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This module contains the SQL Client for exploring and
submitting SQL programs to Flink.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.flink.table.client.cli;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.table.client.gateway.ResultDescriptor;
import org.apache.flink.table.client.gateway.SqlExecutionException;
import org.jline.utils.AttributedString;
import org.jline.utils.AttributedStringBuilder;
import org.jline.utils.AttributedStyle;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.IntStream;
import static org.apache.flink.table.client.cli.CliUtils.normalizeColumn;
/**
* Abstract CLI view for showing results (either as changelog or table).
*/
public abstract class CliResultView> extends CliView {
protected static final int MAX_COLUMN_WIDTH = 25;
protected static final int NO_ROW_SELECTED = -1;
protected static final List> REFRESH_INTERVALS;
static {
REFRESH_INTERVALS = new ArrayList<>();
REFRESH_INTERVALS.add(Tuple2.of("Fastest", 0L));
REFRESH_INTERVALS.add(Tuple2.of("100 ms", 100L));
REFRESH_INTERVALS.add(Tuple2.of("500 ms", 100L));
REFRESH_INTERVALS.add(Tuple2.of("1 s", 1_000L));
REFRESH_INTERVALS.add(Tuple2.of("5 s", 5_000L));
REFRESH_INTERVALS.add(Tuple2.of("10 s", 10_000L));
REFRESH_INTERVALS.add(Tuple2.of("1 min", 60_000L));
REFRESH_INTERVALS.add(Tuple2.of("-", -1L));
}
private final RefreshThread refreshThread;
protected final ResultDescriptor resultDescriptor;
protected int refreshInterval;
protected List previousResults;
protected List results;
protected int selectedRow;
public CliResultView(CliClient client, ResultDescriptor resultDescriptor) {
super(client);
this.resultDescriptor = resultDescriptor;
refreshThread = new RefreshThread();
selectedRow = NO_ROW_SELECTED;
}
// --------------------------------------------------------------------------------------------
protected void increaseRefreshInterval() {
refreshInterval = Math.min(REFRESH_INTERVALS.size() - 1, refreshInterval + 1);
// reset view
resetAllParts();
synchronized (refreshThread) {
refreshThread.notify();
}
}
protected void decreaseRefreshInterval(int minInterval) {
refreshInterval = Math.max(minInterval, refreshInterval - 1);
// reset view
resetAllParts();
synchronized (refreshThread) {
refreshThread.notify();
}
}
protected void selectRowUp() {
final int visibleRowTop = offsetY;
if (selectedRow == NO_ROW_SELECTED) {
if (!getMainLines().isEmpty()) {
// most bottom visible row
selectedRow = Math.min(getMainLines().size(), offsetY + getVisibleMainHeight()) - 1;
}
}
// in visible area
else if (selectedRow > visibleRowTop) {
selectedRow = selectedRow - 1;
}
// not visible, scrolling needed
else {
selectedRow = Math.max(0, selectedRow - 1);
scrollUp();
}
// reset view
resetMainPart();
}
protected void selectRowDown() {
final int visibleRowBottom = Math.min(getMainLines().size(), offsetY + getVisibleMainHeight()) - 1;
if (selectedRow == NO_ROW_SELECTED) {
selectedRow = offsetY;
}
// in visible area
else if (visibleRowBottom >= 0 && selectedRow < visibleRowBottom) {
selectedRow = selectedRow + 1;
}
// not visible, scrolling needed
else {
selectedRow = Math.min(Math.max(0, getMainLines().size() - 1), selectedRow + 1);
scrollDown();
}
// reset view
resetMainPart();
}
protected void openRow() {
if (selectedRow == NO_ROW_SELECTED) {
return;
}
final CliRowView view = new CliRowView(
client,
resultDescriptor.getResultSchema().getColumnNames(),
CliUtils.typesToString(resultDescriptor.getResultSchema().getTypes()),
getRow(results.get(selectedRow)));
view.open(); // enter view
}
protected void stopRetrieval() {
// stop retrieval
refreshThread.isRunning = false;
synchronized (refreshThread) {
refreshThread.notify();
}
}
protected boolean isRetrieving() {
return refreshThread.isRunning;
}
// --------------------------------------------------------------------------------------------
protected abstract void refresh();
protected abstract int computeColumnWidth(int idx);
protected abstract String[] getRow(String[] resultRow);
// --------------------------------------------------------------------------------------------
@Override
protected void init() {
refreshThread.start();
}
@Override
protected List computeMainLines() {
final List lines = new ArrayList<>();
IntStream.range(0, results.size()).forEach(lineIdx -> {
final String[] line = results.get(lineIdx);
final AttributedStringBuilder row = new AttributedStringBuilder();
// highlight selected row
if (lineIdx == selectedRow) {
row.style(AttributedStyle.DEFAULT.inverse());
}
IntStream.range(0, line.length).forEach(colIdx -> {
final String col = line[colIdx];
final int columnWidth = computeColumnWidth(colIdx);
row.append(' ');
// check if value was present before last update, if not, highlight it
// we don't highlight if the retrieval stopped
// both inverse and bold together do not work correctly
if (previousResults != null && lineIdx != selectedRow && refreshThread.isRunning &&
(lineIdx >= previousResults.size() || !col.equals(previousResults.get(lineIdx)[colIdx]))) {
row.style(AttributedStyle.BOLD);
normalizeColumn(row, col, columnWidth);
row.style(AttributedStyle.DEFAULT);
} else {
normalizeColumn(row, col, columnWidth);
}
});
lines.add(row.toAttributedString());
});
return lines;
}
@Override
protected void cleanUp() {
stopRetrieval();
}
// --------------------------------------------------------------------------------------------
private class RefreshThread extends Thread {
public volatile boolean isRunning = true;
public long lastUpdatedResults = System.currentTimeMillis();
@Override
public void run() {
while (isRunning) {
final long interval = REFRESH_INTERVALS.get(refreshInterval).f1;
if (interval >= 0) {
// refresh according to specified interval
if (interval > 0) {
synchronized (RefreshThread.this) {
if (isRunning) {
try {
RefreshThread.this.wait(interval);
} catch (InterruptedException e) {
continue;
}
}
}
}
synchronized (CliResultView.this) {
refresh();
// do the display only every 100 ms (even in fastest mode)
if (System.currentTimeMillis() - lastUpdatedResults > 100) {
if (CliResultView.this.isRunning()) {
display();
}
lastUpdatedResults = System.currentTimeMillis();
}
}
} else {
// keep the thread running but without refreshing
synchronized (RefreshThread.this) {
if (isRunning) {
try {
RefreshThread.this.wait(100);
} catch (InterruptedException e) {
// continue
}
}
}
}
}
// final display
synchronized (CliResultView.this) {
if (CliResultView.this.isRunning()) {
display();
}
}
// cancel table program
try {
// the cancellation happens in the refresh thread in order to keep the main thread
// responsive at all times; esp. if the cluster is not available
client.getExecutor().cancelQuery(client.getContext(), resultDescriptor.getResultId());
} catch (SqlExecutionException e) {
// ignore further exceptions
}
}
}
}