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package org.apache.tuscany.sca.binding.comet.runtime.handler;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import org.apache.tuscany.sca.binding.comet.runtime.ServletFactory;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
import org.atmosphere.annotation.Broadcast;
import org.atmosphere.cpr.Broadcaster;
import org.atmosphere.cpr.DefaultBroadcaster;
import org.atmosphere.jersey.Broadcastable;
import org.atmosphere.jersey.SuspendResponse;
import com.google.gson.Gson;
import com.sun.jersey.spi.container.servlet.PerSession;
@Path("/")
@Produces("text/html;charset=ISO-8859-1")
@PerSession
public class CometBindingHandler {
private Broadcaster broadcaster;
private Map<String, RuntimeEndpoint> endpoints;
private Map<String, Operation> operations;
private Gson gson;
@Context
private ServletContext sc;
@GET
public SuspendResponse<String> connect() {
broadcaster = new DefaultBroadcaster();
endpoints = (Map<String, RuntimeEndpoint>)sc.getAttribute(ServletFactory.ENDPOINTS_KEY);
operations = (Map<String, Operation>)sc.getAttribute(ServletFactory.OPERATIONS_KEY);
gson = new Gson();
return new SuspendResponse.SuspendResponseBuilder<String>()
.broadcaster(broadcaster)
.outputComments(true)
//.addListener(new EventsLogger()) // use for logging or debugging when needed
.build();
}
@POST
@Path("/{service}/{method}")
@Broadcast
public Broadcastable callAndRespond(@PathParam("service") String service,
@PathParam("method") String method,
@FormParam("callback") String callbackMethod,
@FormParam("params") String jsonData) throws InvocationTargetException {
String url = "/" + service + "/" + method;
RuntimeEndpoint wire = endpoints.get(url);
Operation operation = operations.get(url);
Object[] args = new Object[operation.getInputType().getLogical().size()];
String[] json = parseArray(jsonData);
int index = 0;
for (DataType<?> dataType : operation.getInputType().getLogical()) {
args[index] = gson.fromJson(json[index], dataType.getPhysical());
index++;
}
Object response = wire.invoke(operation, args);
return new Broadcastable(callbackMethod + "($.secureEvalJSON('" + gson.toJson(response) + "'))", "", broadcaster);
}
private String[] parseArray(String jsonArray) {
List<String> objects = new ArrayList<String>();
int bracketNum = 0;
int parNum = 0;
int startPos = 1;
for (int i = 0; i < jsonArray.length(); i++) {
switch (jsonArray.charAt(i)) {
case '{':
bracketNum++;
break;
case '}':
bracketNum--;
break;
case '[':
parNum++;
break;
case ']':
parNum--;
break;
case ',':
if (bracketNum == 0 && parNum == 1) {
objects.add(jsonArray.substring(startPos, i));
startPos = i + 1;
}
}
}
objects.add(jsonArray.substring(startPos, jsonArray.length() - 1));
return objects.toArray(new String[] {});
}
}
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