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Java client driver for SequoiaDB
/*
* Copyright 2018 SequoiaDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sequoiadb.base;
import com.sequoiadb.exception.BaseException;
import com.sequoiadb.exception.SDBError;
import com.sequoiadb.message.request.AdminRequest;
import com.sequoiadb.message.response.SdbReply;
import org.bson.BSONObject;
import org.bson.BasicBSONObject;
/**
* Node of SequoiaDB.
*/
public class Node {
private String hostName;
private int port;
private String nodeName;
private int id;
private ReplicaGroup rg;
private Sequoiadb sequoiadb;
Node(String hostName, int port, int nodeId, ReplicaGroup rg) {
this.rg = rg;
this.hostName = hostName;
this.port = port;
this.nodeName = hostName + ":" + port;
this.id = nodeId;
}
/**
* Node status.
*/
public enum NodeStatus {
SDB_NODE_ALL(1),
SDB_NODE_ACTIVE(2),
SDB_NODE_INACTIVE(3),
SDB_NODE_UNKNOWN(4);
private final int key;
NodeStatus(int key) {
this.key = key;
}
public int getKey() {
return key;
}
public static NodeStatus getByKey(int key) {
NodeStatus nodeStatus = NodeStatus.SDB_NODE_ALL;
for (NodeStatus status : NodeStatus.values()) {
if (status.getKey() == key) {
nodeStatus = status;
break;
}
}
return nodeStatus;
}
}
/**
* @return Current node's id.
*/
public int getNodeId() {
return id;
}
/**
* @return Current node's parent replica group.
*/
public ReplicaGroup getReplicaGroup() {
return rg;
}
/**
* Disconnect from current node.
*
* @throws BaseException If error happens.
*/
public void disconnect() throws BaseException {
sequoiadb.disconnect();
}
/**
* Connect to current node with the same username and password of coordination node.
*
* @return The Sequoiadb instance of current node.
* @throws BaseException If error happens.
* @deprecated This function is deprecated
*/
@Deprecated
public Sequoiadb connect() throws BaseException {
if (sequoiadb != null && !sequoiadb.isClosed()) {
sequoiadb.close();
}
sequoiadb = new Sequoiadb(hostName, port, rg.getSequoiadb().getUserName(),
rg.getSequoiadb().getPassword());
return sequoiadb;
}
/**
* Connect to current node with username and password.
*
* @param username user name
* @param password pass word
* @return The Sequoiadb instance of current node.
* @throws BaseException If error happens.
* @deprecated This function is deprecated
*/
@Deprecated
public Sequoiadb connect(String username, String password) throws BaseException {
if (sequoiadb != null && !sequoiadb.isClosed()) {
sequoiadb.close();
}
sequoiadb = new Sequoiadb(hostName, port, username, password);
return sequoiadb;
}
/**
* Get the Sequoiadb of current node.
*
* @return The Sequoiadb object of current node or null for having not
* connected to the current node yet.
* @see Node#connect()
* @see Node#connect(String, String)
*/
public Sequoiadb getSdb() {
return sequoiadb;
}
/**
* Get the hostname of current node.
*
* @return Hostname of current node.
*/
public String getHostName() {
return hostName;
}
/**
* Get the port of current node.
*
* @return The port of current node.
*/
public int getPort() {
return port;
}
/**
* Get the name of current node.
*
* @return The name of current node.
*/
public String getNodeName() {
return nodeName;
}
/**
* Get the status of current node.
*
* @return The status of current node.
* @throws BaseException If error happens.
* @deprecated The status of node are invalid, never use this api again.
*/
public NodeStatus getStatus() throws BaseException {
BSONObject obj = new BasicBSONObject();
obj.put(SdbConstants.FIELD_NAME_GROUPID, rg.getId());
obj.put(SdbConstants.FIELD_NAME_NODEID, id);
AdminRequest request = new AdminRequest(AdminCommand.SNAP_DATABASE, obj);
SdbReply response = rg.getSequoiadb().requestAndResponse(request);
int flag = response.getFlag();
if (flag != 0) {
if (flag == SDBError.SDB_NET_CANNOT_CONNECT.getErrorCode()) {
return NodeStatus.SDB_NODE_INACTIVE;
} else {
rg.getSequoiadb().throwIfError(response);
}
}
return NodeStatus.SDB_NODE_ACTIVE;
}
/**
* Start current node.
*
* @throws BaseException If error happens.
*/
public void start() throws BaseException {
startStop(true);
}
/**
* Stop current node.
*
* @throws BaseException If error happens.
*/
public void stop() throws BaseException {
startStop(false);
}
private void startStop(boolean start) {
BSONObject config = new BasicBSONObject();
config.put(SdbConstants.FIELD_NAME_HOST, hostName);
config.put(SdbConstants.PMD_OPTION_SVCNAME, Integer.toString(port));
String cmd = start ? AdminCommand.STARTUP_NODE : AdminCommand.SHUTDOWN_NODE;
AdminRequest request = new AdminRequest(cmd, config);
SdbReply response = rg.getSequoiadb().requestAndResponse(request);
String msg = "node = " + hostName + ":" + port;
rg.getSequoiadb().throwIfError(response, msg);
}
}