ServiceMix File

The ServiceMix File component provides JBI integration to the file system. It can be used to read & write files via URI or to periodically poll directories for new files.

Maven Archetype

The servicemix-file-service-unit archetype creates a File Service Unit which contains both poller and sender endpoints sample:

mvn archetype:create \
  -DarchetypeGroupId=org.apache.servicemix.tooling \
  -DarchetypeArtifactId=servicemix-file-service-unit \
  -DarchetypeVersion=2010.01 \
  -DgroupId=your.group.id \
  -DartifactId=your.artifact.id \
  -Dversion=your-version

Once you've customized the service unit, simply install the SU:

mvn install

Remember that to be deployable in ServiceMix, the ServiceUnit has to be embedded in a Service Assembly: only the Service Assembly zip file can be deployed in ServiceMix.
To add your SU in a SA, you need to define it in the dependency sets:

<dependency>
  <groupId>your.group.id</groupId>
  <artifactId>your.artifact.id</artifactId>
  <version>your-version</version>
</dependency>

Endpoints Configuration

Poller Endpoint

The File Poller endpoint polls file in a given directory, read it using the marshaler, and send marshaled file content to the NMR.

<file:poller service="test:poller"
             endpoint="poller"
             targetService="test:receiver"
             file="file:target/pollerFiles" />

Poller generates an InOnly message.

Name	Type	Description	Default
service	QName	the service name of the endpoint	required to be spec'd
endpoint	string	the endpoint name of the endpoint	required to be spec'd
interfaceName	QName	the interface name of the endpoint
targetService	QName	the service name of the target endpoint
targetEndpoint	string	the endpoint name of the target endpoint
targetInterface	QName	the interface name of the target endpoint
targetUri	string	the uri of the target endpoint
autoCreateDirectory	boolean	creates dir if doesn't exist	true
firstTime	date	datetime before first poll can take place	null (first poll right after start)
delay	long	amount of time first polling is delayed after start	0
period	long	amount of time between polls	5000
file	string	sets the file or directory to poll	null (must be spec'd)
deleteFile	boolean	delete file when it is processed	true
recursive	boolean	process sub directories	true
marshaler	class	org.apache.servicemix.components.util.FileMarshaler	DefaultFileMarshaler
lockManager	class	org.apache.servicemix.locks.LockManager	SimpleLockManager
filter	class	java.io.FileFilter (optional filter)	null - no filter
scheduler	class	org.apache.servicemix.components.varscheduler.Scheduler	new Scheduler(true)
comparator	class	implementation of java.util.Comparator<File> interface	null - no ordering
archive	string	sets the directory to archive files before deleting them (available since 3.2)	null (no archiving)

Sender Endpoint

A File Sender endpoint expects messages coming from the NMR, converts it to file content (using the marshaler) and write file in the given directory.

<file:sender service="test:service"
             endpoint="endpoint"
             directory="file:target/pollerFiles" />

Name	Type	Description	Default
service	QName	the service name of the endpoint	required to be spec'd
endpoint	string	the endpoint name of the endpoint	required to be spec'd
directory	file		required to be spec'd
autoCreateDirectory	boolean		true
append	boolean	append to an existing file instead of overwriting it (3.3 or above)	false
marshaler	class	org.apache.servicemix.components.util.FileMarshaler	DefaultFileMarshaler
tempFilePrefix	string		"servicemix-"
tempFileSuffix	string		".xml"

URI

You can use the familiar file URI to communicate with files

file:foo.xml
file://path/to/something

Filtering

Filtering of files to use during the polling process can be accomplished by configuring the filter property.

<file:poller service="test:poller" endpoint="poller"
	file="file:inbox" targetService="test:service"
	targetEndpoint="endpoint" period="10000" recursive="true">
	<property name="filter">
		<bean class="org.apache.oro.io.GlobFilenameFilter">
			<constructor-arg value="*.xml" />
		</bean>
	</property>
</file:poller>

In the example above, the Apache ORO jar must be in the classpath. See: http://jakarta.apache.org/oro/

<file:poller service="test:poller" endpoint="poller"
	file="file:inbox" targetService="test:service"
	targetEndpoint="endpoint" period="10000" recursive="true">
        <property name="filter">
            <bean class="org.apache.commons.io.filefilter.WildcardFilter">
                <constructor-arg value="*.csv" />
            </bean>
        </property>
</file:poller>

In the example above it uses Apache Commons IO WildcardFilter as it implements FileFilter. The Apache Commons IO jar file must be in the classpath. See: http://commons.apache.org/io/

Comparators

You can define an implementation of the java.util.Comparator interface to specifies the process order of the files.

For example, you can process file sorted by file name. You can implement the following comparator:

public class NameComparator implements Comparator<File> {
    
    /*
     * (non-Javadoc)
     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
     */
    public int compare(File file1, File file2) {
        return file1.getPath().compareTo(file2.getPath());
    }

}

and use it in the endpoint definition:

<file:poller service="test:poller" endpoint="poller"
	file="file:inbox" targetService="test:service"
	targetEndpoint="endpoint" period="10000" recursive="true">
        <property name="comparator">
            <bean class="your.package.NameComparator"/>
        </property>
</file:poller>

We provide the following comparators:

Class Name	Description
org.apache.servicemix.file.comparator.FileNameComparator	Compare the files based on the file name/path (alphanumeric sorted)
org.apache.servicemix.file.comparator.LastModificationDateComparator	Compare the files based on the last modification date (from oldest to newest)
org.apache.servicemix.file.comparator.SizeComparator	Compare the files based on the file length (from smallest to biggest)

Marshalers

By default, poller endpoints expect the content of the file to be in xml format.

<file:sender service="test:service" endpoint="endpoint" directory="file:target/componentOutput">
  <file:marshaler>
    <sm:defaultFileMarshaler>
      <sm:fileName>
        <!-- lets use a header from the message -->
        <sm:xpathString xpath="concat($name, '.xml')"/>
      </sm:fileName>
    </sm:defaultFileMarshaler>
  </file:marshaler>
</file:sender>

Below is an example of a non-XML file marshaler that moves a file from an inbox to an outbox directory. The binary marshaler sends a message with the file attached. This allows any file to be processed.

The contents below were used in an xbean.xml file for a service unit named filemover

<?xml version="1.0"?>
<beans xmlns:f="http://servicemix.apache.org/file/1.0"
       xmlns:proj="http://servicemix.apache.org/samples/filemover"
       xmlns:sm="http://servicemix.apache.org/config/1.0">

  <f:sender service="proj:fileSender"
                 endpoint="endpoint"
                 directory="file:///C:/opensrc/test/myOutbox"
                 autoCreateDirectory="true">

    <property name="marshaler">
      <bean class="org.apache.servicemix.components.util.BinaryFileMarshaler" />
    </property>
  </f:sender>


  <f:poller
      service="proj:filePoller"
      endpoint="poller"
      file="file:///C:/opensrc/test/myInbox"
      targetService="proj:fileSender"
      targetEndpoint="endpoint"
      period="60000"
      recursive="true"
      autoCreateDirectory="true">

      <property name="marshaler">
        <bean class="org.apache.servicemix.components.util.BinaryFileMarshaler" />
      </property>
    </f:poller>
</beans>