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package org.openslx.taskmanager.network;
import java.nio.charset.StandardCharsets;
import org.apache.log4j.Logger;
import org.openslx.taskmanager.api.TaskStatus;
import org.openslx.taskmanager.main.Taskmanager;
import com.google.gson.Gson;
public class RequestParser
{
private static final Logger log = Logger.getLogger( RequestParser.class );
/**
* Our very own gson instance (for serializing replies)
*/
private static final Gson sendGson = new Gson();
/**
* Handle the given unparsed request.
*
* @param source source of the request, where the reply will be send to (if any)
* @param payload Packet data received from network, already converted to a string
*/
public static byte[] handle( String payload )
{
String[] parts = payload.split( " *, *", 3 );
// Message format is "<message id>, <command>, <command payload/argument>"
if ( parts.length != 3 ) {
log.debug( "Could not split message" );
return null;
}
// Look at parts[1], if it's "status" it's a request for the task
// with the ID given in parts[2]
if ( parts[1].equals( "status" ) ) {
TaskStatus status = Taskmanager.getTaskStatus( parts[2] );
return serialize( parts[0], status );
}
// Now check if parts[1] is "release"
if ( parts[1].equals( "release" ) ) {
Taskmanager.releaseTask( parts[2] );
return null;
}
// Anything else in parts[0] will be treated as a fresh task invocation, so let's
// pass it on to the task manager.
TaskStatus status = Taskmanager.submitTask( parts[1], parts[2] );
return serialize( parts[0], status );
}
private static byte[] serialize( String messageId, TaskStatus status )
{
String data;
try {
synchronized ( sendGson ) {
data = sendGson.toJson( status );
}
} catch ( Throwable e ) {
log.warn( "Could not serialize reply with TaskStatus " + status.getStatusObjectClassName() );
log.warn( e.toString() );
return null;
}
return ( messageId + ',' + data ).getBytes( StandardCharsets.UTF_8 );
}
}
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