/*
* Copyright 2010 LinkedIn, Inc
*
* 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 voldemort.store.socket.clientrequest;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import voldemort.VoldemortException;
import voldemort.store.StoreTimeoutException;
import voldemort.store.UnreachableStoreException;
/**
* AbstractClientRequest implements ClientRequest to provide some basic
* mechanisms that most implementations will need.
*
* @param <T> Return type
*/
public abstract class AbstractClientRequest<T> implements ClientRequest<T> {
private T result;
private Exception error;
private volatile boolean isComplete = false;
private volatile boolean isParsed = false;
private volatile boolean isTimedOut = false;
protected abstract void formatRequestInternal(DataOutputStream outputStream) throws IOException;
protected abstract T parseResponseInternal(DataInputStream inputStream) throws IOException;
public boolean formatRequest(DataOutputStream outputStream) {
try {
formatRequestInternal(outputStream);
} catch(IOException e) {
error = e;
return false;
} catch(VoldemortException e) {
error = e;
return false;
}
return true;
}
public void parseResponse(DataInputStream inputStream) {
try {
result = parseResponseInternal(inputStream);
} catch(IOException e) {
error = e;
} catch(VoldemortException e) {
error = e;
} finally {
isParsed = true;
}
}
public T getResult() throws VoldemortException, IOException {
if(isTimedOut)
throw new StoreTimeoutException("Request timed out");
if(!isComplete)
throw new IllegalStateException("Client response not complete, cannot determine result");
if(!isParsed)
throw new UnreachableStoreException("Client response not read/parsed, cannot determine result");
if(error instanceof IOException)
throw (IOException) error;
else if(error instanceof VoldemortException)
throw (VoldemortException) error;
return result;
}
public final void complete() {
isComplete = true;
}
public boolean isComplete() {
return isComplete;
}
public final void timeOut() {
isTimedOut = true;
}
public boolean isTimedOut() {
return isTimedOut;
}
}