WebsocketClient.java

/*
 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you 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 org.wso2.carbon.event.input.adapter.websocket.internal;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.context.PrivilegedCarbonContext;
import org.wso2.carbon.event.input.adapter.core.InputEventAdapterListener;

import javax.websocket.Endpoint;
import javax.websocket.EndpointConfig;
import javax.websocket.MessageHandler;
import javax.websocket.Session;
import java.io.IOException;

/**
 * An instance of this class is used, when we connect to a user-given socket-server, as a client - to send events.
 */
public class WebsocketClient extends Endpoint {

    private static final Log log = LogFactory.getLog(WebsocketClient.class);
    private InputEventAdapterListener inputEventAdapterListener;
    private int tenantId;

    public WebsocketClient(InputEventAdapterListener inputEventAdapterListener, int tenantId) {
        this.inputEventAdapterListener = inputEventAdapterListener;
        this.tenantId = tenantId;
    }

    @Override
    public void onOpen(Session session, EndpointConfig endpointConfig) {
        session.addMessageHandler(new MessageHandler.Whole<String>() {
            @Override
            public void onMessage(String message) {
                PrivilegedCarbonContext.startTenantFlow();
                PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantId(tenantId);
                    if (log.isDebugEnabled()){
                        log.debug("Received message: '" + message);
                    }
                    inputEventAdapterListener.onEvent(message);
                PrivilegedCarbonContext.endTenantFlow();
            }
        });
    }

    @Override
    public void onClose(Session session, javax.websocket.CloseReason closeReason) {
        if (log.isDebugEnabled()){
            log.debug("Input ws-adaptor: WebsocketClient Endpoint closed: "+closeReason.toString()+"for request URI - "+session.getRequestURI());
        }
        try {
            session.close();
        } catch (IOException e) {
            log.error("Error occurred during closing session. Session ID:"+session.getId()+", for request URI - "+session.getRequestURI()+", Reason: "+e.getMessage(), e);
        }
    }


    @Override
    public void onError(Session session, Throwable thr) {
        log.error("Error occurred during session ID:"+session.getId()+", for request URI - "+session.getRequestURI()+", Reason: "+thr, thr);
        try {
            session.close();
        } catch (IOException e) {
            log.error("Error occurred during closing session. Session ID:"+session.getId()+", for request URI - "+session.getRequestURI()+", Reason: "+e.getMessage(), e);
        }
    }

}