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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
*
* 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 io.fd.honeycomb.footprint;
import static java.lang.String.format;
import com.google.common.base.Charsets;
import com.google.common.io.CharStreams;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.management.ManagementFactory;
import java.util.Arrays;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class FootprintReaderImpl implements FootprintReader {
private static final Logger LOG = LoggerFactory.getLogger(FootprintReaderImpl.class);
private final int pid;
public FootprintReaderImpl() {
pid = initPID();
LOG.info("Footprint marker initialized for pid {}", pid);
}
private static int initPID() {
final String processName = ManagementFactory.getRuntimeMXBean().getName();
return Integer.parseInt(processName.substring(0, processName.indexOf("@")));
}
@Override
public int readCurrentFootprint() {
try {
final Process process = Runtime.getRuntime().exec(" ps -eo rss,pid");
final BufferedInputStream input = new BufferedInputStream(process.getInputStream());
final String processOut = CharStreams.toString(new InputStreamReader(input, Charsets.UTF_8));
final String pidLine = Arrays.stream(processOut.split(System.lineSeparator()))
.skip(1)// skip header
.map(String::trim)
.filter(line -> Integer.parseInt(line.split("\\s+")[1]) == pid)
.findFirst()
.orElseThrow(
() -> new IllegalStateException(format("Unable to find memory stats for pid %s", pid)));
return Integer.parseInt(pidLine.split(" ")[0]);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override
public int getPid() {
return pid;
}
}
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