Camel file listener

Thank you! The problem is that i have to start the camelroute, and if i i dont work with an infinite loop the route stops immidiatly. Please taka look on this: Running Camel standalone and have it keep running — cslysy. The problem here is the same. I have to use an infinite loop to keep the route running. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. You must enable this option on both the producer and consumer side, so Camel knows the payloads is an Exchange and not a regular payload.

Use this with caution as the data is using Java Object serialization and requires the receiver to be able to deserialize the data at Class level, which forces a strong coupling between the producers and consumers having to use compatible Camel versions!. Interval in millis to sleep each time while waiting for provisional correlation id to be updated. To use a custom org. HeaderFilterStrategy to filter header to and from Camel message. Password to use with the ConnectionFactory.

Username to use with the ConnectionFactory. Specifies whether InOut operations request reply default to using transacted mode If this flag is set to true, then Spring JmsTemplate will have sessionTransacted set to true, and the acknowledgeMode as transacted on the JmsTemplate used for InOut operations.

Depending on the Java EE transaction context, the container makes its own decisions on these values. Analogously, these parameters are not taken into account within a locally managed transaction either, since Spring JMS operates on an existing JMS Session in this case. Setting this flag to true will use a short local JMS transaction when running outside of a managed transaction, and a synchronized local JMS transaction in case of a managed transaction other than an XA transaction being present.

This has the effect of a local JMS transaction being managed alongside the main transaction which might be a native JDBC transaction , with the JMS transaction committing right after the main transaction.

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. You can also add an instance of org. For example for Spring Boot you just have to define bean:. If you, for example, need to enable amqp.

When using amqp with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:. Whether to stop the JmsConsumer message listener asynchronously, when stopping a route. To use a shared JMS configuration.

The option is a org. JmsConfiguration type. The option is a javax. ConnectionFactory type. DestinationResolver type. Whether to enable auto configuration of the amqp component.

ErrorHandler type. Allows to control whether stacktraces should be logged or not, by the default errorHandler. Allows to configure the default errorHandler logging level for logging uncaught exceptions. ExceptionListener type. Specifies whether the listener session should be exposed when consuming messages. HeaderFilterStrategy type. Specify the limit for the number of consumers that are allowed to be idle at any given time.

MessageConverter type. MessageCreatedStrategy type. MessageListenerContainerFactory type. Specifies whether to inhibit the delivery of messages published by its own connection.

To use a custom QueueBrowseStrategy when browsing queues. QueueBrowseStrategy type. The timeout for receiving messages in milliseconds. The option is a long type. Allows you to specify a custom task executor for consuming messages. TaskExecutor type. When sending messages, specifies the time-to-live of the message in milliseconds. The Spring transaction manager to use.

PlatformTransactionManager type. Edit this Page. URI format amqp:[queue: topic:]destinationName[? Configuring Options Camel components are configured on two separate levels:. Configuring Component Options The component level is the highest level which holds general and common configurations that are inherited by the endpoints. 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.

Bytes Map Object Stream Text. Specifies whether the consumer container should auto-startup. Specifies whether to use persistent delivery by default for replies. Simple Default Custom. Specifies whether persistent delivery is used by default. Temporary Shared Exclusive. Sets whether synchronous processing should be strictly used. The timeout value of the transaction in seconds , if using transacted mode. Required Name of the queue or topic to use as destination.

Sets the exchange pattern when the consumer creates an exchange. To use a custom HeaderFilterStrategy to filter header to and from Camel message.

Spring Boot Auto-Configuration When using amqp with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:.

Name Description Default Type camel. String camel. Integer camel. JmsConfiguration camel. ConnectionFactory camel. ConsumerType camel. DefaultTaskExecutorType camel.

DestinationResolver camel. Boolean camel. ErrorHandler camel. LoggingLevel camel. ExceptionListener camel. HeaderFilterStrategy camel. JmsKeyFormatStrategy camel. JmsMessageType camel. MessageConverter camel. MessageCreatedStrategy camel. MessageListenerContainerFactory camel.

QueueBrowseStrategy camel. ReplyToType camel. TaskExecutor camel. PlatformTransactionManager camel. Sets the JMS selector to use. Enum values: Simple Default Custom. Enum values: ThreadPool SimpleAsync. Enum values: 1 2. Enum values: Temporary Shared Exclusive. Enum values: default passthrough.

Specifies whether to use transacted mode. By default, Camel will move consumed files to the. We have introduced a pre move operation to move files before they are processed.

This allows you to mark which files have been scanned as they are moved to this sub folder before being processed. The move and preMove options are Expression-based, so we have the full power of the File Language to do advanced configuration of the directory and name pattern. Camel will, in fact, internally convert the directory name you enter into a File Language expression. The moveFailed option allows you to move files that could not be processed successfully to another location such as an error folder of your choice.

Specifies the name of the file to write relative to the endpoint directory. This header is set by Camel and its purpose is providing end-users with the name of the file that was written. Is used for overruling CamelFileName header and use the value instead but only once, as the producer will remove this header after writing the file. The value can be only be a String. Notice that if the option fileName has been configured, then this is still being evaluated. Name of the consumed file as a relative file path with offset from the starting directory configured on the endpoint.

A boolean option specifying whether the consumed file denotes an absolute path or not. Should normally be false for relative paths. Absolute paths should normally not be used but we added to the move option to allow moving files to absolute paths. But can be used elsewhere as well. The absolute path to the file. For relative files this path holds the relative path instead. The file path. For absolute files this is the absolute path. As the file consumer implements the BatchConsumer it supports batching the files it polls.

By batching we mean that Camel will add the following additional properties to the Exchange, so you know the number of files polled, the current index, and whether the batch is already completed. A boolean value indicating the last Exchange in the batch. Is only true for the last entry. This allows you for instance to know how many files exist in this batch and for instance let the Aggregator2 aggregate this number of files. The charset option allows for configuring an encoding of the files on both the consumer and producer endpoints.

For example if you read utf-8 files, and want to convert the files to iso, you can do:. You can also use the convertBodyTo in the route.

In the example below we have still input files in utf-8 format, but we want to convert the file content to a byte array in iso format.

And then let a bean process the data. Before writing the content to the outbox folder using the current charset. If you omit the charset on the consumer endpoint, then Camel does not know the charset of the file, and would by default use "UTF-8". However you can configure a JVM system property to override and use a different default encoding with the key org.

In the example below this could be a problem if the files is not in UTF-8 encoding, which would be the default encoding for read the files. In this example when writing the files, the content has already been converted to a byte array, and thus would write the content directly as is without any further encodings. You can also override and control the encoding dynamic when writing files, by setting a property on the exchange with the key Exchange. For example in the route below we set the property with a value from a message header.

We suggest to keep things simpler, so if you pickup files with the same encoding, and want to write the files in a specific encoding, then favor to use the charset option on the endpoints. Notice that if you have explicit configured a charset option on the endpoint, then that configuration is used, regardless of the Exchange.

For example the route below will log the following:. When Camel is producing files writing files there are a few gotchas affecting how to set a filename of your choice. If such a filename is not desired, then you must provide a filename in the CamelFileName message header.

The constant, Exchange. And a syntax where we set the filename on the endpoint with the fileName URI option. Filename can be set either using the expression option or as a string-based File Language expression in the CamelFileName header. See the File Language for syntax and samples. Beware if you consume files from a folder where other applications write files to directly. Take a look at the different readLock options to see what suits your use cases.

The best approach is however to write to another folder and after the write move the file in the drop folder. You may also want to look at the doneFileName option, which uses a marker file done file to signal when a file is done and ready to be consumed. If you want only to consume files when a done file exists, then you can use the doneFileName option on the endpoint.

Will only consume files from the bar folder, if a done file exists in the same directory as the target files. However it is more common to have one done file per target file.

This means there is a correlation. To do this you must use dynamic placeholders in the doneFileName option. Currently Camel supports the following two dynamic tokens: file:name and file:name. The consumer only supports the static part of the done file name as either prefix or suffix not both. In this example only files will be polled if there exists a done file with the name file name.

For example. After you have written a file you may want to write an additional done file as a kind of marker, to indicate to others that the file is finished and has been written. To do that you can use the doneFileName option on the file producer endpoint.

Will for example create a file named done-foo. Will for example create a file named foo. Listen on a directory and create a message for each file dropped there. Copy the contents to the outputdir and delete the file in the inputdir. Will scan recursively into sub-directories.

Will lay out the files in the same directory structure in the outputdir as the inputdir , including any sub-directories. If you want to store the files in the outputdir directory in the same directory, disregarding the source directory layout e. Camel will by default move any processed file into a. The body will be a File object that points to the file that was just dropped into the inputdir directory.

Camel is of course also able to write files, i. In the sample below we receive some reports on the SEDA queue that we process before they are being written to a directory. Using a single route, it is possible to write a file to any number of subdirectories.

If you have a route setup as such:. You can have myBean set the header Exchange. Sometime you need to temporarily write the files to some directory relative to the destination directory. Such situation usually happens when some external process with limited filtering capabilities is reading from the directory you are writing to. Camel supports Idempotent Consumer directly within the component so it will skip already processed files.

Camel uses the absolute file name as the idempotent key, to detect duplicate files. You can customize this key by using an expression in the idempotentKey option. For example to use both the name and the file size as the key. By default Camel uses a in memory based store for keeping track of consumed files, it uses a least recently used cache holding up to entries.

In this section we will use the file based idempotent repository org. FileIdempotentRepository instead of the in-memory based that is used as default. This repository uses a 1st level cache to avoid reading the file repository. It will only use the file repository to store the content of the 1st level cache. Thereby the repository can survive server restarts. It will load the content of the file into the 1st level cache upon startup. The file structure is very simple as it stores the key in separate lines in the file.

By default, the file store has a size limit of 1mb. When the file grows larger Camel will truncate the file store, rebuilding the content by flushing the 1st level cache into a fresh empty file. We configure our repository using Spring XML creating our file idempotent repository and define our file consumer to use our repository with the idempotentRepository using sign to indicate Registry lookup:.

In this section we will use the JPA based idempotent repository instead of the in-memory based that is used as default. MessageProcessed as model. And yes then we just need to refer to the jpaStore bean in the file consumer endpoint using the idempotentRepository using the syntax option:. Camel supports pluggable filtering strategies. You can then configure the endpoint with such a filter to skip certain files being processed.

In the sample we have built our own filter that skips files starting with skip in the filename:. And then we can configure our route using the filter attribute to reference our filter using notation that we have defined in the spring XML file:.

See the URI options above for more information. Camel supports pluggable sorting strategies. This strategy it to use the build in java. Comparator in Java. You can then configure the endpoint with such a comparator and have Camel sort the files before being processed.

And then we can configure our route using the sorter option to reference to our sorter mySorter we have defined in the spring XML file:. In the Spring DSL route above notice that we can refer to beans in the Registry by prefixing the id with.

This strategy it to use the File Language to configure the sorting. The sortBy option is configured as follows:. Where each group is separated with semi colon. In the simple situations you just use one group, so a simple example could be:. This will sort by file name, you can reverse the order by prefixing reverse: to the group, so the sorting is now Z..

As we have the full power of File Language we can use some of the other parameters, so if we want to sort by file size we do:. You can configure to ignore the case, using ignoreCase: for string comparison, so if you want to use file name sorting but to ignore the case then we do:.

And then we want to group by name as a 2nd option so files with same modifcation is sorted by name:. Now there is an issue here, can you spot it?

Well the modified timestamp of the file is too fine as it will be in milliseconds, but what if we want to sort by date only and then subgroup by name?

Well as we have the true power of File Language we can use its date command that supports patterns. So this can be solved as:. Yeah, that is pretty powerful, oh by the way you can also use reverse per group, so we could reverse the file names:. The option processStrategy can be used to use a custom GenericFileProcessStrategy that allows you to implement your own begin , commit and rollback logic.

For instance lets assume a system writes a file in a folder you should consume. But you should not start consuming the file before another ready file has been written as well. In the begin method we can test whether the special ready file exists. The begin method returns a boolean to indicate if we can consume the file or not.

In the abort method special logic can be executed in case the begin operation returned false , for example to cleanup resources etc. The filter option allows you to implement a custom filter in Java code by implementing the org.

GenericFileFilter interface. This interface has an accept method that returns a boolean. Return true to include the file, and false to skip the file. There is a isDirectory method on GenericFile whether the file is a directory. This allows you to filter unwanted directories, to avoid traversing down unwanted directories. For example to skip any directories which starts with "skip" in the name, can be implemented as follows:.

If you want to use the Camel Error Handler to deal with any exception occurring in the file consumer, then you can enable the bridgeErrorHandler option as shown below:. So all you have to do is to enable this option, and the error handler in the route will take it from there.

When using file with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:. Whether to enable auto configuration of the file component. This is enabled by default. Edit this Page. File Since Camel 1. URI format file:directoryName[? Where directoryName represents the underlying file directory. Avoid reading files currently being written by another application.

Configuring Options Camel components are configured on two separate levels:. Configuring Component Options The component level is the highest level which holds general and common configurations that are inherited by the endpoints. 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.

Component Options The File 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. Query Parameters 94 parameters Name Description Default Type charset common This option is used to specify the encoding of the file.

If true, the file will be deleted after it is processed successfully. If a directory, will look for files in all the sub-directories as well.

Sets the exchange pattern when the consumer creates an exchange. Sets whether synchronous processing should be strictly used. Ant style filter inclusion. Multiple inclusions may be specified in comma-delimited format. The maximum depth to traverse when recursively processing a directory. Controls if fixed delay or fixed rate is used. To shuffle the list of files sort in random order. Pluggable sorter as a java.