uiref/src/main/java/org/onosproject/uiref/UiRefCustomViewMessageHandler.java

/*
 * Copyright 2015 Open Networking Foundation
 *
 * 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 org.onosproject.uiref;

import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.common.collect.ImmutableSet;
import org.onosproject.ui.RequestHandler;
import org.onosproject.ui.UiMessageHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Collection;

/**
 * Message handler for UI Ref custom-view.
 */
public class UiRefCustomViewMessageHandler extends UiMessageHandler {

    private static final String UI_REF_CUSTOM_DATA_REQ = "uiRefCustomDataRequest";
    private static final String UI_REF_CUSTOM_DATA_RESP = "uiRefCustomDataResponse";

    private static final String NUMBER = "number";
    private static final String SQUARE = "square";
    private static final String CUBE = "cube";
    private static final String MESSAGE = "message";
    private static final String MSG_FORMAT = "Next increment is %d units";

    private final Logger log = LoggerFactory.getLogger(getClass());

    private long someNumber = 1;
    private long someIncrement = 1;

    @Override
    protected Collection<RequestHandler> createRequestHandlers() {
        return ImmutableSet.of(
                new UiRefCustomDataRequestHandler()
        );
    }

    // handler for custom-view data requests
    private final class UiRefCustomDataRequestHandler extends RequestHandler {

        private UiRefCustomDataRequestHandler() {
            super(UI_REF_CUSTOM_DATA_REQ);
        }

        @Override
        public void process(ObjectNode payload) {
            someIncrement++;
            someNumber += someIncrement;
            log.debug("Computing data for {}...", someNumber);

            ObjectNode result = objectNode();
            result.put(NUMBER, someNumber);
            result.put(SQUARE, someNumber * someNumber);
            result.put(CUBE, someNumber * someNumber * someNumber);
            result.put(MESSAGE, String.format(MSG_FORMAT, someIncrement + 1));
            sendMessage(UI_REF_CUSTOM_DATA_RESP, result);
        }
    }
}