static readonly kind = COUNTER_TRACK_KIND;
private setup = false;
private maximumValueSeen = 0;
private minimumValueSeen = 0;
async onBoundsChange(start: number, end: number, resolution: number):
Promise<Data> {
const startNs = toNs(start);
const endNs = toNs(end);
if (!this.setup) {
if (this.config.namespace === undefined) {
await this.query(`
create view ${this.tableName('counter_view')} as
select
id,
ts,
dur,
value
from experimental_counter_dur
where track_id = ${this.config.trackId};
`);
} else {
await this.query(`
create view ${this.tableName('counter_view')} as
select
id,
ts,
lead(ts, 1, ts) over (order by ts) - ts as dur,
value
from ${this.namespaceTable('counter')}
where track_id = ${this.config.trackId};
`);
}
const result = await this.query(`
select max(value), min(value)
from ${this.tableName('counter_view')}`);
this.maximumValueSeen = +result.columns[0].doubleValues![0];
this.minimumValueSeen = +result.columns[1].doubleValues![0];
await this.query(
`create virtual table ${this.tableName('window')} using window;`);
await this.query(`create virtual table ${this.tableName('span')} using
span_join(${this.tableName('counter_view')},
${this.tableName('window')});`);
this.setup = true;
}
const result = await this.engine.queryOneRow(`
select count(*)
from ${this.tableName('counter_view')}
where ts <= ${endNs} and ${startNs} <= ts + dur`);
// Only quantize if we have too much data to draw.
const isQuantized = result[0] > LIMIT;
// |resolution| is in s/px we want # ns for 1px window:
const bucketSizeNs = Math.round(resolution * 1e9);
let windowStartNs = startNs;
if (isQuantized) {
windowStartNs = Math.floor(windowStartNs / bucketSizeNs) * bucketSizeNs;
}
const windowDurNs = Math.max(1, endNs - windowStartNs);
this.query(`update ${this.tableName('window')} set
window_start=${windowStartNs},
window_dur=${windowDurNs},
quantum=${isQuantized ? bucketSizeNs : 0}`);
let query = `select min(ts) as ts,
max(value) as value,
-1 as id
from ${this.tableName('span')}
group by quantum_ts limit ${LIMIT};`;
if (!isQuantized) {
// Find the value just before the query range to ensure counters
// continue from the correct previous value.
// Union that with the query that finds all the counters within
// the current query range.
query = `
select *
from (
select ts, value, id
from ${this.tableName('counter_view')}
where ts <= ${startNs}
order by ts desc
limit 1
)
union
select *
from (
select ts, value, id
from ${this.tableName('counter_view')}
where ts <= ${endNs} and ${startNs} <= ts + dur
limit ${LIMIT}
);`;
}
const rawResult = await this.query(query);
const numRows = +rawResult.numRecords;
const data: Data = {
start,
end,
length: numRows,
isQuantized,
maximumValue: this.maximumValue(),
minimumValue: this.minimumValue(),
resolution,
timestamps: new Float64Array(numRows),
values: new Float64Array(numRows),
ids: new Float64Array(numRows),
};
const cols = rawResult.columns;
for (let row = 0; row < numRows; row++) {
const startSec = fromNs(+cols[0].longValues![row]);
const value = +cols[1].doubleValues![row];
const id = +cols[2].longValues![row];
data.timestamps[row] = startSec;
data.values[row] = value;
data.ids[row] = id;
}
return data;
}
private maximumValue() {
if (this.config.maximumValue === undefined) {
return this.maximumValueSeen;
} else {
return this.config.maximumValue;
}
}
private minimumValue() {
if (this.config.minimumValue === undefined) {
return this.minimumValueSeen;
} else {
return this.config.minimumValue;
}
}
}
trackControllerRegistry.register(CounterTrackController);
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