Example configuration

Transport listener parameters

The following parameters are supported by both the HTTP and the HTTPS listener:

port

The TCP port to bind the listener to.

bind-address

The IP address to bind the listener to. This can be used on hosts that have more than one network interface or IP address to run multiple Synapse instances listening to the same port. If this parameter is not specified, the listener will accept connections on any IP address.

hostname

The host name to use when computing endpoint references in generated WSDL files. The default value is the host name as provided by the operation system or localhost if the host name can't be determined. The value of this parameter is ignored if WSDLEPRPrefix is specified.

WSDLEPRPrefix

The URL prefix to use when computing endpoint references in generated WSDL files. The value must be a valid URL with at least a protocol and host. If this value is unspecified, endpoint references will be computed based on the listener type (HTTP or HTTPS) and hostname and port parameters.

This parameter should be used if clients connect to Synapse through a frontend server, e.g. a (load balancing) Apache, and these clients rely on the address information in the WSDL documents exposed through ...?wsdl URLs.

The following parameters are specific to the HTTPS listener:

keystore

The keystore configuration. The value of this parameter must be a <KeyStore> element as shown in the example configurations above.

truststore

The truststore configuration. The value of this parameter must be a <TrustStore> element as shown in the example configurations above.

SSLVerifyClient

This parameter has the same meaning as the corresponding mod_ssl directive and sets the desired certificate verification level for client authentication:

• none (default): no client certificate is required at all
• optional: the client may present a valid certificate, but is not required to do so
• require: the client has to present a valid certificate, otherwise the connection request will be terminated during SSL handshake

Transport sender parameters

The following property can be used to control based on content-types whether the HTTP/HTTPS sender shall output a warning for responses with HTTP status code 500.

warnOnHTTP500

A list of content-types for which Synapse shall output a warning when receiving an HTTP 500 response (each value each separated by a |). By default, Synapse outputs a warning for any HTTP 500 response, irrespective of the content-type. Consequently, also for each SOAP fault a warning will be logged. If only for specific content-types a warning shall be logged, please provide a |-separated list. To output the warning for messages which do not have a content-type set, please use the value 'none'.

Example value: x-application/hessian|none

The following properties can be used to configure the HTTP sender to use a proxy. They can be specified either as transport parameters in declared in <transportSender> or as system properties.

http.proxyHost

The host name or address of the proxy server.

http.proxyPort

The TCP port of the proxy server.

http.nonProxyHosts

The hosts to which the HTTP sender should connect directly and not through the proxy server. The value can be a list of hosts, each separated by a |, and in addition a wildcard character (*) can be used for matching.

Example value: *.foo.com|localhost

Note that the HTTPS sender has no proxy support yet.

The following parameters are specific to the HTTPS sender:

keystore

The keystore configuration. The value of this parameter must be a <KeyStore> element as shown in the example configurations above.

truststore

The truststore configuration. The value of this parameter must be a <TrustStore> element as shown in the example configurations above.

novalidatecert

When set to true, this parameter disables server certificate validation (trust). The default value is false. This parameter will be ignored if truststore is set.

Setting his parameter to true is useful in development and test environments, but should not be used in production environments. If validation is disabled, a warning message will be logged at startup.

HostnameVerifier

This optional parameter specifies the policy to apply when checking that the hostname of the server matches the names stored inside the X.509 certificate presented by the server. Possible values are Strict, AllowAll and DefaultAndLocalhost. See the HostnameVerifier Javadoc for more details.

CertificateRevocationVerifier

This is an optional parameter to validate the revocation status of the host certificates using OCSP and CRL when making HTTPS connections. Simply uncomment this parameter in the axis2.xml file to enable the feature. Two LRU caches are used to cache CRLs and OCSP responses until they are expired. "CacheSize" property defines the maximum size of a cache. When this limit is reached, the old values will be automatically removed and updated with new values. "CacheDurationMins" is used to configure the time duration (in minutes) between two consecutive runs of the CacheManager task which periodically performs housekeeping work in each cache. Refer the example configuration above to see how to configure these properties. The scheduled CacheManager tasks for OCSP and CRL caches can be manually controlled using the JMX MBeans registered under the "CacheController" category.

Example configuration

Transport listener parameters

The following parameters are supported by both the HTTP and the HTTPS listener:

port

The TCP port to bind the listener to.

bind-address

The IP address to bind the listener to. This can be used on hosts that have more than one network interface or IP address to run multiple Synapse instances listening to the same port. If this parameter is not specified, the listener will accept connections on any IP address.

hostname

The host name to use when computing endpoint references in generated WSDL files. The default value is the host name as provided by the operation system or localhost if the host name can't be determined. The value of this parameter is ignored if WSDLEPRPrefix is specified.

WSDLEPRPrefix

The URL prefix to use when computing endpoint references in generated WSDL files. The value must be a valid URL with at least a protocol and host. If this value is unspecified, endpoint references will be computed based on the listener type (HTTP or HTTPS) and hostname and port parameters.

This parameter should be used if clients connect to Synapse through a frontend server, e.g. a (load balancing) Apache, and these clients rely on the address information in the WSDL documents exposed through ...?wsdl URLs.

The following parameters are specific to the HTTPS listener:

keystore

The keystore configuration. The value of this parameter must be a <KeyStore> element as shown in the example configurations above.

truststore

The truststore configuration. The value of this parameter must be a <TrustStore> element as shown in the example configurations above.

SSLVerifyClient

This parameter has the same meaning as the corresponding mod_ssl directive and sets the desired certificate verification level for client authentication:

• none (default): no client certificate is required at all
• optional: the client may present a valid certificate, but is not required to do so
• require: the client has to present a valid certificate, otherwise the connection request will be terminated during SSL handshake

Transport sender parameters

The following property can be used to control based on content-types whether the HTTP/HTTPS sender shall output a warning for responses with HTTP status code 500.

warnOnHTTP500

A list of content-types for which Synapse shall output a warning when receiving an HTTP 500 response (each value each separated by a |). By default, Synapse outputs a warning for any HTTP 500 response, irrespective of the content-type. Consequently, also for each SOAP fault a warning will be logged. If only for specific content-types a warning shall be logged, please provide a |-separated list. To output the warning for messages which do not have a content-type set, please use the value 'none'.

Example value: x-application/hessian|none

The following properties can be used to configure the HTTP sender to use a proxy. They can be specified either as transport parameters in declared in <transportSender> or as system properties.

http.proxyHost

The host name or address of the proxy server.

http.proxyPort

The TCP port of the proxy server.

http.nonProxyHosts

The hosts to which the HTTP sender should connect directly and not through the proxy server. The value can be a list of hosts, each separated by a |, and in addition a wildcard character (*) can be used for matching.

Example value: *.foo.com|localhost

Note that the HTTPS sender has no proxy support yet.

The following parameters are specific to the HTTPS sender:

keystore

The keystore configuration. The value of this parameter must be a <KeyStore> element as shown in the example configurations above.

truststore

The truststore configuration. The value of this parameter must be a <TrustStore> element as shown in the example configurations above.

novalidatecert

When set to true, this parameter disables server certificate validation (trust). The default value is false. This parameter will be ignored if truststore is set.

Setting his parameter to true is useful in development and test environments, but should not be used in production environments. If validation is disabled, a warning message will be logged at startup.

HostnameVerifier

This optional parameter specifies the policy to apply when checking that the hostname of the server matches the names stored inside the X.509 certificate presented by the server. Possible values are Strict, AllowAll and DefaultAndLocalhost. See the HostnameVerifier Javadoc for more details.

CertificateRevocationVerifier

This is an optional parameter to validate the revocation status of the host certificates using OCSP and CRL when making HTTPS connections. Simply uncomment this parameter in the axis2.xml file to enable the feature. Two LRU caches are used to cache CRLs and OCSP responses until they are expired. "CacheSize" property defines the maximum size of a cache. When this limit is reached, the old values will be automatically removed and updated with new values. "CacheDurationMins" is used to configure the time duration (in minutes) between two consecutive runs of the CacheManager task which periodically performs housekeeping work in each cache. Refer the example configuration above to see how to configure these properties. The scheduled CacheManager tasks for OCSP and CRL caches can be manually controlled using the JMX MBeans registered under the "CacheController" category.

Transport listener

The VFS transport listener receives messages dropped in a given local or remote file system location. The location is specified by a URL that either identifies a single file or a directory. The transport listener will periodically poll the specified location and process any file(s) found. After a file has been processed it will be deleted or moved to another location. Note that this is absolutely mandatory to prevent the listener from processing files multiple times. Therefore, the VFS transport listener can only be used in situations where it has write access to the file system location and where deleting or moving the dropped files is acceptable.

The transport is based on Apache Commons VFS and supports any protocol for which a VFS provider is available. The transport is pre-configured with providers for local files ( file: scheme), HTTP, HTTPS, FTP and SFTP (i.e. file transfer over SSH).

There is a fundamental difference between the VFS transport and transports such as HTTP and it is important to understand this difference to be able to use the VFS transport correctly. The HTTP transport binds to a single protocol endpoint, i.e. a TCP port on which it accepts incoming HTTP requests. These requests are then dispatched to the right service based on the request URI. On the other hand, the VFS transport only receives the payload of a message, but no additional information that could be used to dispatch the message to a service. This means that file system locations must be explicitly mapped to services. This is done using a set of service parameters.

For Synapse this means that the VFS transport listener can only be used in conjunction with proxy services. The relevant service parameters are then specified as follows:

In this example the file system location file:///var/spool/synapse/in is explicitly bound to MyVFSService , i.e. any message dropped in that location will be predispatched to that service, bypassing any other configured dispatch mechanisms that would apply to messages received through HTTP.

The VFS transport recognizes the following service parameters:

transport.vfs.FileURI(Required)

The primary File (or Directory) URI in the vfs* transport format, for this service

transport.vfs.ContentType (Required)

The expected content type for files retrieved for this service. The VFS transport uses this information to select the appropriate message builder.

Examples:

• text/xml for plain XML or SOAP
• text/plain; charset=ISO-8859-1 for text files
• application/octet-stream for binary data

transport.vfs.FileNamePattern (Optional)

A file name regex pattern to match files against a directory specified by the FileURI

transport.PollInterval (Optional)

The poll interval (in seconds)

transport.vfs.ActionAfterProcess (Optional)

DELETE or MOVE

transport.vfs.MoveAfterProcess (Optional)

The directory to move files after processing (i.e. all files process successfully)

transport.vfs.ActionAfterErrors (Optional)

DELETE or MOVE

transport.vfs.MoveAfterErrors (Optional)

The directory to move files after errors (i.e. some of the files succeed but some fail)

transport.vfs.ActionAfterFailure (Optional)

DELETE or MOVE

transport.vfs.MoveAfterFailure (Optional)

The directory to move after failure (i.e. all files fail)

transport.vfs.ReplyFileURI (Optional)

Reply file URI

transport.vfs.ReplyFileName (Optional)

Reply file name (defaults to response.xml)

transport.vfs.MoveTimestampFormat (Optional)

Timestamp prefix format for processed file name. java.text.SimpleDateFormat compatible string. e.g. yyMMddHHmmss'-'

transport.vfs.Locking (Optional)

By-default file locking is turned on in the VFS transport, and this parameter lets you configure the locking behaviour on a per service basis. Possible values are enable or disable, and both these values are important because the locking can be disabled at the global level by specifying that at the receiver level and selectively enable locking only for a set of services.

transport.vfs.Streaming (Optional)

If this parameter is set to true, the transport will attempt to use a javax.activation.DataSource (instead of a java.io.InputStream ) object to pass the content of the file to the message builder. Note that this is only supported by some message builders, e.g. for plain text and binary.

This allows processing of the message without storing the entire content in memory. It also has two other side effects:

• The incoming file (or connection in case of a remote file) will only be opened on demand.
• Since the data is not cached, the file might be read several times.

This option can be used to achieve streaming of large payloads. Note that this feature is still somewhat experimental and might be superseded by a more flexible mechanism in a future release.

Note that since the VFS endpoints are configured at the level of the service, the only parameter that is available at the listener is the file locking configuration parameter which is optional and the transport listener is enabled in axis2.xml simply as follows:

Transport sender

The VFS transport sender allows to write outgoing messages to local or remote files. As with the listener, the transport sender supports any protocol for which there is a VFS provider.

The sender is enabled be the following directive in axis2.xml file locking which is by-default enabled can be configured using the transport.vfs.Locking parameter:

To send a message using the VFS transport, the destination URI must start with vfs: followed by a valid VFS URL. For example, in a Synapse mediation, one would use:

Other examples of valid VFS URLs are (see http://commons.apache.org/vfs/filesystems.html for more samples):

• file:///directory/filename.ext
• file:////somehost/someshare/afile.txt
• jar:../lib/classes.jar!/META-INF/manifest.mf
• jar:zip:outer.zip!/nested.jar!/somedir
• ftp://myusername:mypassword@somehost/pub/downloads/somefile.tgz[?vfs.passive=true]

The global configuration of the file locking can be overriden by providing the transport.vfs.Locking as a URL parameter with the appropriate value ( enable, or disable) on a given endpoint.

It should be noted that by its nature, the VFS transport sender doesn't support synchronous responses and should only be invoked using the out-only message exchange pattern. In a Synapse mediation, this can be forced using the following mediator:

Using SFTP

To avoid man-in-the-middle attacks, SSH clients will only connect to hosts with a known host key. When connecting for the first time to an SSH server, a typical command line SSH client would request confirmation from the user to add the server and its fingerprint to the list of known hosts.

The VFS transports supports SFTP through the JSch library and this library also requires a list of known hosts. Since Synapse is not an interactive process, it can't request confirmation from the user and is therefore unable to automatically add a host to the list. This implies that the list of known hosts must be set up manually before the transport can connect.

Jsch loads the list of known hosts from a file called known_hosts in the .ssh sub-directory of the user's home directory, i.e. $HOME/.ssh in Unix and %HOMEPATH%\.ssh in Windows. The location and format of this file are compatible with the OpenSSH client.

Since the file not only contains a list of host names but also the fingerprints of their host keys, the easiest way to add a new host to that file is to simply use the OpenSSH client to open an SSH session on the target host. The client will then ask to add the credentials to the known_hosts file. Note that if the SSH server is configured to only allow SFTP sessions, but no interactive sessions, the connection will actually fail. Since this doesn't rollback the change to the known_hosts file, this error can be ignored.

Known issues

The VFS listener will start reading a file as soon as it appears in the configured location. To avoid processing half written files, the creation of these files should be made atomic. On most platforms, this can be achieved by writing the data to a temporary file and then moving the file to the target location. Note however that a move operation is only atomic if the source and destination are on the same physical file system. The location for the temporary file should be chosen with that constraint in mind.

It should also be noted that the VFS transport sender doesn't create files atomically.

Setting up the FIX Transport

To use the FIX transport, you need a local Quickfix/J installation. Download Quickfix/J from http://www.quickfixj.org/downloads .

To enable the FIX transport, you need to uncomment the FIX transport sender and FIX transport receiver configurations in the SYNAPSE_HOME/repository/conf/axis2.xml. Simply locate and uncomment the FIXTransportSender and FIXTransportListener sample configurations. Also, add the following jars to the Synapse class path (SYNAPSE_HOME/lib directory).

• quickfixj-core.jar
• quickfixj-msg-fix40.jar
• quickfixj-msg-fix41.jar
• quickfixj-msg-fix42.jar
• quickfixj-msg-fix43.jar
• quickfixj-msg-fix44.jar
• mina-core.jar
• slf4j-api.jar
• slf4j-jdk14.jar

All these jars are shipped with the Quickfix/J binary distribution.

FIX Transport Parameters

This is the list of all parameters accepted by the FIX transport. Refer the sample 257 and 258 to see how some of them are used in practice.

transport.fix.AcceptorConfigURL

If a service needs to listen to incoming FIX messages from a remote initiator, then Synapse needs to create an acceptor. This parameter should contain the URL of the file which contains the FIX configuration for the acceptor. (See sample 257)

transport.fix.InitiatorConfigURL

If a service needs to send FIX messages to a remote acceptor Synapse should create an initiator. This parameter should contain the URL of the file which contains the FIX configuration for the initiator. (See sample 257)

transport.fix.AcceptorMessageStore

The type of message store to be used with the acceptor. Allowed values for this parameter are 'file', 'jdbc', 'memory' and 'sleepycat'. If not specified memory based message store will be used by default. Additional parameters required to configure each of the message stores should be specified in the acceptor configuration file.

transport.fix.InitiatorMessageStore

Same as the above but applies only for the initiators. Additional parameters required to configure each of the message stores should be specified in the initiator configuration file.

transport.fix.AcceptorLogFactory

Specifies the transport level log factory to be used to log messages going through the acceptor. FIX messages are logged without putting them in SOAP envelopes at this level. Accepted values are 'console', 'file' and 'jdbc'. If not specified no logging will be done at the transport level. Additional parameters required to configure each of the lof factories should be specified in the acceptor configuration file.

transport.fix.InitiatorLogFactory

Specifies the transport level log factory to be used to log messages going through the initiator. Functionality is similar to the above. Additional parameters required to configure each of the lof factories should be specified in the initiator configuration file.

transport.fix.ResponseDeliverToCompID

If a response FIX message sent from Synapse to a remote FIX engine should be forwarded from the remote engine to another party, this parameter can be used to set the DeliverToCompID field of the messages at Synapse.

transport.fix.ResponseDeliverToSubID

If a response FIX message sent from Synapse to a remote FIX engine should be forwarded from the remote engine to another party, this parameter can be used to set the DeliverToSubID field of the messages at Synapse.

transport.fix.ResponseDeliverToLocationID

If a response FIX message sent from Synapse to a remote FIX engine should be forwarded from the remote engine to another party, this parameter can be used to set the DeliverToLocationID field of the messages at Synapse.

transport.fix.ServiceName

Used when messages coming over a different protocol has to be forwarded over FIX. The value must be equal to the name of the service and the scope must be 'axis2-client' (See sample 258)

transport.fix.SendAllToInSequence

When there are multiple responses to a FIX request and when we need only one of them to be sent to the original requester this parameter has to be set to 'false'. This mostly comes handy when the original requester is communicating over a different protocol (like HTTP). If this parameter is not set to 'false' at such scenarios messages might get into a loop. (See sample 258)

transport.fix.BeginStringValidation

When the FIX messages sent to Synapse should not be forwarded to a FIX session with a different BeginString value this parameter can be set to 'true'. Setting this parameter to 'true' will enforce this restriction.

Setting Up the Transport

AMQP transport is based on the widely used Java AMQP client library from RabbitMQ. The client library is not distributed with Apache Synapse, and hence in order to use the AMQP transport, download the RabbitMQ Java client and copy the client library (rabbitmq-client.jar) into Synapse classpath (SYNAPSE_HOME/lib directory).

To enable the AMQP transport, uncomment the AMQP transport sender and AMQP transport receiver configurations in the SYNAPSE_HOME/repository/conf/axis2.xml.

AMQP Transport Parameters

Following parameters can be configured as part of AMQP transport receiver, sender, a proxy service or an AMQP endpoint declaration.

transport.amqp.Uri

The connection URL for the broker of the form amqp://userName:password@hostName:portNumber/virtualHost

transport.amqp.BrokerList

The list of broker of the form, host1:port1,host2:port2... which will be used as the address array in AMQP connection to the broker

transport.amqp.ExchangeName

The name of the exchange to connect

transport.amqp.IsExchangeDurable

Should the exchange be declared as durable?

transport.amqp.IsExchangeAutoDelete

Should the exchange be auto delete? Possible values are true or false

transport.amqp.ChannelPreFetchSize

The channel pre fetch size for fair dispatch

transport.amqp.ChannelPreFetchCountSize

The channel prefetch count for fair dispatch

transport.amqp.ExchangeType

Type of the exchange to use. Possible values are, fanout, direct, header or topic

transport.amqp.ExchangeInternal

Should the exchange be declared as internal? Possible values are true or false

transport.amqp.BindExchange

The name of the exchange that the publisher/consumer should publish/consume message to.

transport.amqp.BindingKeys

The comma separated binding keys this queue should be bound into exchange

transport.amqp.RoutingKey

The routing key to be used by the publisher.

transport.amqp.ConsumerTx

Use transactions at consumer side if set to true. By default, this will be considered false and explicit acknowledgement will be done

transport.amqp.QueueName

The name of the queue

transport.amqp.IsQueueDurable

Should the queue declare as durable? Possible values are true or false.

transport.amqp.IsQueueRestricted

Should the queue declare as restricted? Possible values are true or false.

transport.amqp.IsQueueAutoDelete

Should the queue declare as auto delete when it's no longer in use?. Possible values are true or false.

transport.amqp.OperateOnBlockingMode

True if the polling task should wait until it process the accepted messages. This can be used in conjunction with a single thread polling task (in the whole transport, i.e. only a single AMQP proxy per flow) to achieve in order delivery

transport.amqp.ConnectionFactoryName

The connection factory to be used either with consumer or producer.

transport.amqp.ResponseConnectionFactoryName

In a two-way scenario, which connection factory of the senders' should be used to send the response

transport.amqp.ScheduledTaskInitialDelay

The initial delay (in milliseconds) that the polling task should delay before initial attempt

transport.amqp.ScheduledTaskDelay

The delay (in milliseconds) that the polling task should delay before next attempt.

transport.amqp.ScheduledTaskTimeUnit

The time unit which should use to calculate, transport.amqp.ScheduledTaskInitialDelay and transport.amqp.ScheduledTaskDelay.

transport.amqp.NoOfConcurrentConsumers

Number of concurrent consumers per polling task.

transport.amqp.NoOfDispatchingTask

Number of dispatching task to use any request messages to actual processing task.

transport.amqp.ContentType

Configure the content type as a service parameter.

AMQP_CONTENT_TYPE

Message context property to set the AMQP message content type.

AMQP_CONTENT_ENCODING

Message context property to set the AMQP message encoding

AMQP_HEADER_*

Specify any AMQP headers as message context properties using AMQP_HEADER_*

AMQP_DELIVERY_MODE

Message context property to set the AMQP message delivery mode

AMQP_PRIORITY

Message context property to set the AMQP message priority.

AMQP_CORRELATION_ID

Message context property to set the AMQP message correlation id

AMQP_REPLY_TO

Message context property to set the AMQP message reply to header.

AMQP_EXPIRATION

Message context property to set the AMQP expiration.

AMQP_MESSAGE_ID

Message context property to set the message id of the AMQP message

AMQP_TIME_STAMP

Message context property to set the timestamp of the AMQP message.

AMQP_TYPE

Message context property to set the type of the AMQP message

AMQP_PRODUCER_TX

Use transactions at producer side. Possible values are tx(for blocking transactions), lwpc(for light weight producer connections).

connection-factory-pool-size

A system property to set the worker pool size of the connection factory executor service.

worker-pool-size

A system property to set the worker pool size used by deployed services for polling broker.

semaphore-time-out

A system property to set the timeout (in seconds) of semaphore which waits for a response.

initial-reconnect-duration

If a polling task encounter an exception due to some reason(most probably due to broker outage) it will be suspended until a successful re-connect. This system property defines the initial duration that the re-connection check task should be suspended (1000 ms by default) before next re-try.

reconnection-progression-factor

A system property to define the factor (2.0 by default) to multiply the initial suspended duration to calculate the next suspending duration for the re-connection check task.

maximum-reconnection-duration

The maximum duration that re-connection check task should be suspended( 10 minutes by default). After this time is reached, the suspended duration will be fall back to its original initial configured duration.

Sample Configurations

Producer example

Consumer example

Routing example

Producer transactions