JMS API 2.0.1 · javax.jms.StreamMessage

A StreamMessage object is used to send a stream of primitive types in the Java programming language. It is filled and read sequentially. It inherits from the Message interface and adds a stream message body. Its methods are based largely on those found in java.io.DataInputStream and java.io.DataOutputStream.

The primitive types can be read or written explicitly using methods for each type. They may also be read or written generically as objects. For instance, a call to StreamMessage.writeInt(6) is equivalent to StreamMessage.writeObject(new Integer(6)). Both forms are provided, because the explicit form is convenient for static programming, and the object form is needed when types are not known at compile time.

When the message is first created, and when clearBody is called, the body of the message is in write-only mode. After the first call to reset has been made, the message body is in read-only mode. After a message has been sent, the client that sent it can retain and modify it without affecting the message that has been sent. The same message object can be sent multiple times. When a message has been received, the provider has called reset so that the message body is in read-only mode for the client.

If clearBody is called on a message in read-only mode, the message body is cleared and the message body is in write-only mode.

If a client attempts to read a message in write-only mode, a MessageNotReadableException is thrown.

If a client attempts to write a message in read-only mode, a MessageNotWriteableException is thrown.

StreamMessage objects support the following conversion table. The marked cases must be supported. The unmarked cases must throw a JMSException. The String-to-primitive conversions may throw a runtime exception if the primitive's valueOf() method does not accept it as a valid String representation of the primitive.

A value written as the row type can be read as the column type.

|        | boolean byte short char int long float double String byte[]
|----------------------------------------------------------------------
|boolean |    X                                            X
|byte    |          X     X         X   X                  X   
|short   |                X         X   X                  X   
|char    |                     X                           X
|int     |                          X   X                  X   
|long    |                              X                  X   
|float   |                                    X     X      X   
|double  |                                          X      X   
|String  |    X     X     X         X   X     X     X      X   
|byte[]  |                                                        X
|----------------------------------------------------------------------

Attempting to read a null value as a primitive type must be treated as calling the primitive's corresponding valueOf(String) conversion method with a null value. Since char does not support a String conversion, attempting to read a null value as a char must throw a NullPointerException.

Field Summary

Inherited from javax.jms.Message:: DEFAULT_DELIVERY_DELAY DEFAULT_DELIVERY_MODE DEFAULT_PRIORITY DEFAULT_TIME_TO_LIVE

Method Summary

Modifier and Type	Method and Description
public boolean	Returns: the `boolean` value read readBoolean() Reads a `boolean` from the stream message.
public byte	Returns: the next byte from the stream message as a 8-bit `byte` readByte() Reads a `byte` value from the stream message.
public int	Returns: the total number of bytes read into the buffer, or -1 if there is no more data because the end of the byte field has been reached readBytes(byte[] the buffer into which the data is read value) Reads a byte array field from the stream message into the specified `byte[]` object (the read buffer).
public char	Returns: a Unicode character from the stream message readChar() Reads a Unicode character value from the stream message.
public double	Returns: a `double` value from the stream message readDouble() Reads a `double` from the stream message.
public float	Returns: a `float` value from the stream message readFloat() Reads a `float` from the stream message.
public int	Returns: a 32-bit integer value from the stream message, interpreted as an `int` readInt() Reads a 32-bit integer from the stream message.
public long	Returns: a 64-bit integer value from the stream message, interpreted as a `long` readLong() Reads a 64-bit integer from the stream message.
public Object	Returns: a Java object from the stream message, in objectified format (for example, if the object was written as an `int`, an `Integer` is returned) readObject() Reads an object from the stream message.
public short	Returns: a 16-bit integer from the stream message readShort() Reads a 16-bit integer from the stream message.
public String	Returns: a Unicode string from the stream message readString() Reads a `String` from the stream message.
public void	reset() Puts the message body in read-only mode and repositions the stream to the beginning.
public void	writeBoolean(boolean the `boolean` value to be written value) Writes a `boolean` to the stream message.
public void	writeByte(byte the `byte` value to be written value) Writes a `byte` to the stream message.
public void	writeBytes(byte[] the byte array value to be written value) Writes a byte array field to the stream message.
public void	writeBytes(byte[] the byte array value to be written value, int the initial offset within the byte array offset, int the number of bytes to use length) Writes a portion of a byte array as a byte array field to the stream message.
public void	writeChar(char the `char` value to be written value) Writes a `char` to the stream message.
public void	writeDouble(double the `double` value to be written value) Writes a `double` to the stream message.
public void	writeFloat(float the `float` value to be written value) Writes a `float` to the stream message.
public void	writeInt(int the `int` value to be written value) Writes an `int` to the stream message.
public void	writeLong(long the `long` value to be written value) Writes a `long` to the stream message.
public void	writeObject(Object the Java object to be written value) Writes an object to the stream message.
public void	writeShort(short the `short` value to be written value) Writes a `short` to the stream message.
public void	writeString(String the `String` value to be written value) Writes a `String` to the stream message.

Method Detail

readBoolean back to summary

readBoolean	back to summary
public boolean readBoolean() throws JMSException Reads a `boolean` from the stream message. Returns:boolean the `boolean` value read Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

public boolean readBoolean() throws JMSException

Reads a boolean from the stream message.

Returns:boolean

the boolean value read

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

readByte back to summary

readByte	back to summary
public byte readByte() throws JMSException Reads a `byte` value from the stream message. Returns:byte the next byte from the stream message as a 8-bit `byte` Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

public byte readByte() throws JMSException

Reads a byte value from the stream message.

Returns:byte

the next byte from the stream message as a 8-bit byte

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

readBytes back to summary

readBytes	back to summary
public int readBytes(byte[] value) throws JMSException Reads a byte array field from the stream message into the specified `byte[]` object (the read buffer). To read the field value, `readBytes` should be successively called until it returns a value less than the length of the read buffer. The value of the bytes in the buffer following the last byte read is undefined. If `readBytes` returns a value equal to the length of the buffer, a subsequent `readBytes` call must be made. If there are no more bytes to be read, this call returns -1. If the byte array field value is null, `readBytes` returns -1. If the byte array field value is empty, `readBytes` returns 0. Once the first `readBytes` call on a `byte[]` field value has been made, the full value of the field must be read before it is valid to read the next field. An attempt to read the next field before that has been done will throw a `MessageFormatException`. To read the byte field value into a new `byte[]` object, use the `readObject` method. Parameters value:byte[] the buffer into which the data is read Returns:int the total number of bytes read into the buffer, or -1 if there is no more data because the end of the byte field has been reached Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode. See Also `readObject()`

public int readBytes(byte[] value) throws JMSException

Reads a byte array field from the stream message into the specified byte[] object (the read buffer).

To read the field value, readBytes should be successively called until it returns a value less than the length of the read buffer. The value of the bytes in the buffer following the last byte read is undefined.

If readBytes returns a value equal to the length of the buffer, a subsequent readBytes call must be made. If there are no more bytes to be read, this call returns -1.

If the byte array field value is null, readBytes returns -1.

If the byte array field value is empty, readBytes returns 0.

Once the first readBytes call on a byte[] field value has been made, the full value of the field must be read before it is valid to read the next field. An attempt to read the next field before that has been done will throw a MessageFormatException.

To read the byte field value into a new byte[] object, use the readObject method.

Parameters

value:byte[]: the buffer into which the data is read

Returns:int

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the byte field has been reached

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

See Also

readObject()

readChar	back to summary
public char readChar() throws JMSException Reads a Unicode character value from the stream message. Returns:char a Unicode character from the stream message Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid MessageNotReadableException: if the message is in write-only mode.

readChar

back to summary

public char readChar() throws JMSException

Reads a Unicode character value from the stream message.

Returns:char

a Unicode character from the stream message

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid
MessageNotReadableException:: if the message is in write-only mode.

readDouble back to summary

readDouble	back to summary
public double readDouble() throws JMSException Reads a `double` from the stream message. Returns:double a `double` value from the stream message Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

public double readDouble() throws JMSException

Reads a double from the stream message.

Returns:double

a double value from the stream message

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

readFloat back to summary

readFloat	back to summary
public float readFloat() throws JMSException Reads a `float` from the stream message. Returns:float a `float` value from the stream message Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

public float readFloat() throws JMSException

Reads a float from the stream message.

Returns:float

a float value from the stream message

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

readInt back to summary

readInt	back to summary
public int readInt() throws JMSException Reads a 32-bit integer from the stream message. Returns:int a 32-bit integer value from the stream message, interpreted as an `int` Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

public int readInt() throws JMSException

Reads a 32-bit integer from the stream message.

Returns:int

a 32-bit integer value from the stream message, interpreted as an int

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

readLong back to summary

readLong	back to summary
public long readLong() throws JMSException Reads a 64-bit integer from the stream message. Returns:long a 64-bit integer value from the stream message, interpreted as a `long` Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

public long readLong() throws JMSException

Reads a 64-bit integer from the stream message.

Returns:long

a 64-bit integer value from the stream message, interpreted as a long

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

readObject back to summary

readObject	back to summary
public Object readObject() throws JMSException Reads an object from the stream message. This method can be used to return, in objectified format, an object in the Java programming language ("Java object") that has been written to the stream with the equivalent `writeObject` method call, or its equivalent primitive `writetype` method. Note that byte values are returned as `byte[]`, not `Byte[]`. An attempt to call `readObject` to read a byte field value into a new `byte[]` object before the full value of the byte field has been read will throw a `MessageFormatException`. Returns:Object a Java object from the stream message, in objectified format (for example, if the object was written as an `int`, an `Integer` is returned) Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode. See Also `readBytes(byte[] value)`

public Object readObject() throws JMSException

Reads an object from the stream message.

This method can be used to return, in objectified format, an object in the Java programming language ("Java object") that has been written to the stream with the equivalent writeObject method call, or its equivalent primitive writetype method.

Note that byte values are returned as byte[], not Byte[].

An attempt to call readObject to read a byte field value into a new byte[] object before the full value of the byte field has been read will throw a MessageFormatException.

Returns:Object

a Java object from the stream message, in objectified format (for example, if the object was written as an int, an Integer is returned)

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

See Also

readBytes(byte[] value)

readShort	back to summary
public short readShort() throws JMSException Reads a 16-bit integer from the stream message. Returns:short a 16-bit integer from the stream message Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

readShort

back to summary

public short readShort() throws JMSException

Reads a 16-bit integer from the stream message.

Returns:short

a 16-bit integer from the stream message

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

readString back to summary

readString	back to summary
public String readString() throws JMSException Reads a `String` from the stream message. Returns:String a Unicode string from the stream message Exceptions JMSException: if the JMS provider fails to read the message due to some internal error. MessageEOFException: if unexpected end of message stream has been reached. MessageFormatException: if this type conversion is invalid. MessageNotReadableException: if the message is in write-only mode.

public String readString() throws JMSException

Reads a String from the stream message.

Returns:String

a Unicode string from the stream message

Exceptions

JMSException:: if the JMS provider fails to read the message due to some internal error.
MessageEOFException:: if unexpected end of message stream has been reached.
MessageFormatException:: if this type conversion is invalid.
MessageNotReadableException:: if the message is in write-only mode.

reset	back to summary
public void reset() throws JMSException Puts the message body in read-only mode and repositions the stream to the beginning. Exceptions JMSException: if the JMS provider fails to reset the message due to some internal error. MessageFormatException: if the message has an invalid format.

reset

back to summary

public void reset() throws JMSException

Puts the message body in read-only mode and repositions the stream to the beginning.

Exceptions

JMSException:: if the JMS provider fails to reset the message due to some internal error.
MessageFormatException:: if the message has an invalid format.

writeBoolean back to summary

writeBoolean	back to summary
public void writeBoolean(boolean value) throws JMSException Writes a `boolean` to the stream message. The value `true` is written as the value `(byte)1`; the value `false` is written as the value `(byte)0`. Parameters value:boolean the `boolean` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeBoolean(boolean value) throws JMSException

Writes a boolean to the stream message. The value true is written as the value (byte)1; the value false is written as the value (byte)0.

Parameters

value:boolean: the boolean value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeByte back to summary

writeByte	back to summary
public void writeByte(byte value) throws JMSException Writes a `byte` to the stream message. Parameters value:byte the `byte` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeByte(byte value) throws JMSException

Writes a byte to the stream message.

Parameters

value:byte: the byte value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeBytes back to summary

writeBytes	back to summary
public void writeBytes(byte[] value) throws JMSException Writes a byte array field to the stream message. The byte array `value` is written to the message as a byte array field. Consecutively written byte array fields are treated as two distinct fields when the fields are read. Parameters value:byte[] the byte array value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeBytes(byte[] value) throws JMSException

Writes a byte array field to the stream message.

The byte array value is written to the message as a byte array field. Consecutively written byte array fields are treated as two distinct fields when the fields are read.

Parameters

value:byte[]: the byte array value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeBytes back to summary

writeBytes	back to summary
public void writeBytes(byte[] value, int offset, int length) throws JMSException Writes a portion of a byte array as a byte array field to the stream message. The a portion of the byte array `value` is written to the message as a byte array field. Consecutively written byte array fields are treated as two distinct fields when the fields are read. Parameters value:byte[] the byte array value to be written offset:int the initial offset within the byte array length:int the number of bytes to use Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeBytes(byte[] value, int offset, int length) throws JMSException

Writes a portion of a byte array as a byte array field to the stream message.

The a portion of the byte array value is written to the message as a byte array field. Consecutively written byte array fields are treated as two distinct fields when the fields are read.

Parameters

value:byte[]: the byte array value to be written
offset:int: the initial offset within the byte array
length:int: the number of bytes to use

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeChar back to summary

writeChar	back to summary
public void writeChar(char value) throws JMSException Writes a `char` to the stream message. Parameters value:char the `char` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeChar(char value) throws JMSException

Writes a char to the stream message.

Parameters

value:char: the char value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeDouble back to summary

writeDouble	back to summary
public void writeDouble(double value) throws JMSException Writes a `double` to the stream message. Parameters value:double the `double` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeDouble(double value) throws JMSException

Writes a double to the stream message.

Parameters

value:double: the double value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeFloat back to summary

writeFloat	back to summary
public void writeFloat(float value) throws JMSException Writes a `float` to the stream message. Parameters value:float the `float` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeFloat(float value) throws JMSException

Writes a float to the stream message.

Parameters

value:float: the float value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeInt back to summary

writeInt	back to summary
public void writeInt(int value) throws JMSException Writes an `int` to the stream message. Parameters value:int the `int` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeInt(int value) throws JMSException

Writes an int to the stream message.

Parameters

value:int: the int value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeLong back to summary

writeLong	back to summary
public void writeLong(long value) throws JMSException Writes a `long` to the stream message. Parameters value:long the `long` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeLong(long value) throws JMSException

Writes a long to the stream message.

Parameters

value:long: the long value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeObject back to summary

writeObject	back to summary
public void writeObject(Object value) throws JMSException Writes an object to the stream message. This method works only for the objectified primitive object types (`Integer`, `Double`, `Long` ...), `String` objects, and byte arrays. Parameters value:Object the Java object to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageFormatException: if the object is invalid. MessageNotWriteableException: if the message is in read-only mode.

public void writeObject(Object value) throws JMSException

Writes an object to the stream message.

This method works only for the objectified primitive object types (Integer, Double, Long ...), String objects, and byte arrays.

Parameters

value:Object: the Java object to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageFormatException:: if the object is invalid.
MessageNotWriteableException:: if the message is in read-only mode.

writeShort back to summary

writeShort	back to summary
public void writeShort(short value) throws JMSException Writes a `short` to the stream message. Parameters value:short the `short` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeShort(short value) throws JMSException

Writes a short to the stream message.

Parameters

value:short: the short value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

writeString back to summary

writeString	back to summary
public void writeString(String value) throws JMSException Writes a `String` to the stream message. Parameters value:String the `String` value to be written Exceptions JMSException: if the JMS provider fails to write the message due to some internal error. MessageNotWriteableException: if the message is in read-only mode.

public void writeString(String value) throws JMSException

Writes a String to the stream message.

Parameters

value:String: the String value to be written

Exceptions

JMSException:: if the JMS provider fails to write the message due to some internal error.
MessageNotWriteableException:: if the message is in read-only mode.

public Interface StreamMessage

Field Summary

Method Summary

Method Detail