org.apache.camel.Header Java Examples

/**
 * Generate ratings for the items
 * <p/>
 * Notice how the items is mapped to @Header with the name ids, which
 * refers to the context-path {ids} in the rest-dsl service
 */
public List<RatingDto> ratings(@Header("ids") String items) {
    System.out.println("Rating items " + items);

    List<RatingDto> answer = new ArrayList<>();

    for (String id : items.split(",")) {
        RatingDto dto = new RatingDto();
        answer.add(dto);

        dto.setItemNo(Integer.valueOf(id));
        // generate some random ratings
        dto.setRating(new Random().nextInt(100));
    }

    return answer;
}
 

public void processOrder(Exchange exchange, InputOrder order,
                         @Header(Exchange.REDELIVERED) Boolean redelivered) throws Exception {

    // simulate CPU processing of the order by sleeping a bit
    Thread.sleep(1000);

    // simulate fatal error if we refer to a special no
    if (order.getRefNo().equals("FATAL")) {
        throw new IllegalArgumentException("Simulated fatal error");
    }

    // simulate fail once if we have not yet redelivered, which means its the first
    // time processOrder method is called
    if (order.getRefNo().equals("FAIL-ONCE") && redelivered == null) {
        throw new IOException("Simulated failing once");
    }

    // processing is okay
}
 

/**
 * Generate ratings for the items
 * <p/>
 * Notice how the items is mapped to @Header with the name ids, which
 * refers to the context-path {ids} in the rest-dsl service
 */
public List<RatingDto> ratings(@Header("ids") String items) {
    System.out.println("Rating items " + items);

    List<RatingDto> answer = new ArrayList<>();

    for (String id : items.split(",")) {
        RatingDto dto = new RatingDto();
        answer.add(dto);

        dto.setItemNo(Integer.valueOf(id));
        // generate some random ratings
        dto.setRating(new Random().nextInt(100));
    }

    return answer;
}
 

public void processOrder(Exchange exchange, InputOrder order,
                         @Header(Exchange.REDELIVERED) Boolean redelivered) throws Exception {

    // simulate CPU processing of the order by sleeping a bit
    Thread.sleep(1000);

    // simulate fatal error if we refer to a special no
    if (order.getRefNo().equals("FATAL")) {
        throw new IllegalArgumentException("Simulated fatal error");
    }

    // simulate fail once if we have not yet redelivered, which means its the first
    // time processOrder method is called
    if (order.getRefNo().equals("FAIL-ONCE") && redelivered == null) {
        throw new IOException("Simulated failing once");
    }

    // processing is okay
}
 

public void insertAuditLog(String order, @Header("JMSRedelivered") boolean redelivery) throws Exception {
    // using old-school JdbcTemplate to perform a SQL operation from Java code with spring-jdbc
    JdbcTemplate jdbc = new JdbcTemplate(dataSource);
    String orderId = "" + ++counter;
    String orderValue = order;
    String orderRedelivery = "" + redelivery;

    jdbc.execute(String.format("insert into bookaudit (order_id, order_book, order_redelivery) values ('%s', '%s', '%s')",
            orderId, orderValue, orderRedelivery));
}
 

public void sendMail(String body, @Header("to") String to) {
    // simulate fatal error if we refer to a special no
    if (to.equals("FATAL")) {
        throw new IllegalArgumentException("Simulated fatal error");
    }

    // simulate CPU processing of the order by sleeping a bit
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        // ignore
    }
}
 

/**
 * The method invoked by Dynamic Router EIP to compute where to go next.
 * <p/>
 * Notice this method has been annotated with @DynamicRouter which means Camel turns this method
 * invocation into a Dynamic Router EIP automatically.
 *
 * @param body     the message body
 * @param previous the previous endpoint, is <tt>null</tt> on the first invocation
 * @return endpoint uri where to go, or <tt>null</tt> to indicate no more
 */
@DynamicRouter
public String route(String body, @Header(Exchange.SLIP_ENDPOINT) String previous) {
    if (previous == null) {
        // 1st time
        return "mock://a";
    } else if ("mock://a".equals(previous)) {
        // 2nd time - transform the message body using the simple language
        return "language://simple:Bye ${body}";
    } else {
        // no more, so return null to indicate end of dynamic router
        return null;
    }
}
 

public PurchaseOrder lookup(@Header("id") String id) {
    LOG.info("Finding purchase order for id " + id);
    // just return a fixed response
    PurchaseOrder order = new PurchaseOrder();
    order.setPrice(49.95);
    order.setAmount(1);
    order.setName("Camel in Action");
    return order;
}
 

public String combine(@Header("ERP") String erp, @Header("CRM") String crm, @Header("SHIPPING") String shipping) {
    StringBuilder sb = new StringBuilder("Customer overview");
    sb.append("\nERP: " + erp);
    sb.append("\nCRM: " + crm);
    sb.append("\nSHIPPING: " + shipping);
    return sb.toString();
}
 

@Handler
public Map getProcessVariables(@Body String body,
                               @Header(Exchange.FILE_NAME) String filename,
                               @Simple("${date:now:yyyy-MM-dd kk:mm:ss}") String timestamp) {
    Map<String, Object> variables = new HashMap<String, Object>();
    variables.put("message", body);
    variables.put("orderid", filename);
    variables.put("timestamp", timestamp);
    return variables;
}
 

/**
 * The method invoked by Dynamic Router EIP to compute where to go next.
 * <p/>
 * Notice this method has been annotated with @DynamicRouter which means Camel turns this method
 * invocation into a Dynamic Router EIP automatically.
 *
 * @param body     the message body
 * @param previous the previous endpoint, is <tt>null</tt> on the first invocation
 * @return endpoint uri where to go, or <tt>null</tt> to indicate no more
 */
@DynamicRouter
public String route(String body, @Header(Exchange.SLIP_ENDPOINT) String previous) {
    if (previous == null) {
        // 1st time
        return "mock://a";
    } else if ("mock://a".equals(previous)) {
        // 2nd time - transform the message body using the simple language
        return "language://simple:Bye ${body}";
    } else {
        // no more, so return null to indicate end of dynamic router
        return null;
    }
}
 

public PurchaseOrder lookup(@Header("id") String id) {
    LOG.info("Finding purchase order for id " + id);
    // just return a fixed response
    PurchaseOrder order = new PurchaseOrder();
    order.setPrice(69.99);
    order.setAmount(1);
    order.setName("Camel in Action");
    return order;
}
 

public void sendMail(String body, @Header("to") String to) {
    // simulate fatal error if we refer to a special no
    if (to.equals("FATAL")) {
        throw new IllegalArgumentException("Simulated fatal error");
    }

    // simulate CPU processing of the order by sleeping a bit
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        // ignore
    }
}
 

public Order getOrder(@Header("id") String id) {
    if ("123".equals(id)) {
        Order order = new Order();
        order.setId(123);
        order.setAmount(1);
        order.setMotor("Honda");
        return order;
    } else {
        return null;
    }
}
 

public String combine(@Header("ERP") String erp, @Header("CRM") String crm, @Header("SHIPPING") String shipping) {
    StringBuilder sb = new StringBuilder("Customer overview");
    sb.append("\nERP: " + erp);
    sb.append("\nCRM: " + crm);
    sb.append("\nSHIPPING: " + shipping);
    return sb.toString();
}
 

public Set<CartDto> getItems(@Header("sessionId") String sessionId) {
    LOG.info("getItems {}", sessionId);
    Set<CartDto> answer = content.get(sessionId);
    if (answer == null) {
        answer = Collections.emptySet();
    }
    return answer;
}
 

public void removeItem(@Header("sessionId") String sessionId, @Header("itemId") String itemId) {
    LOG.info("removeItem {} {}", sessionId, itemId);

    Set<CartDto> dtos = content.get(sessionId);
    if (dtos != null) {
        dtos.removeIf(i -> i.getItemId() == itemId);
    }
}
 

public void addItem(@Header("sessionId") String sessionId, @Body CartDto dto) {
    LOG.info("addItem {} {}", sessionId, dto);

    Set<CartDto> dtos = content.get(sessionId);
    if (dtos == null) {
        dtos = new LinkedHashSet<>();
        content.put(sessionId, dtos);
    }
    dtos.add(dto);
}
 

public Set<CartDto> getItems(@Header("sessionId") String sessionId) {
    LOG.info("getItems {}", sessionId);
    Set<CartDto> answer = content.get(sessionId);
    if (answer == null) {
        answer = Collections.EMPTY_SET;
    }
    return answer;
}
 

public void removeItem(@Header("sessionId") String sessionId, @Header("itemId") String itemId) {
    LOG.info("removeItem {} {}", sessionId, itemId);

    Set<CartDto> dtos = content.get(sessionId);
    if (dtos != null) {
        dtos.remove(itemId);
    }
}
 

public void addItem(@Header("sessionId") String sessionId, @Body CartDto dto) {
    LOG.info("addItem {} {}", sessionId, dto);

    Set<CartDto> dtos = content.get(sessionId);
    if (dtos == null) {
        dtos = new LinkedHashSet<>();
        content.put(sessionId, dtos);
    }
    dtos.add(dto);
}
 

public synchronized void reserveCredit(String id, @Header("amount") int amount) {
    int credit = getCredit();
    if (amount > credit) {
        throw new IllegalStateException("Insufficient credit");
    }
    reservations.put(id, amount);
}
 

public String orderStatus(@Header("customerId") Integer customerId, @Body Integer orderId) {
    return "Order " + orderId + " from customer " + customerId;
}
 

public String checkStatus(@Header("id") String id) throws Exception {
    if ("123".equals(id)) {
        return "Processing";
    }
    return "Complete";
}
 

public Object main(String body, @Header("name") String name) {
    return "Hello " + name + ". I got payload `" + body + "` and I am on host: " + System.getenv("HOSTNAME");
}
 

/**
 * The method invoked by Dynamic Router EIP to compute where to go next.
 *
 * @param body          the message body
 * @param previous   the previous endpoint, is <tt>null</tt> on the first invocation
 * @return endpoint uri where to go, or <tt>null</tt> to indicate no more
 */
public String route(String body, @Header(Exchange.SLIP_ENDPOINT) String previous) {
    return whereToGo(body, previous);
}
 

/**
 * The method invoked by Dynamic Router EIP to compute where to go next.
 *
 * @param body          the message body
 * @param previous   the previous endpoint, is <tt>null</tt> on the first invocation
 * @return endpoint uri where to go, or <tt>null</tt> to indicate no more
 */
public String route(String body, @Header(Exchange.SLIP_ENDPOINT) String previous) {
    return whereToGo(body, previous);
}
 

/**
 * The method used as funktion
 *
 * @param body  the message body
 * @param name  the header with the key name
 * @return the response from the funktion
 */
public Object cheese(String body, @Header("name") String name) {
    return "Hello " + name + ". I got payload `" + body + "` and I am on host: " + System.getenv("HOSTNAME");
}