fix协议介绍6-重发消息

FIX.5.0SP2 Message

ResendRequest [type '2']

The resend request is sent by the receiving application to initiate the retransmission of messages. This function is utilized if a sequence number gap is detected, if the receiving application lost a message, or as a function of the initialization process.

重发消息实现：

package cs.mina.codec.msg;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import cs.mina.exception.InValidDataException;

/*
 *@author(huangxiaoping)
 *@date 2013-11-28
 */
public class ResendRequestMsg extends BaseMsg {
  private Tag beginSeqNo = new Tag("7", "SeqNum", true);
  private Tag endSeqNo = new Tag("16", "SeqNum", true);

  private Set<String> tagIdsSet = new HashSet<String>();

  public ResendRequestMsg() {
    this.getHeadEntity().getMsgType().setTagValue("2");
    tagIdsSet.add("7");
    tagIdsSet.add("16");
    this.getBodyEntity().getBodyTagList().add(beginSeqNo);
    this.getBodyEntity().getBodyTagList().add(endSeqNo);
  }

  @Override
  public void decodeBody() {
    Set<String> already=new HashSet<String>();
    String[] bodyItems=this.body.split(BaseMsg.SOH);
    if(bodyItems.length==1&&bodyItems[0].equals("")){
      return;
    }
    for(int i=0;i<bodyItems.length;i++){
      String[]tagItems=bodyItems[i].split("=");
      if(tagItems.length!=2){
        throw new InValidDataException("消息格式错误");
      }
      String tagId=tagItems[0];
      if(already.contains(tagId)){
        throw new InValidDataException("消息格式错误");
      }
      already.add(tagId);
      if(this.tagIdsSet.contains(tagId)){
          List<Tag> tagList=this.bodyEntity.getBodyTagList();
          for(int j=0;j<tagList.size();j++){
            Tag tag=tagList.get(j);
            if(tag.getTagId().equals(tagId)){
              tag.setTagValue(tagItems[1]);
              break;
            }
          }
      }else{
        throw new InValidDataException("消息格式错误,"+tagId+"不在消息体内");
      }
    }
  }

  @Override
  public void validate() {
    this.headEntity.validate();
    List<Tag> bodyTagList=this.bodyEntity.getBodyTagList();
    for(int i=0;i<bodyTagList.size();i++){
      bodyTagList.get(i).validate();
    }
    this.tailerEntity.validate();
  }

  public Tag getBeginSeqNo() {
    return beginSeqNo;
  }

  public void setBeginSeqNo(Tag beginSeqNo) {
    this.beginSeqNo = beginSeqNo;
  }

  public Tag getEndSeqNo() {
    return endSeqNo;
  }

  public void setEndSeqNo(Tag endSeqNo) {
    this.endSeqNo = endSeqNo;
  }

  public Set<String> getTagIdsSet() {
    return tagIdsSet;
  }

  public void setTagIdsSet(Set<String> tagIdsSet) {
    this.tagIdsSet = tagIdsSet;
  }

}

处理逻辑：略