org.apache.camel
Interface Exchange

All Known Implementing Classes:

DefaultExchange

public interface Exchange

An Exchange is the message container holding the information during the entire routing of a Message received by a Consumer.

During processing down the Processor chain, the Exchange provides access to the current (not the original) request and response Message messages. The Exchange also holds meta-data during its entire lifetime stored as properties accessible using the various getProperty(String) methods. The setProperty(String, Object) is used to store a property. For example you can use this to store security, SLA related data or any other information deemed useful throughout processing. If an Exchange failed during routing the Exception that caused the failure is stored and accessible via the getException() method.

An Exchange is created when a Consumer receives a request. A new Message is created, the request is set as the body of the Message and depending on the Consumer other Endpoint and protocol related information is added as headers on the Message. Then an Exchange is created and the newly created Message is set as the in on the Exchange. Therefore an Exchange starts its life in a Consumer. The Exchange is then sent down the Route for processing along a Processor chain. The Processor as the name suggests is what processes the Message in the Exchange and Camel, in addition to providing out-of-the-box a large number of useful processors, it also allows you to create your own. The rule Camel uses is to take the out Message produced by the previous Processor and set it as the in for the next Processor. If the previous Processor did not produce an out, then the in of the previous Processor is sent as the next in. At the end of the processing chain, depending on the Message Exchange Pattern (or MEP) the last out (or in of no out available) is sent by the Consumer back to the original caller.

Camel, in addition to providing out-of-the-box a large number of useful processors, it also allows you to implement and use your own. When the Exchange is passed to a Processor, it always contains an in Message and no out Message. The Processor may produce an out, depending on the nature of the Processor. The in Message can be accessed using the getIn() method. Since the out message is null when entering the Processor, the getOut() method is actually a convenient factory method that will lazily instantiate a DefaultMessage which you could populate. As an alternative you could also instantiate your specialized Message and set it on the exchange using the setOut(org.apache.camel.Message) method. Please note that a Message contains not only the body but also headers and attachments. If you are creating a new Message the headers and attachments of the in Message are not automatically copied to the out by Camel and you'll have to set the headers and attachments you need yourself. If your Processor is not producing a different Message but only needs to slightly modify the in, you can simply update the in Message returned by getIn().

See this FAQ entry for more details.

Field Summary

static String	ACCEPT_CONTENT_TYPE
static String	AGGREGATED_COMPLETED_BY
static String	AGGREGATED_CORRELATION_KEY
static String	AGGREGATED_SIZE
static String	AGGREGATED_TIMEOUT
static String	AGGREGATION_COMPLETE_ALL_GROUPS
static String	AGGREGATION_STRATEGY
static String	ASYNC_WAIT
static String	AUTHENTICATION
static String	AUTHENTICATION_FAILURE_POLICY_ID
static String	BATCH_COMPLETE
static String	BATCH_INDEX
static String	BATCH_SIZE
static String	BEAN_METHOD_NAME
static String	BEAN_MULTI_PARAMETER_ARRAY
static String	BINDING
static String	BREADCRUMB_ID
static String	CHARSET_NAME
static String	CONTENT_ENCODING
static String	CONTENT_LENGTH
static String	CONTENT_TYPE
static String	CORRELATION_ID
static String	CREATED_TIMESTAMP
static String	DATASET_INDEX
static String	DEFAULT_CHARSET_PROPERTY
static String	DESTINATION_OVERRIDE_URL
static String	DISABLE_HTTP_STREAM_CACHE
static String	DUPLICATE_MESSAGE
static String	ERRORHANDLER_HANDLED
static String	EVALUATE_EXPRESSION_RESULT
static String	EXCEPTION_CAUGHT
static String	EXTERNAL_REDELIVERED
static String	FAILURE_ENDPOINT
static String	FAILURE_HANDLED
static String	FILE_LAST_MODIFIED
static String	FILE_LOCAL_WORK_PATH
static String	FILE_LOCK_FILE_ACQUIRED
static String	FILE_NAME
static String	FILE_NAME_ONLY
static String	FILE_NAME_PRODUCED
static String	FILE_PARENT
static String	FILE_PATH
static String	FILTER_MATCHED
static String	FILTER_NON_XML_CHARS
static String	GROUPED_EXCHANGE
static String	HTTP_BASE_URI
static String	HTTP_CHARACTER_ENCODING
static String	HTTP_CHUNKED
static String	HTTP_METHOD
static String	HTTP_PATH
static String	HTTP_PROTOCOL_VERSION
static String	HTTP_QUERY
static String	HTTP_RESPONSE_CODE
static String	HTTP_SERVLET_REQUEST
static String	HTTP_SERVLET_RESPONSE
static String	HTTP_URI
static String	HTTP_URL
static String	INTERCEPTED_ENDPOINT
static String	LANGUAGE_SCRIPT
static String	LOG_DEBUG_BODY_MAX_CHARS
static String	LOG_DEBUG_BODY_STREAMS
static String	LOOP_INDEX
static String	LOOP_SIZE
static String	MAXIMUM_CACHE_POOL_SIZE
static String	MAXIMUM_ENDPOINT_CACHE_SIZE
static String	MULTICAST_COMPLETE
static String	MULTICAST_INDEX
static String	NOTIFY_EVENT
static String	ON_COMPLETION
static String	PARENT_UNIT_OF_WORK
static String	RECEIVED_TIMESTAMP
static String	REDELIVERED
static String	REDELIVERY_COUNTER
static String	REDELIVERY_DELAY
static String	REDELIVERY_EXHAUSTED
static String	REDELIVERY_MAX_COUNTER
static String	ROLLBACK_ONLY
static String	ROLLBACK_ONLY_LAST
static String	ROUTE_STOP
static String	SKIP_GZIP_ENCODING
static String	SLIP_ENDPOINT
static String	SOAP_ACTION
static String	SPLIT_COMPLETE
static String	SPLIT_INDEX
static String	SPLIT_SIZE
static String	TIMER_COUNTER
static String	TIMER_FIRED_TIME
static String	TIMER_NAME
static String	TIMER_PERIOD
static String	TIMER_TIME
static String	TO_ENDPOINT
static String	TRACE_EVENT
static String	TRACE_EVENT_EXCHANGE
static String	TRACE_EVENT_NODE_ID
static String	TRACE_EVENT_TIMESTAMP
static String	TRANSFER_ENCODING
static String	UNIT_OF_WORK_EXHAUSTED
static String	UNIT_OF_WORK_PROCESS_SYNC
static String	XSLT_FILE_NAME

Method Summary

void	addOnCompletion(Synchronization onCompletion) Adds a Synchronization to be invoked as callback when this exchange is completed.
Exchange	copy() Creates a copy of the current message exchange so that it can be forwarded to another destination
CamelContext	getContext() Returns the container so that a processor can resolve endpoints from URIs
Exception	getException() Returns the exception associated with this exchange
<T> T	getException(Class<T> type) Returns the exception associated with this exchange.
String	getExchangeId() Returns the exchange id (unique)
Endpoint	getFromEndpoint() Returns the endpoint which originated this message exchange if a consumer on an endpoint created the message exchange, otherwise this property will be null
String	getFromRouteId() Returns the route id which originated this message exchange if a route consumer on an endpoint created the message exchange, otherwise this property will be null
Message	getIn() Returns the inbound request message
<T> T	getIn(Class<T> type) Returns the inbound request message as the given type
Message	getOut() Returns the outbound message, lazily creating one if one has not already been associated with this exchange.
<T> T	getOut(Class<T> type) Returns the outbound request message as the given type Important: If you want to change the current message, then use getIn() instead as it will ensure headers etc.
ExchangePattern	getPattern() Returns the ExchangePattern (MEP) of this exchange.
Map<String,Object>	getProperties() Returns all of the properties associated with the exchange
Object	getProperty(String name) Returns a property associated with this exchange by name
<T> T	getProperty(String name, Class<T> type) Returns a property associated with this exchange by name and specifying the type required
Object	getProperty(String name, Object defaultValue) Returns a property associated with this exchange by name
<T> T	getProperty(String name, Object defaultValue, Class<T> type) Returns a property associated with this exchange by name and specifying the type required
UnitOfWork	getUnitOfWork() Returns the unit of work that this exchange belongs to; which may map to zero, one or more physical transactions
List<Synchronization>	handoverCompletions() Handover all the on completions from this exchange
void	handoverCompletions(Exchange target) Handover all the on completions from this exchange to the target exchange.
boolean	hasOut() Returns whether an OUT message has been set or not.
boolean	hasProperties() Returns whether any properties has been set
Boolean	isExternalRedelivered() Returns true if this exchange is an external initiated redelivered message (such as a JMS broker).
boolean	isFailed() Returns true if this exchange failed due to either an exception or fault
boolean	isRollbackOnly() Returns true if this exchange is marked for rollback
boolean	isTransacted() Returns true if this exchange is transacted
Object	removeProperty(String name) Removes the given property on the exchange
void	setException(Throwable t) Sets the exception associated with this exchange Camel will wrap Throwable into Exception type to accommodate for the getException() method returning a plain Exception type.
void	setExchangeId(String id) Set the exchange id
void	setFromEndpoint(Endpoint fromEndpoint) Sets the endpoint which originated this message exchange.
void	setFromRouteId(String fromRouteId) Sets the route id which originated this message exchange.
void	setIn(Message in) Sets the inbound message instance
void	setOut(Message out) Sets the outbound message
void	setPattern(ExchangePattern pattern) Allows the ExchangePattern (MEP) of this exchange to be customized.
void	setProperty(String name, Object value) Sets a property on the exchange
void	setUnitOfWork(UnitOfWork unitOfWork) Sets the unit of work that this exchange belongs to; which may map to zero, one or more physical transactions

Field Detail

AUTHENTICATION

static final String AUTHENTICATION

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Constant Field Values

AUTHENTICATION_FAILURE_POLICY_ID

static final String AUTHENTICATION_FAILURE_POLICY_ID

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ACCEPT_CONTENT_TYPE

static final String ACCEPT_CONTENT_TYPE

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AGGREGATED_SIZE

static final String AGGREGATED_SIZE

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AGGREGATED_TIMEOUT

static final String AGGREGATED_TIMEOUT

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AGGREGATED_COMPLETED_BY

static final String AGGREGATED_COMPLETED_BY

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AGGREGATED_CORRELATION_KEY

static final String AGGREGATED_CORRELATION_KEY

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AGGREGATION_STRATEGY

static final String AGGREGATION_STRATEGY

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AGGREGATION_COMPLETE_ALL_GROUPS

static final String AGGREGATION_COMPLETE_ALL_GROUPS

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ASYNC_WAIT

static final String ASYNC_WAIT

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BATCH_INDEX

static final String BATCH_INDEX

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BATCH_SIZE

static final String BATCH_SIZE

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BATCH_COMPLETE

static final String BATCH_COMPLETE

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BEAN_METHOD_NAME

static final String BEAN_METHOD_NAME

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BEAN_MULTI_PARAMETER_ARRAY

static final String BEAN_MULTI_PARAMETER_ARRAY

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BINDING

static final String BINDING

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BREADCRUMB_ID

static final String BREADCRUMB_ID

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CHARSET_NAME

static final String CHARSET_NAME

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CREATED_TIMESTAMP

static final String CREATED_TIMESTAMP

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CONTENT_ENCODING

static final String CONTENT_ENCODING

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CONTENT_LENGTH

static final String CONTENT_LENGTH

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CONTENT_TYPE

static final String CONTENT_TYPE

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CORRELATION_ID

static final String CORRELATION_ID

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DATASET_INDEX

static final String DATASET_INDEX

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DEFAULT_CHARSET_PROPERTY

static final String DEFAULT_CHARSET_PROPERTY

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DESTINATION_OVERRIDE_URL

static final String DESTINATION_OVERRIDE_URL

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DISABLE_HTTP_STREAM_CACHE

static final String DISABLE_HTTP_STREAM_CACHE

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DUPLICATE_MESSAGE

static final String DUPLICATE_MESSAGE

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EXCEPTION_CAUGHT

static final String EXCEPTION_CAUGHT

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EVALUATE_EXPRESSION_RESULT

static final String EVALUATE_EXPRESSION_RESULT

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ERRORHANDLER_HANDLED

static final String ERRORHANDLER_HANDLED

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EXTERNAL_REDELIVERED

static final String EXTERNAL_REDELIVERED

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FAILURE_HANDLED

static final String FAILURE_HANDLED

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FAILURE_ENDPOINT

static final String FAILURE_ENDPOINT

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FILTER_NON_XML_CHARS

static final String FILTER_NON_XML_CHARS

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FILE_LOCAL_WORK_PATH

static final String FILE_LOCAL_WORK_PATH

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FILE_NAME

static final String FILE_NAME

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FILE_NAME_ONLY

static final String FILE_NAME_ONLY

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FILE_NAME_PRODUCED

static final String FILE_NAME_PRODUCED

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FILE_PATH

static final String FILE_PATH

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FILE_PARENT

static final String FILE_PARENT

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FILE_LAST_MODIFIED

static final String FILE_LAST_MODIFIED

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FILTER_MATCHED

static final String FILTER_MATCHED

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FILE_LOCK_FILE_ACQUIRED

static final String FILE_LOCK_FILE_ACQUIRED

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GROUPED_EXCHANGE

static final String GROUPED_EXCHANGE

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HTTP_BASE_URI

static final String HTTP_BASE_URI

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HTTP_CHARACTER_ENCODING

static final String HTTP_CHARACTER_ENCODING

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HTTP_METHOD

static final String HTTP_METHOD

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HTTP_PATH

static final String HTTP_PATH

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HTTP_PROTOCOL_VERSION

static final String HTTP_PROTOCOL_VERSION

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HTTP_QUERY

static final String HTTP_QUERY

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HTTP_RESPONSE_CODE

static final String HTTP_RESPONSE_CODE

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HTTP_URI

static final String HTTP_URI

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HTTP_URL

static final String HTTP_URL

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HTTP_CHUNKED

static final String HTTP_CHUNKED

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HTTP_SERVLET_REQUEST

static final String HTTP_SERVLET_REQUEST

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HTTP_SERVLET_RESPONSE

static final String HTTP_SERVLET_RESPONSE

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INTERCEPTED_ENDPOINT

static final String INTERCEPTED_ENDPOINT

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LANGUAGE_SCRIPT

static final String LANGUAGE_SCRIPT

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LOG_DEBUG_BODY_MAX_CHARS

static final String LOG_DEBUG_BODY_MAX_CHARS

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LOG_DEBUG_BODY_STREAMS

static final String LOG_DEBUG_BODY_STREAMS

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LOOP_INDEX

static final String LOOP_INDEX

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LOOP_SIZE

static final String LOOP_SIZE

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MAXIMUM_CACHE_POOL_SIZE

static final String MAXIMUM_CACHE_POOL_SIZE

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MAXIMUM_ENDPOINT_CACHE_SIZE

static final String MAXIMUM_ENDPOINT_CACHE_SIZE

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MULTICAST_INDEX

static final String MULTICAST_INDEX

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MULTICAST_COMPLETE

static final String MULTICAST_COMPLETE

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NOTIFY_EVENT

static final String NOTIFY_EVENT

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ON_COMPLETION

static final String ON_COMPLETION

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PARENT_UNIT_OF_WORK

static final String PARENT_UNIT_OF_WORK

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RECEIVED_TIMESTAMP

static final String RECEIVED_TIMESTAMP

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REDELIVERED

static final String REDELIVERED

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REDELIVERY_COUNTER

static final String REDELIVERY_COUNTER

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REDELIVERY_MAX_COUNTER

static final String REDELIVERY_MAX_COUNTER

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REDELIVERY_EXHAUSTED

static final String REDELIVERY_EXHAUSTED

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REDELIVERY_DELAY

static final String REDELIVERY_DELAY

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ROLLBACK_ONLY

static final String ROLLBACK_ONLY

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ROLLBACK_ONLY_LAST

static final String ROLLBACK_ONLY_LAST

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ROUTE_STOP

static final String ROUTE_STOP

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SOAP_ACTION

static final String SOAP_ACTION

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SKIP_GZIP_ENCODING

static final String SKIP_GZIP_ENCODING

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SLIP_ENDPOINT

static final String SLIP_ENDPOINT

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SPLIT_INDEX

static final String SPLIT_INDEX

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SPLIT_COMPLETE

static final String SPLIT_COMPLETE

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SPLIT_SIZE

static final String SPLIT_SIZE

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TIMER_COUNTER

static final String TIMER_COUNTER

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TIMER_FIRED_TIME

static final String TIMER_FIRED_TIME

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TIMER_NAME

static final String TIMER_NAME

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TIMER_PERIOD

static final String TIMER_PERIOD

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TIMER_TIME

static final String TIMER_TIME

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TO_ENDPOINT

static final String TO_ENDPOINT

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TRACE_EVENT

static final String TRACE_EVENT

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TRACE_EVENT_NODE_ID

static final String TRACE_EVENT_NODE_ID

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TRACE_EVENT_TIMESTAMP

static final String TRACE_EVENT_TIMESTAMP

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TRACE_EVENT_EXCHANGE

static final String TRACE_EVENT_EXCHANGE

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TRANSFER_ENCODING

static final String TRANSFER_ENCODING

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UNIT_OF_WORK_EXHAUSTED

static final String UNIT_OF_WORK_EXHAUSTED

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UNIT_OF_WORK_PROCESS_SYNC

static final String UNIT_OF_WORK_PROCESS_SYNC

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XSLT_FILE_NAME

static final String XSLT_FILE_NAME

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Method Detail

getPattern

ExchangePattern getPattern()

Returns the ExchangePattern (MEP) of this exchange.

Returns:

the message exchange pattern of this exchange

setPattern

void setPattern(ExchangePattern pattern)

Allows the ExchangePattern (MEP) of this exchange to be customized. This typically won't be required as an exchange can be created with a specific MEP by calling Endpoint.createExchange(ExchangePattern) but it is here just in case it is needed.

Parameters:

pattern - the pattern

getProperty

Object getProperty(String name)

Returns a property associated with this exchange by name

Parameters:

name - the name of the property

Returns:

the value of the given property or null if there is no property for the given name

getProperty

Object getProperty(String name,
                   Object defaultValue)

Returns a property associated with this exchange by name

Parameters:

name - the name of the property

defaultValue - the default value to return if property was absent

Returns:

the value of the given property or defaultValue if there is no property for the given name

getProperty

<T> T getProperty(String name,
                  Class<T> type)

Returns a property associated with this exchange by name and specifying the type required

Parameters:

name - the name of the property

type - the type of the property

Returns:

the value of the given property or null if there is no property for the given name or null if it cannot be converted to the given type

getProperty

<T> T getProperty(String name,
                  Object defaultValue,
                  Class<T> type)

Returns a property associated with this exchange by name and specifying the type required

Parameters:

name - the name of the property

defaultValue - the default value to return if property was absent

type - the type of the property

Returns:

the value of the given property or defaultValue if there is no property for the given name or null if it cannot be converted to the given type

setProperty

void setProperty(String name,
                 Object value)

Sets a property on the exchange

Parameters:

name - of the property

value - to associate with the name

removeProperty

Object removeProperty(String name)

Removes the given property on the exchange

Parameters:

name - of the property

Returns:

the old value of the property

getProperties

Map<String,Object> getProperties()

Returns all of the properties associated with the exchange

Returns:

all the headers in a Map

hasProperties

boolean hasProperties()

Returns whether any properties has been set

Returns:

true if any properties has been set

getIn

Message getIn()

Returns the inbound request message

Returns:

the message

getIn

<T> T getIn(Class<T> type)

Returns the inbound request message as the given type

Parameters:

type - the given type

Returns:

the message as the given type or null if not possible to covert to given type

setIn

void setIn(Message in)

Sets the inbound message instance

Parameters:

in - the inbound message

getOut

Message getOut()

Returns the outbound message, lazily creating one if one has not already been associated with this exchange.

Important: If you want to change the current message, then use getIn() instead as it will ensure headers etc. is kept and propagated when routing continues. Bottom line end users should rarely use this method.

If you want to test whether an OUT message have been set or not, use the hasOut() method.

See also the class java doc for this Exchange for more details and this FAQ entry.

Returns:

the response

See Also:

getIn()

getOut

<T> T getOut(Class<T> type)

Returns the outbound request message as the given type

Important: If you want to change the current message, then use getIn() instead as it will ensure headers etc. is kept and propagated when routing continues. Bottom line end users should rarely use this method.

If you want to test whether an OUT message have been set or not, use the hasOut() method.

See also the class java doc for this Exchange for more details and this FAQ entry.

Parameters:

type - the given type

Returns:

the message as the given type or null if not possible to covert to given type

See Also:

getIn(Class)

hasOut

boolean hasOut()

Returns whether an OUT message has been set or not.

Returns:

true if an OUT message exists, false otherwise.

setOut

void setOut(Message out)

Sets the outbound message

Parameters:

out - the outbound message

getException

Exception getException()

Returns the exception associated with this exchange

Returns:

the exception (or null if no faults)

getException

<T> T getException(Class<T> type)

Returns the exception associated with this exchange.

Is used to get the caused exception that typically have been wrapped in some sort of Camel wrapper exception

The strategy is to look in the exception hierarchy to find the first given cause that matches the type. Will start from the bottom (the real cause) and walk upwards.

Parameters:

type - the exception type

Returns:

the exception (or null if no caused exception matched)

setException

void setException(Throwable t)

Sets the exception associated with this exchange

Camel will wrap Throwable into Exception type to accommodate for the getException() method returning a plain Exception type.

Parameters:

t - the caused exception

isFailed

boolean isFailed()

Returns true if this exchange failed due to either an exception or fault

Returns:

true if this exchange failed due to either an exception or fault

See Also:

getException(), Message.setFault(boolean), Message.isFault()

isTransacted

boolean isTransacted()

Returns true if this exchange is transacted

isExternalRedelivered

Boolean isExternalRedelivered()

Returns true if this exchange is an external initiated redelivered message (such as a JMS broker).

Important: It is not always possible to determine if the message is a redelivery or not, and therefore null is returned. Such an example would be a JDBC message. However JMS brokers provides details if a message is redelivered.

Returns:

true if redelivered, false if not, null if not able to determine

isRollbackOnly

boolean isRollbackOnly()

Returns true if this exchange is marked for rollback

getContext

CamelContext getContext()

Returns the container so that a processor can resolve endpoints from URIs

Returns:

the container which owns this exchange

copy

Exchange copy()

Creates a copy of the current message exchange so that it can be forwarded to another destination

getFromEndpoint

Endpoint getFromEndpoint()

Returns the endpoint which originated this message exchange if a consumer on an endpoint created the message exchange, otherwise this property will be null

setFromEndpoint

void setFromEndpoint(Endpoint fromEndpoint)

Sets the endpoint which originated this message exchange. This method should typically only be called by Endpoint implementations

Parameters:

fromEndpoint - the endpoint which is originating this message exchange

getFromRouteId

String getFromRouteId()

Returns the route id which originated this message exchange if a route consumer on an endpoint created the message exchange, otherwise this property will be null

setFromRouteId

void setFromRouteId(String fromRouteId)

Sets the route id which originated this message exchange. This method should typically only be called by the internal framework.

Parameters:

fromRouteId - the from route id

getUnitOfWork

UnitOfWork getUnitOfWork()

Returns the unit of work that this exchange belongs to; which may map to zero, one or more physical transactions

setUnitOfWork

void setUnitOfWork(UnitOfWork unitOfWork)

Sets the unit of work that this exchange belongs to; which may map to zero, one or more physical transactions

getExchangeId

String getExchangeId()

Returns the exchange id (unique)

setExchangeId

void setExchangeId(String id)

Set the exchange id

addOnCompletion

void addOnCompletion(Synchronization onCompletion)

Adds a Synchronization to be invoked as callback when this exchange is completed.

Parameters:

onCompletion - the callback to invoke on completion of this exchange

handoverCompletions

void handoverCompletions(Exchange target)

Handover all the on completions from this exchange to the target exchange.

Parameters:

target - the target exchange

handoverCompletions

List<Synchronization> handoverCompletions()

Handover all the on completions from this exchange

Returns:

the on completions