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// Copyright (C) 2019 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, Data, SLICE_TRACK_KIND} from './common';
class AsyncSliceTrackController extends TrackController<Config, Data> {
static readonly kind = SLICE_TRACK_KIND;
private setup = false;
async onBoundsChange(start: number, end: number, resolution: number):
Promise<Data> {
const startNs = toNs(start);
const endNs = toNs(end);
// Ns in 1px width. We want all slices smaller than 1px to be grouped.
const minNs = toNs(resolution);
if (!this.setup) {
await this.query(
`create virtual table ${this.tableName('window')} using window;`);
await this.query(
`create view ${this.tableName('small')} as ` +
`select ts,dur,depth,name,slice_id from slice ` +
`where track_id = ${this.config.trackId} ` +
`and dur < ${minNs} ` +
`order by ts;`);
await this.query(`create virtual table ${this.tableName('span')} using
span_join(${this.tableName('small')} PARTITIONED depth,
${this.tableName('window')});`);
this.setup = true;
}
const windowDurNs = Math.max(1, endNs - startNs);
this.query(`update ${this.tableName('window')} set
window_start=${startNs},
window_dur=${windowDurNs},
quantum=${minNs}`);
await this.query(`drop view if exists ${this.tableName('small')}`);
await this.query(`drop view if exists ${this.tableName('big')}`);
await this.query(`drop view if exists ${this.tableName('summary')}`);
await this.query(
`create view ${this.tableName('small')} as ` +
`select ts,dur,depth,name, slice_id from slice ` +
`where track_id = ${this.config.trackId} ` +
`and dur < ${minNs} ` +
`order by ts `);
await this.query(
`create view ${this.tableName('big')} as ` +
`select ts,dur,depth,name, slice_id from slice ` +
`where track_id = ${this.config.trackId} ` +
`and ts >= ${startNs} - dur ` +
`and ts <= ${endNs} ` +
`and dur >= ${minNs} ` +
`order by ts `);
// So that busy slices never overlap, we use the start of the bucket
// as the ts, even though min(ts) would technically be more accurate.
await this.query(`create view ${this.tableName('summary')} as select
(quantum_ts * ${minNs} + ${startNs}) as ts,
${minNs} as dur,
depth,
'Busy' as name,
-1 as slice_id
from ${this.tableName('span')}
group by depth, quantum_ts
order by ts;`);
const query = `select * from ${this.tableName('summary')} UNION ` +
`select * from ${this.tableName('big')} order by ts limit ${LIMIT}`;
const rawResult = await this.query(query);
if (rawResult.error) {
throw new Error(`Query error "${query}": ${rawResult.error}`);
}
const numRows = +rawResult.numRecords;
const slices: Data = {
start,
end,
resolution,
length: numRows,
strings: [],
sliceIds: new Float64Array(numRows),
starts: new Float64Array(numRows),
ends: new Float64Array(numRows),
depths: new Uint16Array(numRows),
titles: new Uint16Array(numRows),
};
const stringIndexes = new Map<string, number>();
function internString(str: string) {
let idx = stringIndexes.get(str);
if (idx !== undefined) return idx;
idx = slices.strings.length;
slices.strings.push(str);
stringIndexes.set(str, idx);
return idx;
}
for (let row = 0; row < numRows; row++) {
const cols = rawResult.columns;
const startSec = fromNs(+cols[0].longValues![row]);
slices.starts[row] = startSec;
slices.ends[row] = startSec + fromNs(+cols[1].longValues![row]);
slices.depths[row] = +cols[2].longValues![row];
slices.titles[row] = internString(cols[3].stringValues![row]);
slices.sliceIds[row] = +cols[4].longValues![row];
}
return slices;
}
}
trackControllerRegistry.register(AsyncSliceTrackController);
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