javax.jms.StreamMessage Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2017 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package javax.jms;
/**
* A {@code 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 {@code Message} interface and adds a stream message body. Its
* methods are based largely on those found in {@code java.io.DataInputStream} and {@code 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 {@code StreamMessage.writeInt(6)} is equivalent to
* {@code 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 {@code clearBody} is called, the body of the message is in write-only
* mode. After the first call to {@code 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
* {@code reset} so that the message body is in read-only mode for the client.
*
*
* If {@code 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 {@code MessageNotReadableException} is thrown.
*
*
* If a client attempts to write a message in read-only mode, a {@code MessageNotWriteableException} is thrown.
*
*
* {@code StreamMessage} objects support the following conversion table. The marked cases must be supported. The
* unmarked cases must throw a {@code JMSException}. The {@code String}-to-primitive conversions may throw a runtime
* exception if the primitive's {@code valueOf()} method does not accept it as a valid {@code 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
* {@code valueOf(String)} conversion method with a null value. Since {@code char} does not support a {@code String}
* conversion, attempting to read a null value as a {@code char} must throw a {@code NullPointerException}.
*
* @see javax.jms.Session#createStreamMessage()
* @see javax.jms.BytesMessage
* @see javax.jms.MapMessage
* @see javax.jms.Message
* @see javax.jms.ObjectMessage
* @see javax.jms.TextMessage
*
* @version Jakarta Messaging 2.0
* @since JMS 1.0
*/
public interface StreamMessage extends Message {
/**
* Reads a {@code boolean} from the stream message.
*
* @return the {@code boolean} value read
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
boolean readBoolean() throws JMSException;
/**
* Reads a {@code byte} value from the stream message.
*
* @return the next byte from the stream message as a 8-bit {@code byte}
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
byte readByte() throws JMSException;
/**
* Reads a 16-bit integer from the stream message.
*
* @return a 16-bit integer from the stream message
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
short readShort() throws JMSException;
/**
* Reads a Unicode character value from the stream message.
*
* @return a Unicode character from the stream message
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid
* @exception MessageNotReadableException if the message is in write-only mode.
*/
char readChar() throws JMSException;
/**
* Reads a 32-bit integer from the stream message.
*
* @return a 32-bit integer value from the stream message, interpreted as an {@code int}
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
int readInt() throws JMSException;
/**
* Reads a 64-bit integer from the stream message.
*
* @return a 64-bit integer value from the stream message, interpreted as a {@code long}
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
long readLong() throws JMSException;
/**
* Reads a {@code float} from the stream message.
*
* @return a {@code float} value from the stream message
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
float readFloat() throws JMSException;
/**
* Reads a {@code double} from the stream message.
*
* @return a {@code double} value from the stream message
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
double readDouble() throws JMSException;
/**
* Reads a {@code String} from the stream message.
*
* @return a Unicode string from the stream message
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*/
String readString() throws JMSException;
/**
* Reads a byte array field from the stream message into the specified {@code byte[]} object (the read buffer).
*
*
* To read the field value, {@code 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 {@code readBytes} returns a value equal to the length of the buffer, a subsequent {@code 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, {@code readBytes} returns -1.
*
*
* If the byte array field value is empty, {@code readBytes} returns 0.
*
*
* Once the first {@code readBytes} call on a {@code 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 {@code MessageFormatException}.
*
*
* To read the byte field value into a new {@code byte[]} object, use the {@code readObject} method.
*
* @param value the buffer into which the data is read
*
* @return 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
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*
* @see #readObject()
*/
int readBytes(byte[] value) 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 {@code writeObject} method call, or its equivalent primitive
* writetype method.
*
*
* Note that byte values are returned as {@code byte[]}, not {@code Byte[]}.
*
*
* An attempt to call {@code readObject} to read a byte field value into a new {@code byte[]} object before the full
* value of the byte field has been read will throw a {@code MessageFormatException}.
*
* @return a Java object from the stream message, in objectified format (for example, if the object was written as an
* {@code int}, an {@code Integer} is returned)
*
* @exception JMSException if the Jakarta Messaging provider fails to read the message due to some internal error.
* @exception MessageEOFException if unexpected end of message stream has been reached.
* @exception MessageFormatException if this type conversion is invalid.
* @exception MessageNotReadableException if the message is in write-only mode.
*
* @see #readBytes(byte[] value)
*/
Object readObject() throws JMSException;
/**
* Writes a {@code boolean} to the stream message. The value {@code true} is written as the value {@code (byte)1}; the
* value {@code false} is written as the value {@code (byte)0}.
*
* @param value the {@code boolean} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeBoolean(boolean value) throws JMSException;
/**
* Writes a {@code byte} to the stream message.
*
* @param value the {@code byte} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeByte(byte value) throws JMSException;
/**
* Writes a {@code short} to the stream message.
*
* @param value the {@code short} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeShort(short value) throws JMSException;
/**
* Writes a {@code char} to the stream message.
*
* @param value the {@code char} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeChar(char value) throws JMSException;
/**
* Writes an {@code int} to the stream message.
*
* @param value the {@code int} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeInt(int value) throws JMSException;
/**
* Writes a {@code long} to the stream message.
*
* @param value the {@code long} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeLong(long value) throws JMSException;
/**
* Writes a {@code float} to the stream message.
*
* @param value the {@code float} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeFloat(float value) throws JMSException;
/**
* Writes a {@code double} to the stream message.
*
* @param value the {@code double} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeDouble(double value) throws JMSException;
/**
* Writes a {@code String} to the stream message.
*
* @param value the {@code String} value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeString(String value) throws JMSException;
/**
* Writes a byte array field to the stream message.
*
*
* The byte array {@code 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.
*
* @param value the byte array value to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeBytes(byte[] value) 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 {@code 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.
*
* @param value the byte array value to be written
* @param offset the initial offset within the byte array
* @param length the number of bytes to use
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeBytes(byte[] value, int offset, int length) throws JMSException;
/**
* Writes an object to the stream message.
*
*
* This method works only for the objectified primitive object types ({@code Integer}, {@code Double},
* {@code Long} ...), {@code String} objects, and byte arrays.
*
* @param value the Java object to be written
*
* @exception JMSException if the Jakarta Messaging provider fails to write the message due to some internal error.
* @exception MessageFormatException if the object is invalid.
* @exception MessageNotWriteableException if the message is in read-only mode.
*/
void writeObject(Object value) throws JMSException;
/**
* Puts the message body in read-only mode and repositions the stream to the beginning.
*
* @exception JMSException if the Jakarta Messaging provider fails to reset the message due to some internal error.
* @exception MessageFormatException if the message has an invalid format.
*/
void reset() throws JMSException;
}