io.mantisrx.sourcejob.synthetic.sink.QueryRequestPreProcessor Maven / Gradle / Ivy
/*
* Copyright 2019 Netflix, 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 io.mantisrx.sourcejob.synthetic.sink;
import static com.mantisrx.common.utils.MantisSourceJobConstants.CRITERION_PARAM_NAME;
import static com.mantisrx.common.utils.MantisSourceJobConstants.SUBSCRIPTION_ID_PARAM_NAME;
import io.mantisrx.runtime.Context;
import java.util.List;
import java.util.Map;
import lombok.extern.slf4j.Slf4j;
import rx.functions.Func2;
/**
* This is a callback that is invoked when a new client connects to this sink of this job.
* The callback is used to extract useful query parameters the user may have set on the GET request such as
* the clientId, subscriptionId and the criterion.
* The clientId identifies a group of connections belonging to the same consumer. Data is sent round-robin amongst
* all clients with the same clientId
* The subscriptionId tracks this particular client.
* The criterion is a valid MQL query. It indicates what data this client is interested in.
*/
@Slf4j
public class QueryRequestPreProcessor implements Func2>, Context, Void> {
public QueryRequestPreProcessor() { }
@Override
public Void call(Map> queryParams, Context context) {
log.info("QueryRequestPreProcessor:queryParams: {}", queryParams);
if (queryParams != null) {
if (queryParams.containsKey(SUBSCRIPTION_ID_PARAM_NAME) && queryParams.containsKey(CRITERION_PARAM_NAME)) {
final String subId = queryParams.get(SUBSCRIPTION_ID_PARAM_NAME).get(0);
final String query = queryParams.get(CRITERION_PARAM_NAME).get(0);
final String clientId = queryParams.get("clientId").get(0);
if (subId != null && query != null) {
try {
log.info("Registering query {}", query);
if (clientId != null && !clientId.isEmpty()) {
registerQuery(clientId + "_" + subId, query);
} else {
registerQuery(subId, query);
}
} catch (Throwable t) {
log.error("Error registering query", t);
}
}
}
}
return null;
}
private static synchronized void registerQuery(String subId, String query) {
QueryRefCountMap.INSTANCE.addQuery(subId, query);
}
}