/*
* 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.
*/
package com.facebook.presto.atop;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.base.Throwables;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.time.ZonedDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.NoSuchElementException;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
public class TestingAtopFactory
implements AtopFactory
{
@Override
public Atop create(AtopTable table, ZonedDateTime date)
{
InputStream data = TestingAtopFactory.class.getResourceAsStream(table.name().toLowerCase() + ".txt");
requireNonNull(data, format("No data found for %s", table));
return new TestingAtop(data, date);
}
private static final class TestingAtop
implements Atop
{
private final BufferedReader reader;
private final ZonedDateTime date;
private String line;
private TestingAtop(InputStream dataStream, ZonedDateTime date)
{
this.date = date;
this.reader = new BufferedReader(new InputStreamReader(dataStream));
try {
line = reader.readLine();
}
catch (IOException e) {
line = null;
}
}
@Override
public boolean hasNext()
{
return line != null;
}
@Override
public String next()
{
if (line == null) {
throw new NoSuchElementException();
}
String currentLine = line;
try {
line = reader.readLine();
}
catch (IOException e) {
line = null;
}
if (currentLine.equals("SEP") || currentLine.equals("RESET")) {
return currentLine;
}
List<String> fields = new ArrayList<>(Splitter.on(" ").splitToList(currentLine));
// Timestamps in file are delta encoded
long secondsSinceEpoch = date.toEpochSecond();
secondsSinceEpoch += Integer.parseInt(fields.get(2));
fields.set(2, String.valueOf(secondsSinceEpoch));
return Joiner.on(" ").join(fields);
}
@Override
public void close()
{
try {
reader.close();
}
catch (IOException e) {
throw Throwables.propagate(e);
}
}
}
}