/**
* Send a webservice request with a single command
*
* @param service The webserivce client instance
* @param cmd The command that we're sending (see the 'org.kie.remote.jaxb.gen package' in
* kie-remote-client)
* @param respClass The class that we expect as a response
* @param deploymentId The id of the deployment that we will interact with
* @return the response object
* @throws CommandWebServiceException if the webservice operation fails
*/
private static <T> T doWebserviceSingleCommandRequest(
CommandWebService service, Command<?> cmd, Class<T> respClass, String deploymentId)
throws CommandWebServiceException {
// Send request and get response from the WebService
JaxbCommandsRequest req = new JaxbCommandsRequest(deploymentId, cmd);
JaxbCommandsResponse response = service.execute(req);
// Unwrap response
JaxbCommandResponse<?> cmdResp = response.getResponses().get(0);
return (T) cmdResp;
}
/**
* Start a simple process, and retrieve the task information and content via the webservice
*
* @param applicationUrl Something like "http://localhost:8080/kie-wb/" or
* "http://localhost:8080/business-central/"
* @param user The user doing the webservice requests
* @param password The user's password
* @param deploymentId The deployment id that the request will interact with
* @param processId The id of the process we want to start
* @throws Exception if something goes wrong
*/
public static void startSimpleProcess(
URL applicationUrl, String user, String password, String deploymentId, String processId)
throws Exception {
CommandWebService commandWebService =
createWebserviceClient(applicationUrl, user, password, deploymentId);
// Create start process command
StartProcessCommand spc = new StartProcessCommand();
spc.setProcessId(processId);
JaxbStringObjectPairArray map = new JaxbStringObjectPairArray();
JaxbStringObjectPair keyValue = new JaxbStringObjectPair();
keyValue.setKey("myobject");
keyValue.setValue(new MyType("variable", 29));
map.getItems().add(keyValue);
spc.setParameter(map);
// Do webService request
JaxbProcessInstanceResponse jpir =
doWebserviceSingleCommandRequest(
commandWebService, spc, JaxbProcessInstanceResponse.class, deploymentId);
long procInstId = ((JaxbProcessInstanceResponse) jpir).getId();
// Create command
GetTasksByProcessInstanceIdCommand gtbic = new GetTasksByProcessInstanceIdCommand();
gtbic.setProcessInstanceId(procInstId);
// Do webservice request
JaxbLongListResponse jllr =
doWebserviceSingleCommandRequest(
commandWebService, gtbic, JaxbLongListResponse.class, deploymentId);
List<Long> taskIds = jllr.getResult();
long taskId = taskIds.get(0);
// Commands for task and task content
GetTaskCommand gtc = new GetTaskCommand();
gtc.setTaskId(taskId);
GetTaskContentCommand gtcc = new GetTaskContentCommand();
gtcc.setTaskId(taskId);
// Do webservice request (with both commands)
JaxbCommandsRequest req = new JaxbCommandsRequest(deploymentId, gtc);
req.getCommands().add(gtcc); // <3>
JaxbCommandsResponse response = commandWebService.execute(req);
// Get task and content response
Task task = (Task) response.getResponses().get(0).getResult();
Map<String, Object> contentMap =
(Map<String, Object>) response.getResponses().get(1).getResult();
}
/**
* Method to communicate with the backend via REST.
*
* @param command The {@link Command} object to be executed.
* @return The result of the {@link Command} object execution.
*/
private <T> T executeRestCommand(Command command) {
String cmdName = command.getClass().getSimpleName();
JaxbCommandsRequest jaxbRequest =
prepareCommandRequest(
command,
config.getUserName(),
config.getDeploymentId(),
config.getProcessInstanceId(),
config.getCorrelationProperties());
KieRemoteHttpRequest httpRequest = config.createHttpRequest().relativeRequest("/execute");
// necessary for deserialization
String deploymentId = config.getDeploymentId();
if (!emptyDeploymentId(deploymentId)) {
httpRequest.header(JaxbSerializationProvider.EXECUTE_DEPLOYMENT_ID_HEADER, deploymentId);
}
String jaxbRequestString = config.getJaxbSerializationProvider().serialize(jaxbRequest);
if (logger.isTraceEnabled()) {
try {
logger.trace(
"Sending {} via POST to {}", command.getClass().getSimpleName(), httpRequest.getUri());
} catch (Exception e) {
// do nothing because this should never happen..
}
logger.trace("Serialized JaxbCommandsRequest:\n {}", jaxbRequestString);
}
KieRemoteHttpResponse httpResponse = null;
try {
logger.debug(
"Sending POST request with "
+ command.getClass().getSimpleName()
+ " to "
+ httpRequest.getUri());
httpRequest.contentType(MediaType.APPLICATION_XML);
httpRequest.accept(MediaType.APPLICATION_XML);
httpRequest.body(jaxbRequestString);
httpRequest.post();
httpResponse = httpRequest.response();
} catch (Exception e) {
httpRequest.disconnect();
throw new RemoteCommunicationException("Unable to send HTTP POST request", e);
}
// Get response
boolean htmlException = false;
JaxbExceptionResponse exceptionResponse = null;
JaxbCommandsResponse cmdResponse = null;
int responseStatus;
try {
responseStatus = httpResponse.code();
String content = httpResponse.body();
if (responseStatus < 300) {
cmdResponse = deserializeResponseContent(content, JaxbCommandsResponse.class);
// check version
String version = cmdResponse.getVersion();
if (version == null) {
version = "pre-6.0.3";
}
if (!version.equals(VERSION)) {
logger.info(
"Response received from server version [{}] while client is version [{}]! This may cause problems.",
version,
VERSION);
}
} else {
String contentType = httpResponse.contentType();
if (contentType.equals(MediaType.APPLICATION_XML)) {
Object response = deserializeResponseContent(content, JaxbExceptionResponse.class);
if (response instanceof JaxbRestRequestException) {
JaxbRestRequestException exception = (JaxbRestRequestException) response;
exceptionResponse =
new JaxbExceptionResponse(
exception.getUrl(), exception.getCause(), exception.getStatus());
exceptionResponse.setCommandName(cmdName);
exceptionResponse.setIndex(0);
exceptionResponse.setMessage(exception.getMessage());
} else if (response instanceof JaxbExceptionResponse) {
exceptionResponse = (JaxbExceptionResponse) response;
}
} else if (contentType.startsWith(MediaType.TEXT_HTML)) {
htmlException = true;
exceptionResponse = new JaxbExceptionResponse();
Document doc = Jsoup.parse(content);
String body = doc.body().text();
exceptionResponse.setMessage(body);
exceptionResponse.setUrl(httpRequest.getUri().toString());
exceptionResponse.setStackTrace("");
} else {
throw new RemoteCommunicationException(
"Unable to deserialize response with content type '" + contentType + "'");
}
}
} catch (Exception e) {
logger.error(
"Unable to retrieve response content from request with status {}: {}", e.getMessage(), e);
throw new RemoteCommunicationException("Unable to retrieve content from response", e);
} finally {
httpRequest.disconnect();
}
if (cmdResponse != null) {
List<JaxbCommandResponse<?>> responses = cmdResponse.getResponses();
if (responses.size() == 0) {
return null;
} else if (responses.size() == 1) {
// The type information *should* come from the Command class -- but it's a jaxb-gen class,
// which means that it has lost it's type information..
// TODO: fix this?
JaxbCommandResponse<T> responseObject = (JaxbCommandResponse<T>) responses.get(0);
if (responseObject instanceof JaxbExceptionResponse) {
exceptionResponse = (JaxbExceptionResponse) responseObject;
} else {
return responseObject.getResult();
}
} else {
throw new RemoteCommunicationException(
"Unexpected number of results from "
+ command.getClass().getSimpleName()
+ ":"
+ responses.size()
+ " results instead of only 1");
}
}
logger.error("Response with status {} returned.", responseStatus);
// Process exception response
switch (responseStatus) {
case 409:
throw new RemoteTaskException(
exceptionResponse.getMessage(), exceptionResponse.getStackTrace());
default:
if (exceptionResponse != null) {
if (!htmlException) {
throw new RemoteApiException(
exceptionResponse.getMessage(), exceptionResponse.getStackTrace());
} else {
throw new RemoteCommunicationException(
exceptionResponse.getMessage(), exceptionResponse.getStackTrace());
}
} else {
throw new RemoteCommunicationException(
"Unable to communicate with remote API via URL "
+ "'"
+ httpRequest.getUri().toString()
+ "'");
}
}
}
