红帽全球峰会270.7.2. 为 Producers 实施 InOut Exchanges
对于制作者，发送消息将阻止，直到收到回复或超时。在修复中，没有标准的方式来关联回复消息。因此，必须为每种类型的 InOut 交换定义关联条件。可使用 Exchange 属性指定关联条件和超时。
| 描述 | Key String | key Constant | 默认 |
|---|---|---|---|
| 关联标准 | "CorrelationCriteria" | QuickfixjProducer.CORRELATION_CRITERIA_KEY | 无 |
| Milliseconds 中的关联超时 | "CorrelationTimeout" | QuickfixjProducer.CORRELATION_TIMEOUT_KEY | 1000 |
correlation 条件通过 MessagePredicate 对象定义。以下示例将来自指定会话的 FIX ExecutionReport，其中事务类型是 STATUS，Order ID 将与我们的请求匹配。会话 ID 应为 requestor，当查找回复时，发件人和目标 CompID 字段将被反向。
exchange.setProperty(QuickfixjProducer.CORRELATION_CRITERIA_KEY,
new MessagePredicate(new SessionID(sessionID), MsgType.EXECUTION_REPORT)
.withField(ExecTransType.FIELD, Integer.toString(ExecTransType.STATUS))
.withField(OrderID.FIELD, request.getString(OrderID.FIELD)));
exchange.setProperty(QuickfixjProducer.CORRELATION_CRITERIA_KEY,
new MessagePredicate(new SessionID(sessionID), MsgType.EXECUTION_REPORT)
.withField(ExecTransType.FIELD, Integer.toString(ExecTransType.STATUS))
.withField(OrderID.FIELD, request.getString(OrderID.FIELD)));
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