com.bloomberglp.blpapi

Class Message

java.lang.Object

com.bloomberglp.blpapi.Message

public abstract class Message
extends Object

Message objects are used to represent all outputs from the API

Message objects are used to represent all outputs from the API including subscription data, response, administrative and status messages. Message objects are obtained from a MessageIterator. A message always has a message type and may optionally contain the following

     * topicName     - valid for Subscription data messages
     * service       - The service from which this message was received from
     * correlationId - one or more correlationIds if this message was
                       delivered for a pending request or a subscription
 

A Message object is a handle to a single underlying protocol message. The Message contents are represented as an Element and some convenient shortcuts are supplied to the Element accessors.

Author:

ssomu

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Message.Fragment A message could be split into more than one fragments to reduce each message size.
static class	Message.Recap Some subscription data messages (messages which originate from events with event type Event.EventType.SUBSCRIPTION_DATA) are recaps, which summarize the overall state of the data associated with a subscription.

Method Summary

Modifier and Type	Method and Description
abstract Element	asElement() Returns the contents of this Message as a read-only Element.
abstract CorrelationID	correlationID() Return the correlationId associated with this message.
abstract CorrelationID	correlationID(int index) Return the correlationId associated with this message at the specified index
abstract CorrelationID	correlationIDAt(int index) Deprecated. As of 3.2.1, use correlationID(int)
abstract Message.Fragment	fragmentType() Return the fragment type.
abstract Element	getElement(Name name) Return the element of this message having the specified name.
abstract Element	getElement(String name) Return the element of this message having the specified name.
abstract boolean	getElementAsBool(Name name) Return the value of the element having specified name as a boolean value
abstract boolean	getElementAsBool(String name) Return the value of the element having specified name as a boolean value
abstract byte[]	getElementAsBytes(Name name) Return the value of the element having specified name as a byte array
abstract byte[]	getElementAsBytes(String name) Return the value of the element having specified name as a byte array
abstract char	getElementAsChar(Name name) Return the value of the element having specified name as a char value
abstract char	getElementAsChar(String name) Return the value of the element having specified name as a char value
abstract Datetime	getElementAsDate(Name name) Return the value of the element having specified name as a Date value
abstract Datetime	getElementAsDate(String name) Return the value of the element having specified name as a Date value
abstract Datetime	getElementAsDatetime(Name name) Return the value of the element having specified name as a Datetime value
abstract Datetime	getElementAsDatetime(String name) Return the value of the element having specified name as a Datetime value
abstract float	getElementAsFloat32(Name name) Return the value of the element having specified name as a float value
abstract float	getElementAsFloat32(String name) Return the value of the element having specified name as a float value
abstract double	getElementAsFloat64(Name name) Return the value of the element having specified name as a double value
abstract double	getElementAsFloat64(String name) Return the value of the element having specified name as a double value
abstract int	getElementAsInt32(Name name) Return the value of the element having specified name as a int value
abstract int	getElementAsInt32(String name) Return the value of the element having specified name as a int value
abstract long	getElementAsInt64(Name name) Return the value of the element having specified name as a long value
abstract long	getElementAsInt64(String name) Return the value of the element having specified name as a long value
abstract Name	getElementAsName(Name name) Return the value of the element having specified name as a Constant value
abstract Name	getElementAsName(String name) Return the value of the element having specified name as a Constant value
abstract String	getElementAsString(Name name) Return the value of the element having specified name as a String value
abstract String	getElementAsString(String name) Return the value of the element having specified name as a String value
abstract Datetime	getElementAsTime(Name name) Return the value of the element having specified name as a Time value
abstract Datetime	getElementAsTime(String name) Return the value of the element having specified name as a Time value
abstract boolean	hasElement(Name name) Return true if this message has the element having the specified name false otherwise
abstract boolean	hasElement(Name name, boolean excludeNullElements) Return true if this message has the element having the specified name false otherwise
abstract boolean	hasElement(String name) Return true if this message has the element having the specified name false otherwise
abstract boolean	hasElement(String name, boolean excludeNullElements) Return true if this message has the element having the specified name false otherwise
abstract boolean	isValid()
abstract Name	messageType() Return the Name constant representing the type of the message
abstract int	numCorrelationIds() Return the number of correlation ids associated with this message.
abstract int	numElements() Return the number of elements contained by this message
abstract void	print(OutputStream output) Prints the contents of this message to OutputStream.
abstract void	print(Writer writer) Prints the contents of this message to Writer.
abstract Message.Recap	recapType() Return the recap type.
abstract Service	service() Return the Service associated with this message.
abstract long	timeReceivedMillis() Return the time when the message was received by the SDK and '0' if there is no timestamp associated with this Message.
abstract String	topicName() Return the topic string associated with this message.
abstract String	toString() Returns the contents of this message as a String

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

topicName

public abstract String topicName()

Return the topic string associated with this message. Return an empty string if there is no topic associated with this message

service

public abstract Service service()

Return the Service associated with this message. Return null if this method is not associated with a service

messageType

public abstract Name messageType()

Return the Name constant representing the type of the message

fragmentType

public abstract Message.Fragment fragmentType()

Return the fragment type. The return value is a value of enum Fragment to indicate whether it is a fragmented message of a big message and its positions in fragmentation if it is.

recapType

public abstract Message.Recap recapType()

Return the recap type. The return value is a value of Message.Recap to indicate whether this message is a solicited recap, an unsolicited recap, or neither.

Returns:

The recap type associated with this message

correlationID

public abstract CorrelationID correlationID()

Return the correlationId associated with this message.

This is same as calling correlationID(0). If there is more than one correlationId associated with this message return the first correlationId. If there are no correlationIds available for this message return null

Returns:

correlationId associated with this message if available null otherwise

correlationIDAt

public abstract CorrelationID correlationIDAt(int index)

Deprecated. As of 3.2.1, use correlationID(int)

correlationID

public abstract CorrelationID correlationID(int index)

Return the correlationId associated with this message at the specified index

Normally each message is associated with only one correlationId. See "allowMultipeCorrelatorsPerMsg" option in SessionOptions for more information on when multiple correlators can be returned per message

Throws:

IndexOutOfBoundsException - if index >= numCorrelationIds()

numCorrelationIds

public abstract int numCorrelationIds()

Return the number of correlation ids associated with this message.

Note: A Message will have exactly one CorrelationId unless "allowMultipleCorrelatorsPerMsg" option was enabled for the Session this Message came from. When allowMultipleCorrelatorsPerMsg is disabled (the default) and more than one active subscription would result in the same Message the Message is delivered multiple times (without making a physical copy). Each Message is accompanied by a single CorrelationId. When "allowMultipleCorrelatorsPerMsg" is enabled and more than one active subscription would result in the same Message the Message is delivered once with a list of corresponding CorrelationId values.

See Also:

SessionOptions

timeReceivedMillis

public abstract long timeReceivedMillis()

Return the time when the message was received by the SDK and '0' if there is no timestamp associated with this Message. System.currentTimeMillis() is used to get the current time. Note that by default the subscription data messages are not timestamped (but all the other messages are). To enable recording receive time for all messages set SessionOptions.setRecordSubscriptionDataReceiveTimes(boolean).

asElement

public abstract Element asElement()

Returns the contents of this Message as a read-only Element.

numElements

public abstract int numElements()

Return the number of elements contained by this message

Same as calling asElement().Element.numElements()

isValid

public abstract boolean isValid()

hasElement

public abstract boolean hasElement(Name name)

Return true if this message has the element having the specified name false otherwise

Same as calling asElement().Element.hasElement(Name)

hasElement

public abstract boolean hasElement(Name name,
                                   boolean excludeNullElements)

Return true if this message has the element having the specified name false otherwise

Same as calling asElement().Element.hasElement(Name, boolean)

hasElement

public abstract boolean hasElement(String name)

Return true if this message has the element having the specified name false otherwise

Same as calling asElement().Element.hasElement(String)

hasElement

public abstract boolean hasElement(String name,
                                   boolean excludeNullElements)

Return true if this message has the element having the specified name false otherwise

Same as calling asElement().Element.hasElement(String, boolean)

getElement

public abstract Element getElement(Name name)

Return the element of this message having the specified name.

Same as calling asElement().Element.getElement(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

getElement

public abstract Element getElement(String name)

Return the element of this message having the specified name.

Same as calling asElement().Element.getElement(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

getElementAsBool

public abstract boolean getElementAsBool(Name name)

Return the value of the element having specified name as a boolean value

Same as calling asElement().Element.getElementAsBool(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a boolean value

getElementAsBool

public abstract boolean getElementAsBool(String name)

Return the value of the element having specified name as a boolean value

Same as calling asElement().Element.getElementAsBool(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a boolean value

getElementAsBytes

public abstract byte[] getElementAsBytes(Name name)

Return the value of the element having specified name as a byte array

Same as calling asElement().Element.getElementAsBytes(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a byte array

getElementAsBytes

public abstract byte[] getElementAsBytes(String name)

Return the value of the element having specified name as a byte array

Same as calling asElement().Element.getElementAsBytes(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a byte array

getElementAsChar

public abstract char getElementAsChar(Name name)

Return the value of the element having specified name as a char value

Same as calling asElement().Element.getElementAsChar(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a char value

getElementAsChar

public abstract char getElementAsChar(String name)

Return the value of the element having specified name as a char value

Same as calling asElement().Element.getElementAsChar(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a char value

getElementAsInt32

public abstract int getElementAsInt32(Name name)

Return the value of the element having specified name as a int value

Same as calling asElement().Element.getElementAsInt32(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a int value

getElementAsInt32

public abstract int getElementAsInt32(String name)

Return the value of the element having specified name as a int value

Same as calling asElement().Element.getElementAsInt32(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a int value

getElementAsInt64

public abstract long getElementAsInt64(Name name)

Return the value of the element having specified name as a long value

Same as calling asElement().Element.getElementAsInt64(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a long value

getElementAsInt64

public abstract long getElementAsInt64(String name)

Return the value of the element having specified name as a long value

Same as calling asElement().Element.getElementAsInt64(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a long value

getElementAsFloat64

public abstract double getElementAsFloat64(Name name)

Return the value of the element having specified name as a double value

Same as calling asElement().Element.getElementAsFloat64(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a double value

getElementAsFloat64

public abstract double getElementAsFloat64(String name)

Return the value of the element having specified name as a double value

Same as calling asElement().Element.getElementAsFloat64(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a double value

getElementAsFloat32

public abstract float getElementAsFloat32(Name name)

Return the value of the element having specified name as a float value

Same as calling asElement().Element.getElementAsFloat32(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a float value

getElementAsFloat32

public abstract float getElementAsFloat32(String name)

Return the value of the element having specified name as a float value

Same as calling asElement().Element.getElementAsFloat32(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a float value

getElementAsString

public abstract String getElementAsString(Name name)

Return the value of the element having specified name as a String value

Same as calling asElement().Element.getElementAsString(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a String value

getElementAsString

public abstract String getElementAsString(String name)

Return the value of the element having specified name as a String value

Same as calling asElement().Element.getElementAsString(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a String value

getElementAsDatetime

public abstract Datetime getElementAsDatetime(Name name)

Return the value of the element having specified name as a Datetime value

Same as calling asElement().Element.getElementAsDatetime(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Datetime value

getElementAsDatetime

public abstract Datetime getElementAsDatetime(String name)

Return the value of the element having specified name as a Datetime value

Same as calling asElement().Element.getElementAsDatetime(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Datetime value

getElementAsDate

public abstract Datetime getElementAsDate(Name name)

Return the value of the element having specified name as a Date value

Same as calling asElement().Element.getElementAsDate(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Date value

getElementAsDate

public abstract Datetime getElementAsDate(String name)

Return the value of the element having specified name as a Date value

Same as calling asElement().Element.getElementAsDate(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Date value

getElementAsTime

public abstract Datetime getElementAsTime(Name name)

Return the value of the element having specified name as a Time value

Same as calling asElement().Element.getElementAsTime(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Time value

getElementAsTime

public abstract Datetime getElementAsTime(String name)

Return the value of the element having specified name as a Time value

Same as calling asElement().Element.getElementAsTime(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Time value

getElementAsName

public abstract Name getElementAsName(Name name)

Return the value of the element having specified name as a Constant value

Same as calling asElement().Element.getElementAsName(Name)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Time value

getElementAsName

public abstract Name getElementAsName(String name)

Return the value of the element having specified name as a Constant value

Same as calling asElement().Element.getElementAsName(String)

Throws:

NotFoundException - if this message does not contain an element having the specified name

InvalidConversionException - if the value is not convertible to a Time value

toString

public abstract String toString()

Returns the contents of this message as a String

Overrides:

toString in class Object

print

public abstract void print(OutputStream output)
                    throws IOException

Prints the contents of this message to OutputStream.

Throws:

IOException

print

public abstract void print(Writer writer)
                    throws IOException

Prints the contents of this message to Writer.

Throws:

IOException