/**
* Client side method to poll for the oldest run which must be older than localAge. If found, the
* run will be downloaded into the temp space. and the run name will be returned.
*
* @param localAge The age of the oldest local run in the queue
* @return The file reference to the local run in the directory
*/
public static File pollRun(long localAge) {
Config.HostInfo selectedHost = null;
NameValuePair<Long> selectedRun = null;
for (int i = 0; i < Config.pollHosts.length; i++) {
Config.HostInfo pollHost = Config.pollHosts[i];
NameValuePair<Long> run = null;
try {
run = poll(pollHost, localAge);
} catch (IOException e) {
logger.log(Level.WARNING, "Error polling " + pollHost.url + '.', e);
}
if (run != null && (selectedRun == null || run.value > selectedRun.value)) {
selectedRun = run;
selectedHost = pollHost;
}
}
File tmpDir = null;
if (selectedRun != null) {
try {
// Download and unjar the run.
File tmpJar = download(selectedHost, selectedRun);
if (tmpJar == null) {
logger.warning("Download null jar file.");
return null;
}
tmpDir = FileHelper.unjarTmp(tmpJar);
File metaInf = new File(tmpDir, "META-INF");
if (!metaInf.isDirectory()) metaInf.mkdir();
// Create origin file to know where this run came from.
FileHelper.writeStringToFile(
selectedHost.name + '.' + selectedRun.name, new File(metaInf, "origin"));
tmpJar.delete();
} catch (IOException e) {
logger.log(
Level.WARNING,
"Error downloading run " + selectedRun.name + " from " + selectedHost.url + '.',
e);
}
}
return tmpDir;
}
/**
* Jars up the run directory.
*
* @param run The run to jar up
* @return The resulting jar file
* @throws IOException Error creating the jar
*/
public static File jar(Run run) throws IOException {
logger.info("Preparing run " + run.getRunId() + " for download.");
String runId = run.getRunId();
String jarName = runId + ".jar";
File jar = new File(Config.TMP_DIR, jarName);
String[] files = new File(Config.OUT_DIR, runId).list();
if (jar.exists()) jar.delete();
FileHelper.jar(Config.OUT_DIR + runId, files, jar.getAbsolutePath());
return jar;
}