summaryrefslogtreecommitdiff
path: root/TAO/examples/Content_Server/SMI_Iterator/README
diff options
context:
space:
mode:
Diffstat (limited to 'TAO/examples/Content_Server/SMI_Iterator/README')
-rw-r--r--TAO/examples/Content_Server/SMI_Iterator/README76
1 files changed, 76 insertions, 0 deletions
diff --git a/TAO/examples/Content_Server/SMI_Iterator/README b/TAO/examples/Content_Server/SMI_Iterator/README
new file mode 100644
index 00000000000..f89a45e7747
--- /dev/null
+++ b/TAO/examples/Content_Server/SMI_Iterator/README
@@ -0,0 +1,76 @@
+This program illustrates how to implement a simple client and server
+using CORBA, IIOP, and synchronous method invocations (SMI). Client
+applications can use this service to download and display files from a
+CORBA server on the network. The core functionality of this program
+is as follows:
+
+ * Client applications will use an iterator to download and display
+ files from a CORBA server one ``chunk'' at a time, rather
+ than in one large chunk. This design will help improve the
+ memory management overhead on the client and server.
+
+ * Operations in the IDL interface will use exceptions to propagate
+ problems back to clients.
+
+ * The CORBA Naming Service is used to bind and resolve object
+ references, rather than using a file.
+
+The client program performs the following activities:
+
+ 1. From the command-line, it reads the name of the pathname
+ you want to download. It then initializes the client-side
+ ORB and uses resolve_initial_references() to obtain a
+ reference to a Naming Service (which must be running). This
+ object reference is then downcast via _narrow() to an
+ object reference for a CosNaming::NamingContext interface,
+ which is then used to resolve the object reference that the
+ server bound earlier. After narrowing this to the Server
+ interface, the get_iterator() operation is called via the
+ object reference to obtain the Chunk_Iterator, which is
+ used to download the file.
+
+ 2. When next_chunk() returns a chunk of the file, the contents
+ are written into a temporary file created in your a cache
+ (e.g., /tmp/yourloginname) on the local host. Then, an
+ external viewer is spawned to display the file. The type
+ of viewer to spawn is determined by examining the the
+ content_type_ metadata returned by the server.
+
+The example can be run as follows:
+
+ 1. Start the Name Service:
+
+ $ NameService -o /tmp/ns.ior
+
+ 2. Start the SMI Content Server:
+
+ $ server -ORBInitRef NameService=file:///tmp/ns.ior
+
+ 3. Request a file using the client:
+
+ $ client -ORBInitRef NameService=file:///tmp/ns.ior \
+ ~/foo.jpg
+
+This particular example can only service one file at a time.
+
+
+Server output should look like the following:
+
+$ ./server -ORBInitRef NameService=file:///tmp/ns.ior
+Bound <Iterator_Factory> to <IOR:010000002400000049444c3a57653625f5365727665722f4974657261746f725f466163746f72793a312e300001000000000000007c000000010102001400000076616c696e6f12722e6563652e7563692e65647500f39600001b00000014010f00525354bd9d4e39a6ac03000000000001000000010000000003000000000000000800000001000000004f4154010000001400000001ad85e4001000100000000000901010000000000004f41540400000001ac0000> in Name Service.
+Accepting requests.
+Received request for file: </home/myhome/foo.jpg>
+Sending chunk 1 at offset <0> of size <8192>
+Sending chunk 2 at offset <8192> of size <8192>
+Sending chunk 3 at offset <16384> of size <8192>
+Sending chunk 4 at offset <24576> of size <8192>
+Sending chunk 5 at offset <32768> of size <4573>
+
+
+Client output should look similar to:
+
+$ ./client -ORBInitRef NameService=file:///tmp/ns.ior ~/foo.jpg
+File </home/my_home/foo.jpg> has the following characteristics:
+ Modification Date: Wed, 01 Jan 2000 09:21:08 GMT
+ Content Type: image/jpeg
+Spawned viewer <xv> with PID <10870>.