/**
* Returns ACLs for the application. An empty map is returned if no ACLs are found.
*
* @return a map of the Application ACLs.
* @throws IOException
*/
public Map<ApplicationAccessType, String> getApplicationAcls() throws IOException {
// TODO Seek directly to the key once a comparator is specified.
TFile.Reader.Scanner aclScanner = reader.createScanner();
LogKey key = new LogKey();
Map<ApplicationAccessType, String> acls = new HashMap<ApplicationAccessType, String>();
while (!aclScanner.atEnd()) {
TFile.Reader.Scanner.Entry entry = aclScanner.entry();
key.readFields(entry.getKeyStream());
if (key.toString().equals(APPLICATION_ACL_KEY.toString())) {
DataInputStream valueStream = entry.getValueStream();
while (true) {
String appAccessOp = null;
String aclString = null;
try {
appAccessOp = valueStream.readUTF();
} catch (EOFException e) {
// Valid end of stream.
break;
}
try {
aclString = valueStream.readUTF();
} catch (EOFException e) {
throw new YarnRuntimeException("Error reading ACLs", e);
}
acls.put(ApplicationAccessType.valueOf(appAccessOp), aclString);
}
}
aclScanner.advance();
}
return acls;
}
/**
* Returns the owner of the application.
*
* @return the application owner.
* @throws IOException
*/
public String getApplicationOwner() throws IOException {
TFile.Reader.Scanner ownerScanner = reader.createScanner();
LogKey key = new LogKey();
while (!ownerScanner.atEnd()) {
TFile.Reader.Scanner.Entry entry = ownerScanner.entry();
key.readFields(entry.getKeyStream());
if (key.toString().equals(APPLICATION_OWNER_KEY.toString())) {
DataInputStream valueStream = entry.getValueStream();
return valueStream.readUTF();
}
ownerScanner.advance();
}
return null;
}
/**
* Get a ContainerLogsReader to read the logs for the specified container.
*
* @param containerId
* @return object to read the container's logs or null if the logs could not be found
* @throws IOException
*/
@Private
public ContainerLogsReader getContainerLogsReader(ContainerId containerId) throws IOException {
ContainerLogsReader logReader = null;
final LogKey containerKey = new LogKey(containerId);
LogKey key = new LogKey();
DataInputStream valueStream = next(key);
while (valueStream != null && !key.equals(containerKey)) {
valueStream = next(key);
}
if (valueStream != null) {
logReader = new ContainerLogsReader(valueStream);
}
return logReader;
}
public void append(LogKey logKey, LogValue logValue) throws IOException {
DataOutputStream out = this.writer.prepareAppendKey(-1);
logKey.write(out);
out.close();
out = this.writer.prepareAppendValue(-1);
logValue.write(out);
out.close();
}
public void writeApplicationOwner(String user) throws IOException {
DataOutputStream out = this.writer.prepareAppendKey(-1);
APPLICATION_OWNER_KEY.write(out);
out.close();
out = this.writer.prepareAppendValue(-1);
out.writeUTF(user);
out.close();
}
private void writeVersion() throws IOException {
DataOutputStream out = this.writer.prepareAppendKey(-1);
VERSION_KEY.write(out);
out.close();
out = this.writer.prepareAppendValue(-1);
out.writeInt(VERSION);
out.close();
}
/**
* Read the next key and return the value-stream.
*
* @param key
* @return the valueStream if there are more keys or null otherwise.
* @throws IOException
*/
public DataInputStream next(LogKey key) throws IOException {
if (!this.atBeginning) {
this.scanner.advance();
} else {
this.atBeginning = false;
}
if (this.scanner.atEnd()) {
return null;
}
TFile.Reader.Scanner.Entry entry = this.scanner.entry();
key.readFields(entry.getKeyStream());
// Skip META keys
if (RESERVED_KEYS.containsKey(key.toString())) {
return next(key);
}
DataInputStream valueStream = entry.getValueStream();
return valueStream;
}
public void writeApplicationACLs(Map<ApplicationAccessType, String> appAcls)
throws IOException {
DataOutputStream out = this.writer.prepareAppendKey(-1);
APPLICATION_ACL_KEY.write(out);
out.close();
out = this.writer.prepareAppendValue(-1);
for (Entry<ApplicationAccessType, String> entry : appAcls.entrySet()) {
out.writeUTF(entry.getKey().toString());
out.writeUTF(entry.getValue());
}
out.close();
}
static {
RESERVED_KEYS = new HashMap<String, AggregatedLogFormat.LogKey>();
RESERVED_KEYS.put(APPLICATION_ACL_KEY.toString(), APPLICATION_ACL_KEY);
RESERVED_KEYS.put(APPLICATION_OWNER_KEY.toString(), APPLICATION_OWNER_KEY);
RESERVED_KEYS.put(VERSION_KEY.toString(), VERSION_KEY);
}
