Examples of org.smpp.Session

org.smpp.Session
Class Session provides all methods necessary for communication with SMSC using SMPP protocol, i.e. methods for sending PDUs as defined in SMPP specification as well as receiving responses for sent PDUs and waiting for PDUs whose sending was initiated by SMSC.
Instance of Session represents one connection of ESME to a SMSC. Multiple connections can be established using multiple Sessions.
Session uses Connection object which is instantiated outside of the Session. This way is the Session made independent on the communication protocol and Session's code isn't populated by protocol dependent initialisation.
Code example of binding, sending one message and unbinding:
```
 Connection conn = new TCPIPConnection("123.123.123.123", 6543); Session session = new Session(conn); BindRequest breq = new BindTransmitter(); breq.setSystemId("MYNAME"); breq.setPassword("my_pswdx"); Response resp = session.bind(breq); if (resp.getCommandStatus() == Data.ESME_ROK) { SubmitSM msg = new SubmitSM(); msg.setSourceAddr("3538998765432"); msg.setDestAddr("3538619283746"); msg.setShortMessage("Hello, world!"); resp = session.submit(msg); if (resp.getCommandStatus() == Data.ESME_ROK) { System.out.println("Message submitted. Status=" + resp.getCommandStatus()); } else { System.out.println("Message submission failed. Status=" + resp.getCommandStatus()); } session.unbind(); } else { System.out.println("Couldn't bind. Status=" + resp.getCommandStatus()); } 
```
Note that the cycle bind - send PDU's - unbind can be called several times for once created session.
Particular methods for sending PDUs to SMSC return responses to the sent PDUs. They return null if no response is received in time specified by the receive timeout in receiver. This means that the methods wait for response corresponding to the request. The corresponding response is recognized using sequence number of the sent PDU and a corresponding response command id.
The session can work in assynchronous manner, i.e. it doesn't wait for response for the sent request, instead all responses are handled by instance of callback class ServerPDUEventListener whenever they are received.
The Session class checks if operations invoked are valid in the current state of the session. If not, then such operation throws WrongSessionStateException expcetion. For example it's incorrect to try to submit a message if the session is bound as receiver. The checking if the operation is valid in the current state of session is turned off by default. @author Logica Mobile Networks SMPP Open Source Team @version $Revision: 1.4 $ @see Connection @see Transmitter @see Receiver @see ServerPDUEventListener

        SessionPoolImpl pool = new TestSessionPool(10, 3, 7);
        Iterator i = pool.iterator();
        int count = 0;
        // Should invalidate the available sessions (not any currently active).
        while (i.hasNext()) {
            Session session = (Session) i.next();
            pool.invalidateObject(session);
            count++;
        }
        assertEquals(7, count);
    }

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    public void testBorrowObjectWhenEmpty() throws Exception {
        SessionPoolImpl pool = new TestSessionPool(5, 0, 0);
        assertEquals(0, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
        Session session = (Session) pool.borrowObject();
        assertEquals(1, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
    }

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    public void testBorrowObjectWhenSessionIsAvailable() throws Exception {
        SessionPoolImpl pool = new TestSessionPool(5, 0, 1);
        assertEquals(0, pool.getNumActive());
        assertEquals(1, pool.getNumIdle());
        Session session = (Session) pool.borrowObject();
        assertEquals(1, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
    }

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        assertEquals(0, pool.getNumActive());
        assertEquals(3, pool.getNumIdle());


        // Should ignore the first invalid element and return the second valid
        // session.
        Session session = (Session) pool.borrowObject();


        // Can't check the number of idle Sessions at this point, because the
        // objects in the set could be returned in any order.
        assertEquals(1, pool.getNumActive());


        // There was only one valid session in the pool, so when a second one
        // is requested this should guarantee that the invalid ones are removed
        // and a new one is created (because we still have room).
        Session sessionTwo = (Session) pool.borrowObject();
        assertNotEquals(invalidObject, sessionTwo);
        assertNotEquals(invalidObjectTwo, sessionTwo);
        assertNotEquals(session, sessionTwo);
        assertEquals(2, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());

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        assertEquals(0, pool.getNumActive());
        assertEquals(3, pool.getNumIdle());


        // Should ignore the first invalid element and return the second valid
        // session.
        Session session = (Session) pool.borrowObject();


        // Can't check the number of idle Sessions at this point, because the
        // objects in the set could be returned in any order.
        assertEquals(1, pool.getNumActive());


        // There was only one valid session in the pool, so when a second one
        // is requested this should guarantee that the invalid ones are removed
        // and a new one is created (because we still have room).
        Session sessionTwo = (Session) pool.borrowObject();
        assertNotEquals(invalidObject, sessionTwo);
        assertNotEquals(invalidObjectTwo, sessionTwo);
        assertNotEquals(session, sessionTwo);
        assertEquals(2, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());

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        assertEquals(0, pool.getNumIdle());
    }


    public void testReturnObjectWhenFromPool() throws Exception {
        SessionPoolImpl pool = new TestSessionPool(5, 0, 0);
        Session session = (Session) pool.borrowObject();
        assertEquals(1, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
        pool.returnObject(session);
        assertEquals(0, pool.getNumActive());
        assertEquals(1, pool.getNumIdle());

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    public void testReturnObjectWhenNotFromPool() throws Exception {
        SessionPoolImpl pool = new TestSessionPool(5, 0, 0);
        pool.borrowObject();
        assertEquals(1, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
        Session session = (Session) sessionFactory.makeObject();
        try {
            pool.returnObject(session);
            fail("Should throw an exception if attempting to return an " +
                    "object to a pool which wasn't in it.");
        } catch (SessionException e) {

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    public void testReturnObjectWhenNoneActive() throws Exception {
        SessionPoolImpl pool = new TestSessionPool(5, 0, 0);
        // Try to return an object that did come from this pool, but is not
        // active at present (returning objects that didn't come from this pool
        // is captured in #testBorrowObjectWhenNotFromPool)
        Session session = (Session) pool.borrowObject();
        pool.returnObject(session);
        try {
            pool.returnObject(session);
            fail("Should throw an exception if attempting to return an " +
                    "object to a pool which wasn't in it.");

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        }
    }


    public void testInvalidateActiveSession() throws Exception {
        SessionPoolImpl pool = new TestSessionPool(5, 0, 0);
        Session session = (Session) pool.borrowObject();
        assertEquals(1, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
        pool.invalidateObject(session);
        assertEquals(0, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());

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    }


    public void testInvalidateAvailableSession() throws Exception {
        SessionPoolImpl pool = new TestSessionPool(5, 0, 1);
        assertEquals(1, pool.available.size());
        Session session = (Session)pool.available.iterator().next();
        assertEquals(0, pool.getNumActive());
        assertEquals(1, pool.getNumIdle());
        pool.invalidateObject(session);
        assertEquals(0, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());

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