import com.rabbitmq.client.LongString; //导入依赖的package包/类
/**
 * Strategy to test if the given header is valid. Without this, the
 * com.rabbitmq.client.impl.Frame.java class will throw an
 * IllegalArgumentException (invalid value in table) and close the
 * connection.
 *
 * @param headerValue the header value
 * @return the value to use, <tt>null</tt> to ignore this header
 * @see com.rabbitmq.client.impl.Frame#fieldValueSize
 */
private Object getValidRabbitMQHeaderValue(Object headerValue) {
    if (headerValue instanceof String) {
        return headerValue;
    } else if (headerValue instanceof Number) {
        return headerValue;
    } else if (headerValue instanceof Boolean) {
        return headerValue;
    } else if (headerValue instanceof Date) {
        return headerValue;
    } else if (headerValue instanceof byte[]) {
        return headerValue;
    } else if (headerValue instanceof LongString) {
        return headerValue;
    }

    return null;
}
 

import com.rabbitmq.client.LongString; //导入依赖的package包/类
static Map<String, Struct> headers(BasicProperties basicProperties) {
  Map<String, Object> input = basicProperties.getHeaders();
  Map<String, Struct> results = new LinkedHashMap<>();
  if (null != input) {
    for (Map.Entry<String, Object> kvp : input.entrySet()) {
      log.trace("headers() - key = '{}' value= '{}'", kvp.getKey(), kvp.getValue());
      final String field;
      final Object headerValue;

      if (kvp.getValue() instanceof LongString) {
        headerValue = kvp.getValue().toString();
      } else {
        headerValue = kvp.getValue();
      }

      if (!FIELD_LOOKUP.containsKey(headerValue.getClass())) {
        throw new DataException(
            String.format("Could not determine the type for field '%s' type '%s'", kvp.getKey(), headerValue.getClass().getName())
        );
      } else {
        field = FIELD_LOOKUP.get(headerValue.getClass());
      }

      log.trace("headers() - Storing value for header in field = '{}' as {}", field, field);

      Struct value = new Struct(SCHEMA_HEADER_VALUE)
          .put("type", field)
          .put(field, headerValue);
      results.put(kvp.getKey(), value);
    }
  }
  return results;
}
 

import com.rabbitmq.client.LongString; //导入依赖的package包/类
private void populateMessageHeadersFromRabbitMQHeaders(final Message message, final AMQP.BasicProperties properties) {
    Map<String, Object> headers = properties.getHeaders();
    if (headers != null) {
        for (Map.Entry<String, Object> entry : headers.entrySet()) {
            // Convert LongStrings to String.
            if (entry.getValue() instanceof LongString) {
                message.setHeader(entry.getKey(), entry.getValue().toString());
            } else {
                message.setHeader(entry.getKey(), entry.getValue());
            }
        }
    }
}
 

import com.rabbitmq.client.LongString; //导入依赖的package包/类
@Test
public void parseMessageHeaderIntoBackend() throws Exception {
	final Map<String, LongString> rabbitTraceeHeader = new HashMap<>();
	rabbitTraceeHeader.put(INVOCATION_ID_KEY, new TestLongString("Crazy ID"));

	unit.toMessageProperties(createRabbitHeaderWith(TPIC_HEADER, rabbitTraceeHeader), mock(Envelope.class), CHARSET_UTF8);

	assertThat(backend.copyToMap(), hasEntry(INVOCATION_ID_KEY, "Crazy ID"));
}
 

import com.rabbitmq.client.LongString; //导入依赖的package包/类
/**
 * Fixes a map so that we have valid data present
 *
 * @param m
 *
 * @return
 */
@SuppressWarnings("unchecked")
public static Map<String, Object> fixAMQPTable( Map<String, Object> m )
{
    if( m == null )
    {
        return Collections.emptyMap();
    }

    if( !m.isEmpty() )
    {
        Iterator<Map.Entry<String, Object>> it = m.entrySet().iterator();
        while( it.hasNext() )
        {
            Map.Entry<String, Object> e = it.next();
            Object value = e.getValue();
            // Convert certain types to supported ones otherwise
            if( value instanceof LongString )
            {
                e.setValue( value.toString() );
            }
            else if( value instanceof BigInteger )
            {
                // wrap in a decimal
                e.setValue( new BigDecimal( (BigInteger) value ) );
            }
            else if( value instanceof Map )
            {
                // Recurse
                e.setValue( fixAMQPTable( (Map<String, Object>) value ) );
            }
            else if( value instanceof Collection )
            {
                e.setValue( CollectionUtils.unmodifiableList( (Collection) value ) );
            }
            else if( !(value == null
                    || value instanceof String
                    || value instanceof Integer
                    || value instanceof BigDecimal
                    || value instanceof Date
                    || value instanceof Byte
                    || value instanceof Double
                    || value instanceof Float
                    || value instanceof Long
                    || value instanceof Short
                    || value instanceof Boolean
                    || value instanceof byte[]
                    || value instanceof List
                    || value instanceof Object[]) )
            {
                // Not one of the remaining valid types then remove it
                it.remove();
            }
        }
    }

    return m;
}
 

import com.rabbitmq.client.LongString; //导入依赖的package包/类
public static Map getTransportHeaders(RabbitMQMessage message) {
    Map<String, String> map = new HashMap<String, String>();

    // correlation ID
    if (message.getCorrelationId() != null) {
        map.put(RabbitMQConstants.CORRELATION_ID, message.getCorrelationId());
    }

    // if a AMQP message ID is found
    if (message.getMessageId() != null) {
        map.put(RabbitMQConstants.MESSAGE_ID, message.getMessageId());
    }

    // replyto destination name
    if (message.getReplyTo() != null) {
        String dest = message.getReplyTo();
        map.put(RabbitMQConstants.RABBITMQ_REPLY_TO, dest);
    }

    // any other transport properties / headers
    Map<String, Object> headers = message.getHeaders();
    if (headers != null && !headers.isEmpty()) {
        for (String headerName : headers.keySet()) {
            String value = new String(((LongString)(headers.get(headerName))).getBytes());
            map.put(headerName, value);
        }
    }

    return map;
}