AppUiMessageHandler.java

#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
/*
 * Copyright ${year}-present Open Networking Laboratory
 *
 * 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 ${package};

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;

/**
 * Skeletal ONOS UI Custom-View message handler.
 */
public class AppUiMessageHandler extends UiMessageHandler {

    private static final String SAMPLE_CUSTOM_DATA_REQ = "sampleCustomDataRequest";
    private static final String SAMPLE_CUSTOM_DATA_RESP = "sampleCustomDataResponse";

    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 incrememt 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 SampleCustomDataRequestHandler()
        );
    }

    // handler for sample data requests
    private final class SampleCustomDataRequestHandler extends RequestHandler {

        private SampleCustomDataRequestHandler() {
            super(SAMPLE_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(SAMPLE_CUSTOM_DATA_RESP, result);
        }
    }
}