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Camel MongoDB (Java Driver 3) component
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.camel.component.mongodb;
import java.util.ArrayList;
import java.util.List;
import com.mongodb.AggregationOutput;
import com.mongodb.BasicDBList;
import com.mongodb.BasicDBObject;
import com.mongodb.CommandResult;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.WriteConcern;
import com.mongodb.WriteResult;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.TypeConverter;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.util.MessageHelper;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The MongoDb producer.
*/
public class MongoDbProducer extends DefaultProducer {
private static final Logger LOG = LoggerFactory.getLogger(MongoDbProducer.class);
private MongoDbEndpoint endpoint;
public MongoDbProducer(MongoDbEndpoint endpoint) {
super(endpoint);
this.endpoint = endpoint;
}
public void process(Exchange exchange) throws Exception {
MongoDbOperation operation = endpoint.getOperation();
Object header = exchange.getIn().getHeader(MongoDbConstants.OPERATION_HEADER);
if (header != null) {
LOG.debug("Overriding default operation with operation specified on header: {}", header);
try {
if (header instanceof MongoDbOperation) {
operation = ObjectHelper.cast(MongoDbOperation.class, header);
} else {
// evaluate as a String
operation = MongoDbOperation.valueOf(exchange.getIn().getHeader(MongoDbConstants.OPERATION_HEADER, String.class));
}
} catch (Exception e) {
throw new CamelMongoDbException("Operation specified on header is not supported. Value: " + header, e);
}
}
try {
invokeOperation(operation, exchange);
} catch (Exception e) {
throw MongoDbComponent.wrapInCamelMongoDbException(e);
}
}
/**
* Entry method that selects the appropriate MongoDB operation and executes it
*
* @param operation
* @param exchange
* @throws Exception
*/
protected void invokeOperation(MongoDbOperation operation, Exchange exchange) throws Exception {
switch (operation) {
case count:
doCount(exchange);
break;
case findOneByQuery:
doFindOneByQuery(exchange);
break;
case findById:
doFindById(exchange);
break;
case findAll:
doFindAll(exchange);
break;
case insert:
doInsert(exchange);
break;
case save:
doSave(exchange);
break;
case update:
doUpdate(exchange);
break;
case remove:
doRemove(exchange);
break;
case aggregate:
doAggregate(exchange);
break;
case getDbStats:
doGetStats(exchange, MongoDbOperation.getDbStats);
break;
case getColStats:
doGetStats(exchange, MongoDbOperation.getColStats);
break;
default:
throw new CamelMongoDbException("Operation not supported. Value: " + operation);
}
}
// ----------- MongoDB operations ----------------
protected void doGetStats(Exchange exchange, MongoDbOperation operation) throws Exception {
DBObject result = null;
if (operation == MongoDbOperation.getColStats) {
result = calculateCollection(exchange).getStats();
} else if (operation == MongoDbOperation.getDbStats) {
// if it's a DB, also take into account the dynamicity option and the DB that is used
result = calculateCollection(exchange).getDB().getStats();
} else {
throw new CamelMongoDbException("Internal error: wrong operation for getStats variant" + operation);
}
Message responseMessage = prepareResponseMessage(exchange, operation);
responseMessage.setBody(result);
}
protected void doRemove(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
DBObject removeObj = exchange.getIn().getMandatoryBody(DBObject.class);
WriteConcern wc = extractWriteConcern(exchange);
WriteResult result = wc == null ? dbCol.remove(removeObj) : dbCol.remove(removeObj, wc);
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.remove);
// we always return the WriteResult, because whether the getLastError was called or not,
// the user will have the means to call it or obtain the cached CommandResult
processAndTransferWriteResult(result, exchange);
resultMessage.setHeader(MongoDbConstants.RECORDS_AFFECTED, result.getN());
}
@SuppressWarnings("unchecked")
protected void doUpdate(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
List saveObj = exchange.getIn().getMandatoryBody((Class>)(Class)List.class);
if (saveObj.size() != 2) {
throw new CamelMongoDbException("MongoDB operation = insert, failed because body is not a List of DBObject objects with size = 2");
}
DBObject updateCriteria = saveObj.get(0);
DBObject objNew = saveObj.get(1);
Boolean multi = exchange.getIn().getHeader(MongoDbConstants.MULTIUPDATE, Boolean.class);
Boolean upsert = exchange.getIn().getHeader(MongoDbConstants.UPSERT, Boolean.class);
WriteResult result;
WriteConcern wc = extractWriteConcern(exchange);
// In API 2.7, the default upsert and multi values of update(DBObject, DBObject) are false, false, so we unconditionally invoke the
// full-signature method update(DBObject, DBObject, boolean, boolean). However, the default behaviour may change in the future,
// so it's safer to be explicit at this level for full determinism
if (multi == null && upsert == null) {
// for update with no multi nor upsert but with specific WriteConcern there is no update signature without multi and upsert args,
// so assume defaults
result = wc == null ? dbCol.update(updateCriteria, objNew) : dbCol.update(updateCriteria, objNew, false, false, wc);
} else {
// we calculate the final boolean values so that if any of these
// parameters is null, it is resolved to false
result = wc == null ? dbCol.update(updateCriteria, objNew, calculateBooleanValue(upsert), calculateBooleanValue(multi)) : dbCol
.update(updateCriteria, objNew, calculateBooleanValue(upsert), calculateBooleanValue(multi), wc);
}
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.update);
// we always return the WriteResult, because whether the getLastError was called or not, the user will have the means to call it or
// obtain the cached CommandResult
processAndTransferWriteResult(result, exchange);
resultMessage.setHeader(MongoDbConstants.RECORDS_AFFECTED, result.getN());
}
protected void doSave(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
DBObject saveObj = exchange.getIn().getMandatoryBody(DBObject.class);
WriteConcern wc = extractWriteConcern(exchange);
WriteResult result = wc == null ? dbCol.save(saveObj) : dbCol.save(saveObj, wc);
prepareResponseMessage(exchange, MongoDbOperation.save);
// we always return the WriteResult, because whether the getLastError was called or not, the user will have the means to call it or
// obtain the cached CommandResult
processAndTransferWriteResult(result, exchange);
}
protected void doFindById(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
Object o = exchange.getIn().getMandatoryBody();
DBObject ret;
DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
if (fieldFilter == null) {
ret = dbCol.findOne(o);
} else {
ret = dbCol.findOne(o, fieldFilter);
}
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.save);
resultMessage.setBody(ret);
resultMessage.setHeader(MongoDbConstants.RESULT_TOTAL_SIZE, ret == null ? 0 : 1);
}
@SuppressWarnings({"rawtypes", "unchecked"})
protected void doInsert(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
boolean singleInsert = true;
Object insert = exchange.getIn().getBody(DBObject.class);
// body could not be converted to DBObject, check to see if it's of type List
if (insert == null) {
insert = exchange.getIn().getBody(List.class);
// if the body of type List was obtained, ensure that all items are of type DBObject and cast the List to List
if (insert != null) {
singleInsert = false;
insert = attemptConvertToList((List)insert, exchange);
} else {
throw new CamelMongoDbException("MongoDB operation = insert, Body is not conversible to type DBObject nor List");
}
}
WriteResult result;
WriteConcern wc = extractWriteConcern(exchange);
if (singleInsert) {
result = wc == null ? dbCol.insert((DBObject)insert) : dbCol.insert((DBObject)insert, wc);
} else {
result = wc == null ? dbCol.insert((List)insert) : dbCol.insert((List)insert, wc);
}
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.insert);
// we always return the WriteResult, because whether the getLastError was called or not, the user will have the means to call it or
// obtain the cached CommandResult
processAndTransferWriteResult(result, exchange);
resultMessage.setBody(result);
}
protected void doFindAll(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
// do not use getMandatoryBody, because if the body is empty we want to retrieve all objects in the collection
DBObject query = null;
// do not run around looking for a type converter unless there is a need for it
if (exchange.getIn().getBody() != null) {
query = exchange.getIn().getBody(DBObject.class);
}
DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
// get the batch size and number to skip
Integer batchSize = exchange.getIn().getHeader(MongoDbConstants.BATCH_SIZE, Integer.class);
Integer numToSkip = exchange.getIn().getHeader(MongoDbConstants.NUM_TO_SKIP, Integer.class);
Integer limit = exchange.getIn().getHeader(MongoDbConstants.LIMIT, Integer.class);
DBObject sortBy = exchange.getIn().getHeader(MongoDbConstants.SORT_BY, DBObject.class);
DBCursor ret = null;
try {
if (query == null && fieldFilter == null) {
ret = dbCol.find(new BasicDBObject());
} else if (fieldFilter == null) {
ret = dbCol.find(query);
} else {
ret = dbCol.find(query, fieldFilter);
}
if (sortBy != null) {
ret.sort(sortBy);
}
if (batchSize != null) {
ret.batchSize(batchSize.intValue());
}
if (numToSkip != null) {
ret.skip(numToSkip.intValue());
}
if (limit != null) {
ret.limit(limit.intValue());
}
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.findAll);
resultMessage.setBody(ret.toArray());
resultMessage.setHeader(MongoDbConstants.RESULT_TOTAL_SIZE, ret.count());
resultMessage.setHeader(MongoDbConstants.RESULT_PAGE_SIZE, ret.size());
} catch (Exception e) {
// rethrow the exception
throw e;
} finally {
// make sure the cursor is closed
if (ret != null) {
ret.close();
}
}
}
protected void doFindOneByQuery(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
DBObject o = exchange.getIn().getMandatoryBody(DBObject.class);
DBObject ret;
DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
if (fieldFilter == null) {
ret = dbCol.findOne(o);
} else {
ret = dbCol.findOne(o, fieldFilter);
}
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.findOneByQuery);
resultMessage.setBody(ret);
resultMessage.setHeader(MongoDbConstants.RESULT_TOTAL_SIZE, ret == null ? 0 : 1);
}
protected void doCount(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
Long answer = Long.valueOf(dbCol.count());
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.count);
resultMessage.setBody(answer);
}
/**
* All headers except collection and database are non available for this
* operation.
*
* @param exchange
* @throws Exception
*/
protected void doAggregate(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
DBObject query = exchange.getIn().getMandatoryBody(DBObject.class);
// Impossible with java driver to get the batch size and number to skip
Iterable dbIterator = null;
try {
AggregationOutput aggregationResult = null;
// Allow body to be a pipeline
// @see http://docs.mongodb.org/manual/core/aggregation/
if (query instanceof BasicDBList) {
BasicDBList queryList = (BasicDBList)query;
aggregationResult = dbCol.aggregate((DBObject)queryList.get(0), queryList
.subList(1, queryList.size()).toArray(new BasicDBObject[queryList.size() - 1]));
} else {
aggregationResult = dbCol.aggregate(query);
}
dbIterator = aggregationResult.results();
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.aggregate);
resultMessage.setBody(dbIterator);
// Mongo Driver does not allow to read size and to paginate aggregate result
} catch (Exception e) {
// rethrow the exception
throw e;
}
}
// --------- Convenience methods -----------------------
private DBCollection calculateCollection(Exchange exchange) throws Exception {
// dynamic calculation is an option. In most cases it won't be used and we should not penalise all users with running this
// resolution logic on every Exchange if they won't be using this functionality at all
if (!endpoint.isDynamicity()) {
return endpoint.getDbCollection();
}
String dynamicDB = exchange.getIn().getHeader(MongoDbConstants.DATABASE, String.class);
String dynamicCollection = exchange.getIn().getHeader(MongoDbConstants.COLLECTION, String.class);
@SuppressWarnings("unchecked")
List dynamicIndex = exchange.getIn().getHeader(MongoDbConstants.COLLECTION_INDEX, List.class);
DBCollection dbCol = null;
if (dynamicDB == null && dynamicCollection == null) {
dbCol = endpoint.getDbCollection();
} else {
DB db = null;
if (dynamicDB == null) {
db = endpoint.getDb();
} else {
db = endpoint.getMongoConnection().getDB(dynamicDB);
}
if (dynamicCollection == null) {
dbCol = db.getCollection(endpoint.getCollection());
} else {
dbCol = db.getCollection(dynamicCollection);
// on the fly add index
if (dynamicIndex == null) {
endpoint.ensureIndex(dbCol, endpoint.createIndex());
} else {
endpoint.ensureIndex(dbCol, dynamicIndex);
}
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Dynamic database and/or collection selected: {}->{}", dbCol.getDB().getName(), dbCol.getName());
}
return dbCol;
}
private boolean calculateBooleanValue(Boolean b) {
return b == null ? false : b.booleanValue();
}
private void processAndTransferWriteResult(WriteResult result, Exchange exchange) {
// if invokeGetLastError is set, or a WriteConcern is set which implicitly calls getLastError, then we have the chance to populate
// the MONGODB_LAST_ERROR header, as well as setting an exception on the Exchange if one occurred at the MongoDB server
if (endpoint.isInvokeGetLastError() || (endpoint.getWriteConcern() != null ? endpoint.getWriteConcern().callGetLastError() : false)) {
CommandResult cr = result.getCachedLastError() == null ? result.getLastError() : result.getCachedLastError();
exchange.getOut().setHeader(MongoDbConstants.LAST_ERROR, cr);
if (!cr.ok()) {
exchange.setException(MongoDbComponent.wrapInCamelMongoDbException(cr.getException()));
}
}
// determine where to set the WriteResult: as the OUT body or as an IN message header
if (endpoint.isWriteResultAsHeader()) {
exchange.getOut().setHeader(MongoDbConstants.WRITERESULT, result);
} else {
exchange.getOut().setBody(result);
}
}
private WriteConcern extractWriteConcern(Exchange exchange) throws CamelMongoDbException {
Object o = exchange.getIn().getHeader(MongoDbConstants.WRITECONCERN);
if (o == null) {
return null;
} else if (o instanceof WriteConcern) {
return ObjectHelper.cast(WriteConcern.class, o);
} else if (o instanceof String) {
WriteConcern answer = WriteConcern.valueOf(ObjectHelper.cast(String.class, o));
if (answer == null) {
throw new CamelMongoDbException("WriteConcern specified in the " + MongoDbConstants.WRITECONCERN + " header, with value " + o
+ " could not be resolved to a WriteConcern type");
}
}
// should never get here
LOG.warn("A problem occurred while resolving the Exchange's Write Concern");
return null;
}
@SuppressWarnings("rawtypes")
private List attemptConvertToList(List insertList, Exchange exchange) throws CamelMongoDbException {
List dbObjectList = new ArrayList(insertList.size());
TypeConverter converter = exchange.getContext().getTypeConverter();
for (Object item : insertList) {
try {
DBObject dbObject = converter.mandatoryConvertTo(DBObject.class, item);
dbObjectList.add(dbObject);
} catch (Exception e) {
throw new CamelMongoDbException("MongoDB operation = insert, Assuming List variant of MongoDB insert operation, but List contains non-DBObject items", e);
}
}
return dbObjectList;
}
private Message prepareResponseMessage(Exchange exchange, MongoDbOperation operation) {
Message answer = exchange.getOut();
MessageHelper.copyHeaders(exchange.getIn(), answer, false);
if (isWriteOperation(operation) && endpoint.isWriteResultAsHeader()) {
answer.setBody(exchange.getIn().getBody());
}
return answer;
}
private boolean isWriteOperation(MongoDbOperation operation) {
return MongoDbComponent.WRITE_OPERATIONS.contains(operation);
}
}
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