h1. What is the BC-Mail ?

h1. Component Configuration

{include:0 CDK Component Configuration Table}

\\
{include:0 CDK Parameter scope}

h1. Service Configuration

h2. Send mails

PROVIDE SERVICE : Import into the JBI environment an email account as a service, or use a generic SendMail service :

Petals Mail binding component allows JBI consumers to send mails to an email account. A JBI endpoint is registered into the JBI environment, and is linked to an smtp server, with an email address defined. When MailBC receives a message exchange from Petals platform, the content of the message is sent to the defined email address.

The component can also provide a generic SendMail service. This service allows the consumer to send a specific XML message to the component, which defines all the information needed to send an email. To use this generic service, the consumer has to call explicitely the {{\{service namespace}send}} operation.

The message send by the consumer has to respect the following definition :
{code:lang=xml}
<ns0:mail xmlns:ns0="http://petals.ow2.org/components/mail/version-3.0">
<ns0:from>from@from.com</ns0:from>
<ns0:reply>reply@reply.com</ns0:reply>
<ns0:to>to@to.com</ns0:to>
<ns0:subject>subject</ns0:subject>
<ns0:body>Hello, here is an email</ns0:body>
</ns0:mail>
{code}

\\
{center}
!mail_out.png!
*Sending mails*
{center}

* Step 1 : A JBI Consumer sends a Message Exchange to the Mail Binding Component.
* Step 2 : Mail Binding Component processes the Message Exchange : transforms it into a mail message and retrieve targeted External Provider Service (email address) linked to the endpoint set in the Message Exchange.
* Step 3 : Mail Binding Component sends this new mail to the targeted External Provider Service (Business Service, simple email account...).

h3. Service Unit descriptor

Petals Mail binding component can be configured by deploying a new service unit to it. The jbi descriptor ( jbi.xml file) of this service unit must contain a provides node describing the link between an internal jbi endpoint and an external email address. Here is an exemple of jbi descriptor activating a new "provided service" :

{code:lang=xml}
<?xml version="1.0" encoding="UTF-8"?>
<!-- JBI descriptor for PEtALS' "petals-bc-mail" (Mail), version 3.0 -->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:mail="http://petals.ow2.org/components/mail/version-3.0"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-4.0"
xmlns:generatedNs="http://test">

<!-- Import a Service into PEtALS or Expose a PEtALS Service => use a BC. -->
<jbi:services binding-component="true">

<!-- Import a Service into PEtALS => provides a Service. -->
<jbi:provides
interface-name="generatedNs:SendMail"
service-name="generatedNs:SendMailService"
endpoint-name="SendMailServiceEndpoint">

<!-- CDK specific elements -->
<petalsCDK:wsdl>sendMail.wsdl</petalsCDK:wsdl>

<!-- Component specific elements -->
<mail:scheme>smtp</mail:scheme>
<mail:host>smtp.host.com</mail:host>
<mail:port>25</mail:port>
<mail:user>user</mail:user>
<mail:password>password</mail:password>
<mail:from>from email address</mail:from>
<mail:reply>reply email address</mail:reply>
<mail:to>recipient address</mail:to>
<mail:subject>mail subject</mail:subject>
</jbi:provides>
</jbi:services>
</jbi:jbi>
{code}

\\
{include:0 CDK SU Provide Configuration}

todo

h3. Service Unit content

The Service Unit has to contain the following elements, packaged in an archive :

* The META-INF/jbi.xml descriptor file, has described above,
* An optional wsdl file describing the related service

{noformat}
su-mail.zip
+ META-INF
- jbi.xml
- service.xml
{noformat}

h3. Usage

Once a provides node is configured, you can start to send email via the mail binding component. You just have to send message exchange to endpoints activated by service unit deployments (containing jbi.xml with provides node).

{warning:title=warning}
InOnly or RobustInOnly message exchange patterns are allowed.
{warning}

h2. Receive mails

CONSUME SERVICE : Expose an internal JBI service outside the JBI environment that can be accessed by sending mails to an email account :

{center}
!mail_in.png!
*Receiving mails*
{center}

Petals Mail binding component (MailBC) allows to receive mails from external consumer and to bind them to message exchanges intinded to internal jbi components. To receive new mails, MailBC can be linked to specific mail stores. It will check these stores periodicaly to retrieve new mails. If it finds a new mail in a store, it will process it (map this mail to a message exchange) and send it to the targeted jbi endpoint. Then the mail is removed from the store. So, all mails (read or unread) in a store are considered as new mail.

* Step 1 : An External Consumer Entity (Business Service or simple mail client) sends an email to the registered Mail Store (a classical email account).
* Step 2 : Mail Binding Component periodicaly checks for new mails and imports them.
* Step 3 and 4 : Mail Binding Component processes this new mails : transforms them into Message Exchanges, sends them to targeted jbi components (step 4) and finally delete them from the mail Store.


h3. Service Unit descriptor

Petals Mail binding component can be configured by deploying a new service unit to it. The jbi descriptor (jbi.xml file) of this service unit must contains a consumes node describing the link between an external mail store and an internal jbi endpoint. Here is an exemple of jbi descriptor activating a new "consumed service" :

{code:lang=xml}
<?xml version="1.0" encoding="UTF-8"?>
<!-- JBI descriptor for PEtALS' "petals-bc-mail" (Mail), version 3.0 -->
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:mail="http://petals.ow2.org/components/mail/version-3.0"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-4.0"
xmlns:generatedNs="http://test">

<!-- Import a Service into PEtALS or Expose a PEtALS Service => use a BC. -->
<jbi:services binding-component="true">

<!-- Expose a PEtALS Service => consumes a Service. -->
<jbi:consumes
interface-name="generatedNs:Interface"
service-name="generatedNs:Service"
endpoint-name="Endpoint">

<!-- CDK specific elements -->
<petalsCDK:operation>operation</petalsCDK:operation>
<petalsCDK:mep>InOnly</petalsCDK:mep>

<!-- Component specific elements -->
<mail:scheme>pop3</mail:scheme>
<mail:host>pop.host.com</mail:host>
<mail:port>110</mail:port>
<mail:user>user</mail:user>
<mail:password>password</mail:password>
<mail:folder>INBOX</mail:folder>
<mail:period>60000</mail:period>
</jbi:consumes>
</jbi:services>
</jbi:jbi>
{code}

\\
{include:0 CDK SU Consume Configuration}

\\
{center}
{table-plus}
|| Parameter || Description || Default || Required ||
| scheme | the connection protocol (imap or pop3) | \- | Yes |
| username | the username used for authentication | \- | No |
| password | the password used for authentication. Can be null or empty | \- | No |
| host | the host used for connection | \- | Yes |
| port | the port used for connection | * imap : 143
* pop3 : 110 | No |
| folder | the folder to check for new mails | INBOX | No |
| period | the checking period time | 60 000 ms | No |
| expunge | Expunge deleted messages (read messages are marked as DELETED, default is TRUE) | true | No |
{table-plus}
*Configuration of a Service Unit to consume a service (Mail)*
{center}

h3. Service Unit content

The Service Unit has to contain the following elements, packaged in an archive :
* The META-INF/jbi.xml descriptor file, has described above

{noformat}
su-mail.zip
+ META-INF
- jbi.xml
{noformat}

h3. Usage

When a new email is in the INBOX folder of the configured email account, the content of the mail is forwarded to the JBI Service defined in the Consumes section of the Service Unit.

{warning:title}
The component sends exchange with the InOnly pattern only.
{warning}