/**
* Copyright 2007-2011 Zuse Institute Berlin
*
* 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 de.zib.scalaris.examples;
import com.ericsson.otp.erlang.OtpErlangString;
import de.zib.scalaris.ConnectionException;
import de.zib.scalaris.NotFoundException;
import de.zib.scalaris.TimeoutException;
import de.zib.scalaris.TransactionSingleOp;
import de.zib.scalaris.UnknownException;
/**
* Provides an example for using the <tt>read</tt> methods of the
* {@link TransactionSingleOp} class.
*
* @author Nico Kruber, kruber@zib.de
* @version 2.0
* @since 2.0
*/
public class TransactionSingleOpReadExample {
/**
* Reads a key given on the command line with the <tt>read</tt> methods of
* {@link TransactionSingleOp}.<br />
* If no key is given, the default key <tt>"key"</tt> is used.
*
* @param args
* command line arguments (first argument can be an optional key
* to look up)
*/
public static void main(final String[] args) {
String key;
String value;
if (args.length != 1) {
key = "key";
} else {
key = args[0];
}
final OtpErlangString otpKey = new OtpErlangString(key);
OtpErlangString otpValue;
System.out.println("Reading values with the class `TransactionSingleOp`:");
try {
System.out.println(" creating object...");
final TransactionSingleOp sc = new TransactionSingleOp();
System.out
.println(" `OtpErlangObject readObject(OtpErlangString)`...");
otpValue = (OtpErlangString) sc.read(otpKey).value();
System.out.println(" read(" + otpKey.stringValue() + ") == "
+ otpValue.stringValue());
} catch (final ConnectionException e) {
System.out.println(" read(" + otpKey.stringValue()
+ ") failed: " + e.getMessage());
} catch (final TimeoutException e) {
System.out.println(" read(" + otpKey.stringValue()
+ ") failed with timeout: " + e.getMessage());
} catch (final NotFoundException e) {
System.out.println(" read(" + otpKey.stringValue()
+ ") failed with not found: " + e.getMessage());
} catch (final ClassCastException e) {
System.out.println(" read(" + otpKey.stringValue()
+ ") failed with unexpected return type: " + e.getMessage());
} catch (final UnknownException e) {
System.out.println(" read(" + otpKey.stringValue()
+ ") failed with unknown: " + e.getMessage());
}
try {
System.out.println(" creating object...");
final TransactionSingleOp sc = new TransactionSingleOp();
System.out.println(" `String read(String)`...");
value = sc.read(key).stringValue();
System.out.println(" read(" + key + ") == " + value);
} catch (final ConnectionException e) {
System.out.println(" read(" + key + ") failed: "
+ e.getMessage());
} catch (final TimeoutException e) {
System.out.println(" read(" + key + ") failed with timeout: "
+ e.getMessage());
} catch (final ClassCastException e) {
System.out.println(" read(" + key + ") failed with unexpected return type: "
+ e.getMessage());
} catch (final NotFoundException e) {
System.out.println(" read(" + key + ") failed with not found: "
+ e.getMessage());
} catch (final UnknownException e) {
System.out.println(" read(" + key + ") failed with unknown: "
+ e.getMessage());
}
}
}