abstractmessagehandler.java

来自「OpenJMS是一个开源的Java Message Service API 1.」· Java 代码 · 共 461 行 · 第 1/2 页

     *
     * @param messageId the message identifier
     * @param message   the message to populate
     * @throws JMSException         for any JMS error
     * @throws PersistenceException for any persistence error
     */
    protected void getProperties(String messageId, Message message)
            throws JMSException, PersistenceException {

        Map properties = getProperties(messageId);
        Iterator iterator = properties.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            String name = (String) entry.getKey();
            Object value = entry.getValue();
            message.setObjectProperty(name, value);
        }
    }

    /**
     * Add a message.
     *
     * @param message the message to add
     * @param type    the type of the message
     * @throws JMSException         for any JMS error
     * @throws PersistenceException for any persistence error
     */
    protected void add(Message message, String type)
            throws JMSException, PersistenceException {

        PreparedStatement insert = null;
        String messageId = null;
        try {
            insert = _connection.prepareStatement(
                    "insert into " + MESSAGE_TABLE
                    + " values  (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");

            messageId = message.getJMSMessageID();

            long destinationId = _destinations.getId(
                    (JmsDestination) message.getJMSDestination());
            
            // insert message header
            insert.setString(1, messageId);
            insert.setString(2, type);
            insert.setString(3, message.getJMSCorrelationID());
            insert.setInt(4, message.getJMSDeliveryMode());
            insert.setLong(5, destinationId);
            insert.setLong(6, message.getJMSExpiration());
            insert.setInt(7, message.getJMSPriority());
            insert.setBoolean(8, message.getJMSRedelivered());
            long replyToId = 0;
            if (message.getJMSReplyTo() != null) {
                JmsDestination replyTo =
                        (JmsDestination) message.getJMSReplyTo();
                replyToId = _destinations.getId(replyTo);
            }
            insert.setLong(9, replyToId);
            insert.setLong(10, message.getJMSTimestamp());
            insert.setString(11, message.getJMSType());
            Object body = getBody(message);
            byte[] blob;
            try {
                blob = serialize(body);
            } catch (Exception exception) {
                throw new PersistenceException(
                        "Failed to serialize message body, JMSMessageID="
                        + messageId, exception);
            }
            insert.setObject(12, blob);

            insert.executeUpdate();
            
            // insert header properties
            Enumeration iterator = message.getPropertyNames();
            while (iterator.hasMoreElements()) {
                String name = (String) iterator.nextElement();
                Object value = message.getObjectProperty(name);
                addProperty(messageId, name, value);
            }
            _connection.commit();
        } catch (SQLException exception) {
            throw new PersistenceException(
                    "Failed to add message, JMSMessageID=" + messageId,
                    exception);
        } finally {
            SQLHelper.close(insert);
        }
    }

    /**
     * Returns properties for a message.
     *
     * @param messageId the message identifier
     * @return a map of properties
     * @throws PersistenceException for any persistence error
     */
    protected Map getProperties(String messageId)
            throws PersistenceException {

        HashMap result = new HashMap();

        PreparedStatement select = null;
        ResultSet set = null;
        try {
            select = _connection.prepareStatement(
                    "select name, value from " + MESSAGE_PROPERTIES_TABLE
                    + " where message_id = ?");
            select.setString(1, messageId);
            set = select.executeQuery();
            while (set.next()) {
                String name = set.getString("name");
                Blob blob = set.getBlob("value");
                Object value;
                try {
                    value = deserialize(blob);
                } catch (Exception exception) {
                    String message = "Failed to destream property for "
                            + "message, JMSMessageID=" + messageId
                            + ", property=" + name;
                    throw new PersistenceException(message, exception);
                }
                result.put(name, value);
            }
        } catch (SQLException exception) {
            throw new PersistenceException(
                    "Failed to get properties for message, JMSMessageID="
                    + messageId, exception);
        } finally {
            SQLHelper.close(set);
            SQLHelper.close(select);
        }
        return result;
    }

    /**
     * Add a property.
     *
     * @param messageId the message identifier
     * @param name      the property name
     * @param value     the property value
     * @throws PersistenceException for any persistence error
     */
    protected void addProperty(String messageId,
                               String name, Object value)
            throws PersistenceException {

        byte[] blob;
        try {
            blob = serialize(value);
        } catch (IOException exception) {
            String message = "Failed to serialize property for message, "
                    + "JMSMessageID=" + messageId + ", name=" + name;
            if (value != null) {
                message += " of type " + value.getClass().getName();
            }
            throw new PersistenceException(message, exception);
        }

        PreparedStatement insert = null;
        try {
            insert = _connection.prepareStatement(
                    "insert into " + MESSAGE_PROPERTIES_TABLE
                    + " values (?, ?, ?)");
            insert.setString(1, messageId);
            insert.setString(2, name);
            insert.setObject(3, blob);
            insert.executeUpdate();
        } catch (SQLException exception) {
            throw new PersistenceException(
                    "Failed to add property for message, JMSMessageID="
                    + messageId + ", name=" + name + ", value=" + value,
                    exception);
        } finally {
            SQLHelper.close(insert);
        }
    }

    /**
     * Helper to serialize an object to a byte array.
     *
     * @param object the object to serialize
     * @return the serialized object
     * @throws IOException if the object cannot be serialized
     */
    public byte[] serialize(Object object) throws IOException {
        byte[] result;
        ByteArrayOutputStream bstream = new ByteArrayOutputStream();
        ObjectOutputStream ostream = new ObjectOutputStream(bstream);
        ostream.writeObject(object);
        ostream.close();
        result = bstream.toByteArray();
        return result;
    }

    /**
     * Helper to deserialize an object from a byte array.
     *
     * @param blob the blob containing object to deserialize
     * @return the destreamed object
     * @throws ClassNotFoundException if the class of a serialized object cannot
     *                                be found.
     * @throws IOException            if the object cannot be deserialized
     * @throws SQLException           if there is an error accessing the
     *                                <code>blob</code>
     */
    protected Object deserialize(Blob blob)
            throws ClassNotFoundException, IOException, SQLException {
        Object result = null;

        if (blob != null) {
            ObjectInputStream istream = new ObjectInputStream(
                    blob.getBinaryStream());
            result = istream.readObject();
            istream.close();
        }
        return result;
    }

    /**
     * Returns the database connection.
     *
     * @return the connection to the database
     */
    protected Connection getConnection() {
        return _connection;
    }

}