/*
* Copyright 2002-2014 the original author or authors.
*
* 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 opensnap.repository;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import opensnap.domain.Identifiable;
import org.bson.types.ObjectId;
import org.mongodb.Document;
import org.mongodb.async.MongoCollection;
import org.mongodb.async.MongoDatabase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
public abstract class MongoRepository<T extends Identifiable> {
private final MongoCollection<Document> collection;
private static final Logger logger = LoggerFactory.getLogger(MongoRepository.class);
private final ObjectMapper mapper;
private final Class<T> clazz;
public MongoRepository(MongoDatabase db, ObjectMapper mapper, String collectionName, Class<T> clazz) {
this.mapper = mapper;
this.clazz = clazz;
collection = db.getCollection(collectionName);
}
public CompletableFuture<T> insert(T elem) {
CompletableFuture<T> future = new CompletableFuture<>();
try {
Document doc = Document.valueOf(mapper.writeValueAsString(elem));
collection.insert(doc).register((result, e) -> {
if (result != null && result.wasAcknowledged()) {
elem.setId(doc.getObjectId("_id"));
future.complete(elem);
} else {
logger.error("Error while creating a new document in insert() : " + doc.toString(), e);
future.cancel(true);
}
});
} catch (JsonProcessingException e) {
logger.error("Error while creating element " + elem.toString() + " in insert()", e);
future.cancel(true);
}
return future;
}
public CompletableFuture<T> getOne(String key, Object value) {
CompletableFuture<T> future = new CompletableFuture<>();
collection.find(new Document(key, value)).one().register((document, e) -> {
try {
if (document != null) {
future.complete(mapper.readValue(document.toString(), clazz));
} else {
logger.error("No document with attribute " + key + "=" + value + " found", e);
future.cancel(true);
}
} catch (IOException ex) {
logger.error("Error while parsing document in getOne() : " + document.toString(), ex);
future.cancel(true);
}
});
return future;
}
public CompletableFuture<T> getById(String id) {
return this.getOne("_id", new ObjectId(id));
}
public CompletableFuture<List<T>> getSome(String key, Object value) {
CompletableFuture<List<T>> future = new CompletableFuture<>();
List<T> list = new ArrayList<>();
collection.find(new Document(key, value)).forEach((document) -> {
try {
list.add(mapper.readValue(document.toString(), clazz));
} catch (IOException e) {
logger.error("Error while parsing document in getSome() : " + document.toString(), e);
}
}).register((result, e) -> future.complete(list));;
return future;
}
public CompletableFuture<List<T>> getAll() {
CompletableFuture<List<T>> future = new CompletableFuture<>();
List<T> list = new ArrayList<>();
collection.find(Document.valueOf("{_id:{ $exists: true }}")).forEach((document) -> {
try {
list.add(mapper.readValue(document.toString(), clazz));
} catch (IOException e) {
logger.error("Error while parsing document in getAll() : " + document.toString(), e);
}
}).register((result, e) -> future.complete(list));
return future;
}
public void remove(String id) {
throw new UnsupportedOperationException("Remove operation not yet implemented in MongoDB async driver");
}
public CompletableFuture<Long> count(String key, Object value) {
CompletableFuture<Long> future = new CompletableFuture<>();
collection.find(new Document(key, value)).count().register((count, e) -> future.complete(count));
return future;
}
}