Example #1
0
 private void putRecord(MetaRecord rec, long ts) throws Exception {
   Put put = new Put(Bytes.toBytes(rec.getId()));
   put.add(FAMILY, OBJECT_TYPE, ts, Bytes.toBytes(rec.getObjectType()));
   put.add(FAMILY, SQL, ts, Bytes.toBytes(rec.getSQL()));
   // System.out.println("addRecord id: " + rec.getId() + ", sql=" + rec.getSQL());
   table.put(put);
 }
Example #2
0
 public void updateRecord(MetaRecord rec) {
   try {
     long ts = System.currentTimeMillis();
     putRecord(rec, ts);
     String node = ZKUtil.joinZNode(H2MetaTableTracker.NODE_NAME, Integer.toString(rec.getId()));
     // setData会异步触发所有机器(包括本机)上的H2MetaTableTracker.nodeDataChanged
     // 然后触发下列调用:
     // =>org.h2.engine.Database.updateDatabaseObject(int)
     //  =>org.h2.engine.Database.update(Session, DbObject)
     //      =>org.h2.engine.Database.addMeta0(Session, DbObject, boolean)
     //          =>又到此方法
     // 所以会造成循环
     synchronized (this) { // 避免setData后立刻触发nodeDataChanged,此时IdVersion还未更新
       ZKUtil.setData(watcher, node, Bytes.toBytes(ts));
       // setData后watch不见了,所以要继续watch,监听其他人对此node的修改
       // ZKUtil.watchAndCheckExists(watcher, node);
       Stat stat = new Stat();
       ZKUtil.getDataAndWatch(watcher, node, stat);
       // 这里记录下id的最新版本,触发nodeDataChanged时再检查一下是否版本一样,
       // 如果不大于这里的版本那么就不再执行updateDatabaseObject操作
       tracker.updateIdVersion(rec.getId(), stat.getVersion());
     }
   } catch (Exception e) {
     throw new RuntimeException(e);
   }
 }
Example #3
0
 public void addRecord(MetaRecord rec) {
   try {
     putRecord(rec, System.currentTimeMillis());
     String node = ZKUtil.joinZNode(H2MetaTableTracker.NODE_NAME, Integer.toString(rec.getId()));
     ZKUtil.createAndWatch(watcher, node, EMPTY_BYTE_ARRAY);
     tracker.updateIdVersion(rec.getId(), 0);
   } catch (Exception e) {
     throw new RuntimeException(e);
   }
 }
Example #4
0
  public void loadMetaRecords(List<MetaRecord> records) throws Exception {
    MetaRecord rec;
    for (Result r : table.getScanner(new Scan())) {
      if (r.isEmpty()) continue;
      rec = getMetaRecord(r);
      records.add(rec);

      if (!tracker.contains(rec.getId()))
        ZKUtil.createNodeIfNotExistsAndWatch(
            watcher,
            ZKUtil.joinZNode(H2MetaTableTracker.NODE_NAME, Integer.toString(rec.getId())),
            EMPTY_BYTE_ARRAY);
    }
  }