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DatastoreClientImpl.java
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package utd.persistentDataStore.datastoreClient;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import utd.persistentDataStore.utils.StreamUtil;
public class DatastoreClientImpl implements DatastoreClient
{
private static Logger logger = Logger.getLogger(DatastoreClientImpl.class);
private InetAddress address;
private int port;
private InputStream instream;
private OutputStream outStream;
public DatastoreClientImpl(InetAddress address, int port)
{
this.address = address;
this.port = port;
}
/* (non-Javadoc)
* @see utd.persistentDataStore.datastoreClient.DatastoreClient#write(java.lang.String, byte[])
*/
private void getSocketConnection() throws IOException {
SocketAddress saddr = new InetSocketAddress(address, port);
Socket socket = new Socket(address, port);
try{
socket.connect(saddr); // Connects to server
}catch(Exception e)
{}
instream = socket.getInputStream();
outStream = socket.getOutputStream();
}
//write
@Override
public void write(String name, byte data[]) throws ClientException
{
logger.debug("Executing Write Operation");
try {
getSocketConnection();
StreamUtil.writeLine("write", outStream);
StreamUtil.writeLine(name, outStream);
StreamUtil.writeLine("" + data.length, outStream);
StreamUtil.writeData(data, outStream);
String reponseMsg = StreamUtil.readLine(instream);
System.out.println("response is "+reponseMsg);
if (!reponseMsg.equalsIgnoreCase("OK")) {
throw new ClientException("Failed in write");
}
} catch (Exception ex) {
throw new ClientException(ex.getMessage());
} finally {
StreamUtil.closeSocket(instream);
try {
outStream.close();
} catch (Exception ex) {
logger.debug(ex.getMessage());
}
}
}
/* (non-Javadoc)
* @see utd.persistentDataStore.datastoreClient.DatastoreClient#read(java.lang.String)
*/
//read
@Override
public byte[] read(String name) throws ClientException
{
logger.debug("Executing Read Operation");
byte[] data = null;
try {
getSocketConnection();
StreamUtil.writeLine("read", outStream);
StreamUtil.writeLine(name, outStream);
String reponseMsg = StreamUtil.readLine(instream);
System.out.println("response is "+reponseMsg);
if (reponseMsg.equalsIgnoreCase("ok")) {
int byteDataSize = Integer.parseInt(StreamUtil.readLine(instream));
data=StreamUtil.readData(byteDataSize, instream);
} else {
throw new ClientException("Failed reading");
}
} catch (Exception ex) {
throw new ClientException(ex.getMessage());
} finally {
StreamUtil.closeSocket(instream);
try {
outStream.close();
} catch (Exception ex) {
logger.debug(ex.getMessage());
}
}
return data;
}
/* (non-Javadoc)
* @see utd.persistentDataStore.datastoreClient.DatastoreClient#delete(java.lang.String)
*/
//delete
@Override
public void delete(String name) throws ClientException
{
logger.debug("Executing Delete Operation");
try {
getSocketConnection();
StreamUtil.writeLine("delete", outStream);
StreamUtil.writeLine(name, outStream);
String reponseMsg = StreamUtil.readLine(instream);
System.out.println("response is "+reponseMsg);
if (!reponseMsg.equalsIgnoreCase("ok")) {
throw new ClientException("Failed deleting");
}
} catch (Exception ex) {
throw new ClientException(ex.getMessage());
} finally {
StreamUtil.closeSocket(instream);
try {
outStream.close();
} catch (Exception ex) {
logger.debug(ex.getMessage());
}
}
}
/* (non-Javadoc)
* @see utd.persistentDataStore.datastoreClient.DatastoreClient#directory()
*/
//directory
@Override
public List<String> directory() throws ClientException
{
logger.debug("Executing Directory Operation");
List<String> filenames=new ArrayList<String>();
try {
getSocketConnection();
StreamUtil.writeLine("directory", outStream);
String reponseMsg = StreamUtil.readLine(instream);
if (reponseMsg.equalsIgnoreCase("ok")) {
int tonumberOfFiles = Integer.parseInt(StreamUtil.readLine(instream));
for (int i = 0; i < tonumberOfFiles; i++) {
String fileName=StreamUtil.readLine(instream);
filenames.add(fileName);
}
} else {
throw new ClientException("Failed reading");
}
} catch (IOException ex) {
throw new ClientException(ex.getMessage());
} finally {
StreamUtil.closeSocket(instream);
try {
outStream.close();
} catch (Exception ex) {
logger.debug(ex.getMessage());
}
}
return filenames;
}
}