Class HessianOutput


  • public class HessianOutput
    extends AbstractHessianOutput
    Output stream for Hessian requests, compatible with microedition Java. It only uses classes and types available in JDK.

    Since HessianOutput does not depend on any classes other than in the JDK, it can be extracted independently into a smaller package.

    HessianOutput is unbuffered, so any client needs to provide its own buffering.

     OutputStream os = ...; // from http connection
     HessianOutput out = new HessianOutput(os);
     String value;
    
     out.startCall("hello");  // start hello call
     out.writeString("arg1"); // write a string argument
     out.completeCall();      // complete the call
     
    • Constructor Summary

      Constructors 
      Constructor Description
      HessianOutput()
      Creates an uninitialized Hessian output stream.
      HessianOutput​(java.io.OutputStream os)
      Creates a new Hessian output stream, initialized with an underlying output stream.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean addRef​(java.lang.Object object)
      If the object has already been written, just write its ref.
      void call​(java.lang.String method, java.lang.Object[] args)
      Writes a complete method call.
      void close()  
      void completeCall()
      Completes.
      void completeReply()
      Completes reading the reply
      void flush()  
      int getRef​(java.lang.Object obj)  
      void init​(java.io.OutputStream os)
      Initializes the output
      void printLenString​(java.lang.String v)
      Prints a string to the stream, encoded as UTF-8 with preceeding length
      void printString​(char[] v, int offset, int length)
      Prints a string to the stream, encoded as UTF-8
      void printString​(java.lang.String v)
      Prints a string to the stream, encoded as UTF-8
      void printString​(java.lang.String v, int offset, int length)
      Prints a string to the stream, encoded as UTF-8
      boolean removeRef​(java.lang.Object obj)
      Removes a reference.
      boolean replaceRef​(java.lang.Object oldRef, java.lang.Object newRef)
      Replaces a reference from one object to another.
      void resetReferences()
      Resets the references for streaming.
      void setVersion​(int version)
      Sets the client's version.
      void startCall()
      Writes the call tag.
      void startCall​(java.lang.String method, int length)
      Starts the method call.
      void startReply()
      Starts the reply
      void writeBoolean​(boolean value)
      Writes a boolean value to the stream.
      void writeByteBufferEnd​(byte[] buffer, int offset, int length)
      Writes a byte buffer to the stream.
      void writeByteBufferPart​(byte[] buffer, int offset, int length)
      Writes a byte buffer to the stream.
      void writeByteBufferStart()
      Writes a byte buffer to the stream.
      void writeBytes​(byte[] buffer)
      Writes a byte array to the stream.
      void writeBytes​(byte[] buffer, int offset, int length)
      Writes a byte array to the stream.
      void writeDouble​(double value)
      Writes a double value to the stream.
      void writeFault​(java.lang.String code, java.lang.String message, java.lang.Object detail)
      Writes a fault.
      void writeHeader​(java.lang.String name)
      Writes a header name.
      void writeInt​(int value)
      Writes an integer value to the stream.
      boolean writeListBegin​(int length, java.lang.String type)
      Writes the list header to the stream.
      void writeListEnd()
      Writes the tail of the list to the stream.
      void writeLong​(long value)
      Writes a long value to the stream.
      void writeMapBegin​(java.lang.String type)
      Writes the map header to the stream.
      void writeMapEnd()
      Writes the tail of the map to the stream.
      void writeMethod​(java.lang.String method)
      Writes the method tag.
      void writeNull()
      Writes a null value to the stream.
      void writeObject​(java.lang.Object object)
      Writes any object to the output stream.
      void writePlaceholder()
      Writes a placeholder.
      void writeRef​(int value)
      Writes a reference.
      void writeRemote​(java.lang.String type, java.lang.String url)
      Writes a remote object reference to the stream.
      void writeString​(char[] buffer, int offset, int length)
      Writes a string value to the stream using UTF-8 encoding.
      void writeString​(java.lang.String value)
      Writes a string value to the stream using UTF-8 encoding.
      void writeUTCDate​(long time)
      Writes a date to the stream.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • os

        protected java.io.OutputStream os
    • Constructor Detail

      • HessianOutput

        public HessianOutput​(java.io.OutputStream os)
        Creates a new Hessian output stream, initialized with an underlying output stream.
        Parameters:
        os - the underlying output stream.
      • HessianOutput

        public HessianOutput()
        Creates an uninitialized Hessian output stream.
    • Method Detail

      • init

        public void init​(java.io.OutputStream os)
        Initializes the output
        Overrides:
        init in class AbstractHessianOutput
      • setVersion

        public void setVersion​(int version)
        Sets the client's version.
      • call

        public void call​(java.lang.String method,
                         java.lang.Object[] args)
                  throws java.io.IOException
        Writes a complete method call.
        Overrides:
        call in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • startCall

        public void startCall​(java.lang.String method,
                              int length)
                       throws java.io.IOException
        Starts the method call. Clients would use startCall instead of call if they wanted finer control over writing the arguments, or needed to write headers.
         c major minor
         m b16 b8 method-name
         
        Specified by:
        startCall in class AbstractHessianOutput
        Parameters:
        method - the method name to call.
        Throws:
        java.io.IOException
      • startCall

        public void startCall()
                       throws java.io.IOException
        Writes the call tag. This would be followed by the headers and the method tag.
         c major minor
         
        Specified by:
        startCall in class AbstractHessianOutput
        Parameters:
        method - the method name to call.
        Throws:
        java.io.IOException
      • writeMethod

        public void writeMethod​(java.lang.String method)
                         throws java.io.IOException
        Writes the method tag.
         m b16 b8 method-name
         
        Specified by:
        writeMethod in class AbstractHessianOutput
        Parameters:
        method - the method name to call.
        Throws:
        java.io.IOException
      • completeCall

        public void completeCall()
                          throws java.io.IOException
        Completes.
         z
         
        Specified by:
        completeCall in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • startReply

        public void startReply()
                        throws java.io.IOException
        Starts the reply

        A successful completion will have a single value:

         r
         
        Overrides:
        startReply in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • completeReply

        public void completeReply()
                           throws java.io.IOException
        Completes reading the reply

        A successful completion will have a single value:

         z
         
        Overrides:
        completeReply in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeHeader

        public void writeHeader​(java.lang.String name)
                         throws java.io.IOException
        Writes a header name. The header value must immediately follow.
         H b16 b8 foo value
         
        Overrides:
        writeHeader in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeFault

        public void writeFault​(java.lang.String code,
                               java.lang.String message,
                               java.lang.Object detail)
                        throws java.io.IOException
        Writes a fault. The fault will be written as a descriptive string followed by an object:
         f
         <string>code
         <string>the fault code
        
         <string>message
         <string>the fault mesage
        
         <string>detail
         mt\x00\xnnjavax.ejb.FinderException
             ...
         z
         z
         
        Overrides:
        writeFault in class AbstractHessianOutput
        Parameters:
        code - the fault code, a three digit
        Throws:
        java.io.IOException
      • writeObject

        public void writeObject​(java.lang.Object object)
                         throws java.io.IOException
        Writes any object to the output stream.
        Specified by:
        writeObject in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeListBegin

        public boolean writeListBegin​(int length,
                                      java.lang.String type)
                               throws java.io.IOException
        Writes the list header to the stream. List writers will call writeListBegin followed by the list contents and then call writeListEnd.
         V
         t b16 b8 type
         l b32 b24 b16 b8
         
        Specified by:
        writeListBegin in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeListEnd

        public void writeListEnd()
                          throws java.io.IOException
        Writes the tail of the list to the stream.
        Specified by:
        writeListEnd in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeMapBegin

        public void writeMapBegin​(java.lang.String type)
                           throws java.io.IOException
        Writes the map header to the stream. Map writers will call writeMapBegin followed by the map contents and then call writeMapEnd.
         Mt b16 b8 ( )z
         
        Specified by:
        writeMapBegin in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeMapEnd

        public void writeMapEnd()
                         throws java.io.IOException
        Writes the tail of the map to the stream.
        Specified by:
        writeMapEnd in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeRemote

        public void writeRemote​(java.lang.String type,
                                java.lang.String url)
                         throws java.io.IOException
        Writes a remote object reference to the stream. The type is the type of the remote interface.
         'r' 't' b16 b8 type url
         
        Throws:
        java.io.IOException
      • writeBoolean

        public void writeBoolean​(boolean value)
                          throws java.io.IOException
        Writes a boolean value to the stream. The boolean will be written with the following syntax:
         T
         F
         
        Specified by:
        writeBoolean in class AbstractHessianOutput
        Parameters:
        value - the boolean value to write.
        Throws:
        java.io.IOException
      • writeInt

        public void writeInt​(int value)
                      throws java.io.IOException
        Writes an integer value to the stream. The integer will be written with the following syntax:
         I b32 b24 b16 b8
         
        Specified by:
        writeInt in class AbstractHessianOutput
        Parameters:
        value - the integer value to write.
        Throws:
        java.io.IOException
      • writeLong

        public void writeLong​(long value)
                       throws java.io.IOException
        Writes a long value to the stream. The long will be written with the following syntax:
         L b64 b56 b48 b40 b32 b24 b16 b8
         
        Specified by:
        writeLong in class AbstractHessianOutput
        Parameters:
        value - the long value to write.
        Throws:
        java.io.IOException
      • writeDouble

        public void writeDouble​(double value)
                         throws java.io.IOException
        Writes a double value to the stream. The double will be written with the following syntax:
         D b64 b56 b48 b40 b32 b24 b16 b8
         
        Specified by:
        writeDouble in class AbstractHessianOutput
        Parameters:
        value - the double value to write.
        Throws:
        java.io.IOException
      • writeUTCDate

        public void writeUTCDate​(long time)
                          throws java.io.IOException
        Writes a date to the stream.
         T  b64 b56 b48 b40 b32 b24 b16 b8
         
        Specified by:
        writeUTCDate in class AbstractHessianOutput
        Parameters:
        time - the date in milliseconds from the epoch in UTC
        Throws:
        java.io.IOException
      • writeNull

        public void writeNull()
                       throws java.io.IOException
        Writes a null value to the stream. The null will be written with the following syntax
         N
         
        Specified by:
        writeNull in class AbstractHessianOutput
        Parameters:
        value - the string value to write.
        Throws:
        java.io.IOException
      • writeString

        public void writeString​(java.lang.String value)
                         throws java.io.IOException
        Writes a string value to the stream using UTF-8 encoding. The string will be written with the following syntax:
         S b16 b8 string-value
         
        If the value is null, it will be written as
         N
         
        Specified by:
        writeString in class AbstractHessianOutput
        Parameters:
        value - the string value to write.
        Throws:
        java.io.IOException
      • writeString

        public void writeString​(char[] buffer,
                                int offset,
                                int length)
                         throws java.io.IOException
        Writes a string value to the stream using UTF-8 encoding. The string will be written with the following syntax:
         S b16 b8 string-value
         
        If the value is null, it will be written as
         N
         
        Specified by:
        writeString in class AbstractHessianOutput
        Parameters:
        value - the string value to write.
        Throws:
        java.io.IOException
      • writeBytes

        public void writeBytes​(byte[] buffer)
                        throws java.io.IOException
        Writes a byte array to the stream. The array will be written with the following syntax:
         B b16 b18 bytes
         
        If the value is null, it will be written as
         N
         
        Specified by:
        writeBytes in class AbstractHessianOutput
        Parameters:
        value - the string value to write.
        Throws:
        java.io.IOException
      • writeBytes

        public void writeBytes​(byte[] buffer,
                               int offset,
                               int length)
                        throws java.io.IOException
        Writes a byte array to the stream. The array will be written with the following syntax:
         B b16 b18 bytes
         
        If the value is null, it will be written as
         N
         
        Specified by:
        writeBytes in class AbstractHessianOutput
        Parameters:
        value - the string value to write.
        Throws:
        java.io.IOException
      • writeByteBufferStart

        public void writeByteBufferStart()
                                  throws java.io.IOException
        Writes a byte buffer to the stream.
         
        Specified by:
        writeByteBufferStart in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeByteBufferPart

        public void writeByteBufferPart​(byte[] buffer,
                                        int offset,
                                        int length)
                                 throws java.io.IOException
        Writes a byte buffer to the stream.
         b b16 b18 bytes
         
        Specified by:
        writeByteBufferPart in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeByteBufferEnd

        public void writeByteBufferEnd​(byte[] buffer,
                                       int offset,
                                       int length)
                                throws java.io.IOException
        Writes a byte buffer to the stream.
         b b16 b18 bytes
         
        Specified by:
        writeByteBufferEnd in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • writeRef

        public void writeRef​(int value)
                      throws java.io.IOException
        Writes a reference.
         R b32 b24 b16 b8
         
        Specified by:
        writeRef in class AbstractHessianOutput
        Parameters:
        value - the integer value to write.
        Throws:
        java.io.IOException
      • writePlaceholder

        public void writePlaceholder()
                              throws java.io.IOException
        Writes a placeholder.
         P
         
        Throws:
        java.io.IOException
      • addRef

        public boolean addRef​(java.lang.Object object)
                       throws java.io.IOException
        If the object has already been written, just write its ref.
        Specified by:
        addRef in class AbstractHessianOutput
        Parameters:
        object - the object to add as a reference.
        Returns:
        true if we're writing a ref.
        Throws:
        java.io.IOException
      • removeRef

        public boolean removeRef​(java.lang.Object obj)
                          throws java.io.IOException
        Removes a reference.
        Overrides:
        removeRef in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • replaceRef

        public boolean replaceRef​(java.lang.Object oldRef,
                                  java.lang.Object newRef)
                           throws java.io.IOException
        Replaces a reference from one object to another.
        Specified by:
        replaceRef in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • printLenString

        public void printLenString​(java.lang.String v)
                            throws java.io.IOException
        Prints a string to the stream, encoded as UTF-8 with preceeding length
        Parameters:
        v - the string to print.
        Throws:
        java.io.IOException
      • printString

        public void printString​(java.lang.String v)
                         throws java.io.IOException
        Prints a string to the stream, encoded as UTF-8
        Parameters:
        v - the string to print.
        Throws:
        java.io.IOException
      • printString

        public void printString​(java.lang.String v,
                                int offset,
                                int length)
                         throws java.io.IOException
        Prints a string to the stream, encoded as UTF-8
        Parameters:
        v - the string to print.
        Throws:
        java.io.IOException
      • printString

        public void printString​(char[] v,
                                int offset,
                                int length)
                         throws java.io.IOException
        Prints a string to the stream, encoded as UTF-8
        Parameters:
        v - the string to print.
        Throws:
        java.io.IOException
      • flush

        public void flush()
                   throws java.io.IOException
        Overrides:
        flush in class AbstractHessianOutput
        Throws:
        java.io.IOException
      • close

        public void close()
                   throws java.io.IOException
        Overrides:
        close in class AbstractHessianOutput
        Throws:
        java.io.IOException