shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/communication/jdbc/connection/BackendConnection.java
/**
     * Close federation executor.
     * 
     * @return SQL exception when federation executor close
     */
Close federation executor.

@return SQL exception when federation executor close
Close federation executor . @return SQL exception when federation executor close
public synchronized Collection<SQLException> closeFederationExecutor() {
        Collection<SQLException> result = new LinkedList<>();
        if (null != federationExecutor) {
            try {
                federationExecutor.close();
            } catch (final SQLException ex) {
                result.add(ex);
            }
        }
        return result;
    }
public synchronized Collection < SQLException > closeFederationExecutor ( ) { Collection < SQLException > result = new LinkedList < > ( ) ; if ( null != federationExecutor ) { try { federationExecutor . close ( ) ; } catch ( final SQLException ex ) { result . add ( ex ) ; } } return result ; }
Close federation executor.
Close federation executor .