基于google的这个jar实现
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Component;
import com.amarsoft.hub.api.model.AccountInfo;
import com.amarsoft.logmonitor.common.Constants;
import com.amarsoft.logmonitor.utils.LogMonitorUtils;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
@Component
public class AccountInfoCache {
private final Logger LOGGER = LoggerFactory.getLogger(AccountInfoCache.class);
private LoadingCache<String, AccountInfo> accountInfoCache;
@Autowired
@Qualifier("accountJdbcTemplate")
private JdbcTemplate readJdbcTemplate;
@PostConstruct
public void init() {
accountInfoCache = CacheBuilder.newBuilder()
.expireAfterWrite(1, TimeUnit.DAYS)//这句话的意思可能是每查一次缓存持续的时间为1天
.build(new CacheLoader<String, AccountInfo>() {
@Override
public AccountInfo load(String bankId) throws Exception {
AccountInfo accountInfo = loadByBankId(bankId);
return accountInfo == null ? new AccountInfo() : accountInfo;
}
});
//加载全部帐号信息
List<AccountInfo> accountInfos = loadAll();
if (accountInfos != null && accountInfos.size() > 0) {
LOGGER.info("初始化帐号信息到缓存中");
accountInfos.stream().forEach(accountInfo -> accountInfoCache.put(accountInfo.getBankId(), accountInfo));
}
}
public String getCustomerName(String bankId) {
try {
return accountInfoCache.get(bankId).getName();
} catch (Exception e) {
LOGGER.error("根据bankId="+bankId+"获取名字时出现差异",e);
LOGGER.info(LogMonitorUtils.putMonitorMsg(Constants.LOG_LEVEL_ERROR, "根据bankId="+bankId+"获取名字时出现差异", e.getMessage()));
return "";
}
}
private List<AccountInfo> loadAll() {
String sql = "select bankId,name from customer";
LOGGER.info("SQL:{}",sql);
return readJdbcTemplate.query(sql, new AccountInfoRowMapper());
}
private AccountInfo loadByBankId(String bankId) {
String sql = "select bankId,name from customer where bankId = ?";
LOGGER.info("SQL:{}",sql);
List<AccountInfo> records = readJdbcTemplate.query(sql, new AccountInfoRowMapper(),bankId);
return records == null || records.isEmpty() ? null : records.get(0);
}
private class AccountInfoRowMapper implements RowMapper<AccountInfo> {
@Override
public AccountInfo mapRow(ResultSet rs, int rowNum) throws SQLException {
AccountInfo accountInfo = new AccountInfo();
accountInfo.setBankId(rs.getString("bankId"));
accountInfo.setName(rs.getString("name"));
return accountInfo;
}
}
}
最终的调用方式:
@Autowired
private AccountInfoCache accountInfoCache;
String accountDescribe = accountInfoCache.getCustomerName(accountId);