org.apache.camel.component.yammer.YammerMessagePollingConsumer Maven / Gradle / Ivy

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Camel Yammer Component
There is a newer version: 3.16.0
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.camel.component.yammer;

import java.util.concurrent.TimeUnit;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.component.yammer.model.Messages;
import org.apache.camel.support.ScheduledPollConsumer;
import org.apache.camel.util.ObjectHelper;

/**
 * A Yammer consumer that periodically polls messages from Yammer's message API.
 */
public class YammerMessagePollingConsumer extends ScheduledPollConsumer {
    private final YammerEndpoint endpoint;
    private final String apiUrl;
    private ApiRequestor requestor;

    public YammerMessagePollingConsumer(YammerEndpoint endpoint, Processor processor) throws Exception {
        super(endpoint, processor);
        this.endpoint = endpoint;

        long delay = endpoint.getConfig().getDelay();
        setDelay(delay);
        setTimeUnit(TimeUnit.MILLISECONDS);
        apiUrl = getApiUrl();
    }

    private String getApiUrl() throws Exception {
        StringBuilder url = new StringBuilder();

        switch (endpoint.getConfig().getFunction()) {
            case MESSAGES:
                url.append(YammerConstants.YAMMER_BASE_API_URL);
                url.append(endpoint.getConfig().getFunction().name().toLowerCase());
                url.append(".json");
                break;
            case ALGO:
            case FOLLOWING:
            case MY_FEED:
            case PRIVATE:
            case SENT:
            case RECEIVED:
                url.append(YammerConstants.YAMMER_BASE_API_URL);
                url.append("messages/");
                url.append(endpoint.getConfig().getFunction().name().toLowerCase());
                url.append(".json");
                break;
            default:
                throw new Exception(
                        String.format("%s is not a valid Yammer message function type.",
                                endpoint.getConfig().getFunction().name()));
        }

        StringBuilder args = new StringBuilder();

        int limit = endpoint.getConfig().getLimit();
        if (limit > 0) {
            args.append("limit=");
            args.append(limit);
        }

        long olderThan = endpoint.getConfig().getOlderThan();
        if (olderThan > 0) {
            if (args.length() > 0) {
                args.append("&");
            }
            args.append("older_than=");
            args.append(olderThan);
        }

        long newerThan = endpoint.getConfig().getNewerThan();
        if (newerThan > 0) {
            if (args.length() > 0) {
                args.append("&");
            }
            args.append("newer_than=");
            args.append(newerThan);
        }

        String threaded = endpoint.getConfig().getThreaded();
        if (ObjectHelper.isNotEmpty(threaded)
                && ("true".equals(threaded) || "extended".equals(threaded))) {
            if (args.length() > 0) {
                args.append("&");
            }
            args.append("threaded=");
            args.append(threaded);
        }

        if (args.length() > 0) {
            url.append("?");
            url.append(args);
        }

        return url.toString();
    }

    @Override
    protected int poll() throws Exception {
        Exchange exchange = createExchange(false);

        try {
            String jsonBody = requestor.get();

            if (!endpoint.getConfig().isUseJson()) {
                ObjectMapper jsonMapper = new ObjectMapper();
                Messages messages = jsonMapper.readValue(jsonBody, Messages.class);
                exchange.getIn().setBody(messages);
            } else {
                exchange.getIn().setBody(jsonBody);
            }

            // send message to next processor in the route
            getProcessor().process(exchange);

            return 1; // number of messages polled
        } finally {
            // log exception if an exception occurred and was not handled
            if (exchange.getException() != null) {
                getExceptionHandler().handleException("Error processing exchange", exchange, exchange.getException());
            }
            releaseExchange(exchange, false);
        }
    }

    @Override
    protected void doStart() throws Exception {
        super.doStart();
        if (requestor == null) {
            requestor = endpoint.getConfig().getRequestor();
        }
        if (requestor == null) {
            requestor = new ScribeApiRequestor(apiUrl, endpoint.getConfig().getAccessToken());
        }
    }
}