MongoDB GridFS

URI format

mongodb-gridfs:connectionBean?database=databaseName&bucket=bucketName[&moreOptions...]

Configuring Options

Camel components are configured on two separate levels:

component level
endpoint level

Configuring Component Options

The component level is the highest level which holds general and common configurations that are inherited by the endpoints. For example a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

Configuring components can be done with the Component DSL, in a configuration file (application.properties|yaml), or directly with Java code.

Configuring Endpoint Options

Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders, which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse.

The following two sections lists all the options, firstly for the component followed by the endpoint.

Component Options

The MongoDB GridFS component supports 3 options, which are listed below.

Name	Description	Default	Type
bridgeErrorHandler (consumer)	Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.	false	boolean
lazyStartProducer (producer)	Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.	false	boolean
autowiredEnabled (advanced)	Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.	true	boolean

Name

Description

Default

Type

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

Endpoint Options

The MongoDB GridFS endpoint is configured using URI syntax:

mongodb-gridfs:connectionBean

with the following path and query parameters:

Path Parameters (1 parameters)

Name	Description	Default	Type
connectionBean (common)	Required Name of com.mongodb.client.MongoClient to use.		String

Name

Description

Default

Type

connectionBean (common)

Required Name of com.mongodb.client.MongoClient to use.

String

Query Parameters (16 parameters)

Name	Description	Default	Type
bucket (common)	Sets the name of the GridFS bucket within the database. Default is fs.	fs	String
database (common)	Required Sets the name of the MongoDB database to target.		String
readPreference (common)	Sets a MongoDB ReadPreference on the Mongo connection. Read preferences set directly on the connection will be overridden by this setting. The com.mongodb.ReadPreference#valueOf(String) utility method is used to resolve the passed readPreference value. Some examples for the possible values are nearest, primary or secondary etc.		ReadPreference
writeConcern (common)	Set the WriteConcern for write operations on MongoDB using the standard ones. Resolved from the fields of the WriteConcern class by calling the WriteConcern#valueOf(String) method. Enum values: ACKNOWLEDGED W1 W2 W3 UNACKNOWLEDGED JOURNALED MAJORITY		WriteConcern
delay (consumer)	Sets the delay between polls within the Consumer. Default is 500ms.	500	long
fileAttributeName (consumer)	If the QueryType uses a FileAttribute, this sets the name of the attribute that is used. Default is camel-processed.	camel-processed	String
initialDelay (consumer)	Sets the initialDelay before the consumer will start polling. Default is 1000ms.	1000	long
persistentTSCollection (consumer)	If the QueryType uses a persistent timestamp, this sets the name of the collection within the DB to store the timestamp.	camel-timestamps	String
persistentTSObject (consumer)	If the QueryType uses a persistent timestamp, this is the ID of the object in the collection to store the timestamp.	camel-timestamp	String
query (consumer)	Additional query parameters (in JSON) that are used to configure the query used for finding files in the GridFsConsumer.		String
queryStrategy (consumer)	Sets the QueryStrategy that is used for polling for new files. Default is Timestamp. Enum values: TimeStamp PersistentTimestamp FileAttribute TimeStampAndFileAttribute PersistentTimestampAndFileAttribute	TimeStamp	QueryStrategy
bridgeErrorHandler (consumer (advanced))	Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.	false	boolean
exceptionHandler (consumer (advanced))	To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.		ExceptionHandler
exchangePattern (consumer (advanced))	Sets the exchange pattern when the consumer creates an exchange. Enum values: InOnly InOut		ExchangePattern
operation (producer)	Sets the operation this endpoint will execute against GridFs.		String
lazyStartProducer (producer (advanced))	Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.	false	boolean

Name

Description

Default

Type

bucket (common)

Sets the name of the GridFS bucket within the database. Default is fs.

fs

String

database (common)

Required Sets the name of the MongoDB database to target.

String

readPreference (common)

Sets a MongoDB ReadPreference on the Mongo connection. Read preferences set directly on the connection will be overridden by this setting. The com.mongodb.ReadPreference#valueOf(String) utility method is used to resolve the passed readPreference value. Some examples for the possible values are nearest, primary or secondary etc.

ReadPreference

writeConcern (common)

Set the WriteConcern for write operations on MongoDB using the standard ones. Resolved from the fields of the WriteConcern class by calling the WriteConcern#valueOf(String) method.

Enum values:

ACKNOWLEDGED
W1
W2
W3
UNACKNOWLEDGED
JOURNALED
MAJORITY

WriteConcern

delay (consumer)

Sets the delay between polls within the Consumer. Default is 500ms.

500

long

fileAttributeName (consumer)

If the QueryType uses a FileAttribute, this sets the name of the attribute that is used. Default is camel-processed.

camel-processed

String

initialDelay (consumer)

Sets the initialDelay before the consumer will start polling. Default is 1000ms.

1000

long

persistentTSCollection (consumer)

If the QueryType uses a persistent timestamp, this sets the name of the collection within the DB to store the timestamp.

camel-timestamps

String

persistentTSObject (consumer)

If the QueryType uses a persistent timestamp, this is the ID of the object in the collection to store the timestamp.

camel-timestamp

String

query (consumer)

Additional query parameters (in JSON) that are used to configure the query used for finding files in the GridFsConsumer.

String

queryStrategy (consumer)

Sets the QueryStrategy that is used for polling for new files. Default is Timestamp.

Enum values:

TimeStamp
PersistentTimestamp
FileAttribute
TimeStampAndFileAttribute
PersistentTimestampAndFileAttribute

TimeStamp

QueryStrategy

bridgeErrorHandler (consumer (advanced))

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

exceptionHandler (consumer (advanced))

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer (advanced))

Sets the exchange pattern when the consumer creates an exchange.

Enum values:

InOnly
InOut

ExchangePattern

operation (producer)

Sets the operation this endpoint will execute against GridFs.

String

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

Message Headers

The MongoDB GridFS component supports 11 message header(s), which is/are listed below:

Name Description Default Type

Name	Description	Type
CamelFileContentType (consumer) Constant: `FILE_CONTENT_TYPE`	The content type of the file.	String
CamelFileLength (consumer) Constant: `FILE_LENGTH`	The size of the file.	long
CamelFileLastModified (consumer) Constant: `FILE_LAST_MODIFIED`	The size of the file.	Date
CamelFileName (producer) Constant: `FILE_NAME`	The name of the file.	String
Content-Type (producer) Constant: `CONTENT_TYPE`	The content type of the file.	String
CamelFileNameProduced (producer) Constant: `FILE_NAME_PRODUCED`	The file name produced.	String
gridfs.metadata (common) Constant: `GRIDFS_METADATA`	Any additional metadata stored along with the file in JSON format.	String
gridfs.operation (producer) Constant: `GRIDFS_OPERATION`	The operation to perform.	String
gridfs.chunksize (producer) Constant: `GRIDFS_CHUNKSIZE`	The number of bytes per chunk for the uploaded file.	Integer
gridfs.fileid (producer) Constant: `GRIDFS_FILE_ID_PRODUCED`	The ObjectId of the file produced.	ObjectId
gridfs.objectid (producer) Constant: `GRIDFS_OBJECT_ID`	The ObjectId of the file.	ObjectId

CamelFileContentType (consumer)

Constant: FILE_CONTENT_TYPE

The content type of the file.

String

CamelFileLength (consumer)

Constant: FILE_LENGTH

The size of the file.

long

CamelFileLastModified (consumer)

Constant: FILE_LAST_MODIFIED

The size of the file.

Date

CamelFileName (producer)

Constant: FILE_NAME

The name of the file.

String

Content-Type (producer)

Constant: CONTENT_TYPE

The content type of the file.

String

CamelFileNameProduced (producer)

Constant: FILE_NAME_PRODUCED

The file name produced.

String

gridfs.metadata (common)

Constant: GRIDFS_METADATA

Any additional metadata stored along with the file in JSON format.

String

gridfs.operation (producer)

Constant: GRIDFS_OPERATION

The operation to perform.

String

gridfs.chunksize (producer)

Constant: GRIDFS_CHUNKSIZE

The number of bytes per chunk for the uploaded file.

Integer

gridfs.fileid (producer)

Constant: GRIDFS_FILE_ID_PRODUCED

The ObjectId of the file produced.

ObjectId

gridfs.objectid (producer)

Constant: GRIDFS_OBJECT_ID

The ObjectId of the file.

ObjectId

Configuration of database in Spring XML

The following Spring XML creates a bean defining the connection to a MongoDB instance.

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="mongoBean" class="com.mongodb.Mongo">
        <constructor-arg name="host" value="${mongodb.host}" />
        <constructor-arg name="port" value="${mongodb.port}" />
    </bean>
</beans>

Sample route

The following route defined in Spring XML executes the operation findOne on a collection.

Get a file from GridFS

<route>
  <from uri="direct:start" />
  <!-- using bean 'mongoBean' defined above -->
  <to uri="mongodb-gridfs:mongoBean?database=${mongodb.database}&amp;operation=findOne" />
  <to uri="direct:result" />
</route>

GridFS operations - producer endpoint

count

Returns the total number of file in the collection, returning an Integer as the OUT message body.

// from("direct:count").to("mongodb-gridfs?database=tickets&operation=count");
Integer result = template.requestBodyAndHeader("direct:count", "irrelevantBody");
assertTrue("Result is not of type Long", result instanceof Integer);

You can provide a filename header to provide a count of files matching that filename.

Map<String, Object> headers = new HashMap<String, Object>();
headers.put(Exchange.FILE_NAME, "filename.txt");
Integer count = template.requestBodyAndHeaders("direct:count", query, headers);

listAll

Returns an Reader that lists all the filenames and their IDs in a tab separated stream.

// from("direct:listAll").to("mongodb-gridfs?database=tickets&operation=listAll");
Reader result = template.requestBodyAndHeader("direct:listAll", "irrelevantBody");

filename1.txt   1252314321
filename2.txt   2897651254

findOne

Finds a file in the GridFS system and sets the body to an InputStream of the content. Also provides the metadata has headers. It uses Exchange.FILE_NAME from the incoming headers to determine the file to find.

// from("direct:findOne").to("mongodb-gridfs?database=tickets&operation=findOne");
Map<String, Object> headers = new HashMap<String, Object>();
headers.put(Exchange.FILE_NAME, "filename.txt");
InputStream result = template.requestBodyAndHeaders("direct:findOne", "irrelevantBody", headers);

create

Creates a new file in the GridFs database. It uses the Exchange.FILE_NAME from the incoming headers for the name and the body contents (as an InputStream) as the content.

// from("direct:create").to("mongodb-gridfs?database=tickets&operation=create");
Map<String, Object> headers = new HashMap<String, Object>();
headers.put(Exchange.FILE_NAME, "filename.txt");
InputStream stream = ... the data for the file ...
template.requestBodyAndHeaders("direct:create", stream, headers);

remove

Removes a file from the GridFS database.

// from("direct:remove").to("mongodb-gridfs?database=tickets&operation=remove");
Map<String, Object> headers = new HashMap<String, Object>();
headers.put(Exchange.FILE_NAME, "filename.txt");
template.requestBodyAndHeaders("direct:remove", "", headers);

Spring Boot Auto-Configuration

When using mongodb-gridfs with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-mongodb-gridfs-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 4 options, which are listed below.

Name	Description	Default	Type
camel.component.mongodb-gridfs.autowired-enabled	Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.	true	Boolean
camel.component.mongodb-gridfs.bridge-error-handler	Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.	false	Boolean
camel.component.mongodb-gridfs.enabled	Whether to enable auto configuration of the mongodb-gridfs component. This is enabled by default.		Boolean
camel.component.mongodb-gridfs.lazy-start-producer	Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.	false	Boolean

Name

Description

Default

Type

camel.component.mongodb-gridfs.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.mongodb-gridfs.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.mongodb-gridfs.enabled

Whether to enable auto configuration of the mongodb-gridfs component. This is enabled by default.

Boolean

camel.component.mongodb-gridfs.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean