@Test
public void testDummyProvider() throws Exception {
ClientResponse resp1 = ldclient.retrieveResource("http://localhost/resource1");
RepositoryConnection con1 = ModelCommons.asRepository(resp1.getData()).getConnection();
try {
con1.begin();
Assert.assertEquals(3, con1.size());
con1.commit();
} finally {
con1.close();
}
ClientResponse resp2 = ldclient.retrieveResource("http://localhost/resource2");
RepositoryConnection con2 = ModelCommons.asRepository(resp2.getData()).getConnection();
try {
con2.begin();
Assert.assertEquals(2, con2.size());
con2.commit();
} finally {
con2.close();
}
ClientResponse resp3 = ldclient.retrieveResource("http://localhost/resource3");
RepositoryConnection con3 = ModelCommons.asRepository(resp3.getData()).getConnection();
try {
con3.begin();
Assert.assertEquals(2, con3.size());
con3.commit();
} finally {
con3.close();
}
}
/**
* Retrieve the data for a resource using the given http client and endpoint definition. The
* service is supposed to manage the connection handling itself. See {@link AbstractHttpProvider}
* for a generic implementation of this method.
*
* @param resource the resource to be retrieved
* @param endpoint the endpoint definition
* @return a completely specified client response, including expiry information and the set of
* triples
*/
@Override
public ClientResponse retrieveResource(String resource, LDClientService client, Endpoint endpoint)
throws DataRetrievalException {
try {
String contentType;
if (endpoint != null && endpoint.getContentTypes().size() > 0) {
contentType =
CollectionUtils.fold(
endpoint.getContentTypes(),
new CollectionUtils.StringSerializer<ContentType>() {
@Override
public String serialize(ContentType contentType) {
return contentType.toString("q");
}
},
",");
} else {
contentType = CollectionUtils.fold(Arrays.asList(listMimeTypes()), ",");
}
long defaultExpires = client.getClientConfiguration().getDefaultExpiry();
if (endpoint != null && endpoint.getDefaultExpiry() != null) {
defaultExpires = endpoint.getDefaultExpiry();
}
final ResponseHandler handler = new ResponseHandler(resource, endpoint);
// a queue for queuing the request URLs needed to build the query response
Queue<String> requestUrls = new LinkedList<String>();
requestUrls.addAll(buildRequestUrl(resource, endpoint));
Set<String> visited = new HashSet<String>();
String requestUrl = requestUrls.poll();
while (requestUrl != null) {
if (!visited.contains(requestUrl)) {
HttpGet get = new HttpGet(requestUrl);
try {
get.setHeader("Accept", contentType);
get.setHeader("Accept-Language", "*"); // PoolParty compatibility
log.info(
"retrieving resource data for {} from '{}' endpoint, request URI is <{}>",
new Object[] {resource, getName(), get.getURI().toASCIIString()});
handler.requestUrl = requestUrl;
List<String> additionalRequestUrls = client.getClient().execute(get, handler);
requestUrls.addAll(additionalRequestUrls);
visited.add(requestUrl);
} finally {
get.releaseConnection();
}
}
requestUrl = requestUrls.poll();
}
Date expiresDate = handler.expiresDate;
if (expiresDate == null) {
expiresDate = new Date(System.currentTimeMillis() + defaultExpires * 1000);
}
long min_expires =
System.currentTimeMillis() + client.getClientConfiguration().getMinimumExpiry() * 1000;
if (expiresDate.getTime() < min_expires) {
log.info(
"expiry time returned by request lower than minimum expiration time; using minimum time instead");
expiresDate = new Date(min_expires);
}
if (log.isInfoEnabled()) {
RepositoryConnection con = handler.triples.getConnection();
log.info(
"retrieved {} triples for resource {}; expiry date: {}",
new Object[] {con.size(), resource, expiresDate});
con.close();
}
ClientResponse result = new ClientResponse(handler.httpStatus, handler.triples);
result.setExpires(expiresDate);
return result;
} catch (RepositoryException e) {
log.error("error while initialising Sesame repository; classpath problem?", e);
throw new DataRetrievalException(
"error while initialising Sesame repository; classpath problem?", e);
} catch (ClientProtocolException e) {
log.error(
"HTTP client error while trying to retrieve resource {}: {}", resource, e.getMessage());
throw new DataRetrievalException(
"I/O error while trying to retrieve resource " + resource, e);
} catch (IOException e) {
log.error("I/O error while trying to retrieve resource {}: {}", resource, e.getMessage());
throw new DataRetrievalException(
"I/O error while trying to retrieve resource " + resource, e);
} catch (RuntimeException ex) {
log.error(
"Unknown error while trying to retrieve resource {}: {}", resource, ex.getMessage());
throw new DataRetrievalException(
"Unknown error while trying to retrieve resource " + resource, ex);
}
}