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package org.openslx.bwlp.sat.util;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import org.apache.log4j.Logger;
import org.openslx.filetransfer.util.FileChunk;
public class Constants {
private static final Logger LOGGER = Logger.getLogger(Constants.class);
public static final String INCOMPLETE_UPLOAD_SUFFIX = ".part";
public static final int MAX_UPLOADS;
public static final int MAX_DOWNLOADS;
public static final int MAX_MASTER_UPLOADS = 2;
public static final int MAX_MASTER_DOWNLOADS = 3;
public static final int TRANSFER_TIMEOUT = 15 * 1000; // 15s
static {
long maxMem = Runtime.getRuntime().maxMemory();
if (maxMem == Long.MAX_VALUE) {
// Apparently the JVM was started without a memory limit (no -Xmx cmdline),
// so we try a dirty little trick by assuming this is linux and reading it
// from the /proc file system. If that fails too, assume a default of 512MB
try (BufferedReader br = new BufferedReader(new FileReader("/proc/meminfo"))) {
for (String line; (line = br.readLine()) != null;) {
if (line.startsWith("MemTotal:") && line.endsWith("kB")) {
String string = line.replaceAll("[^0-9]", "");
try {
maxMem = (Long.parseLong(string) / 2l) * 1024l;
LOGGER.debug("Guessing usable JVM memory via /proc/meminfo");
} catch (Exception e) {
}
break;
}
}
} catch (IOException e) {
}
if (maxMem == Long.MAX_VALUE) {
maxMem = 512l * 1024l * 1024l;
}
}
maxMem /= 1024l * 1024l;
// Now maxMem is the amount of memory in MiB
LOGGER.debug("Maximum JVM memory: " + maxMem + "MiB");
MAX_UPLOADS = (int) Math.max(1, (maxMem - 64) / (FileChunk.CHUNK_SIZE_MIB * 2));
MAX_DOWNLOADS = MAX_UPLOADS * 2;
}
}
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