com.urbanairship.connect.client.RawEventReceiver Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of connect-client Show documentation

The UA Connect Java client library

There is a newer version: 5.4.2

/*
Copyright 2015 Urban Airship and Contributors
*/

package com.urbanairship.connect.client;

import com.google.common.base.Supplier;
import com.google.gson.Gson;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSyntaxException;
import com.urbanairship.connect.client.model.GsonUtil;
import com.urbanairship.connect.client.model.responses.Event;
import com.urbanairship.connect.java8.Consumer;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import java.util.concurrent.atomic.AtomicReference;

/**
 * Class that consumes and parses the API response while tracking the stream offset.
 */
public class RawEventReceiver implements Consumer, Supplier {

    private static final Logger log = LogManager.getLogger(RawEventReceiver.class);

    private static final Gson gson = GsonUtil.getGson();
    private AtomicReference lastOffset = new AtomicReference<>("0");
    private final Consumer consumer;

    /**
     * Default constructor
     *
     * @param consumer {@code Consumer} Implemented by a library user to consume response POJOs.
     */
    public RawEventReceiver(Consumer consumer) {
        this.consumer = consumer;
    }

    /**
     * Accepts an API response entry and parses it into an {@link com.urbanairship.connect.client.model.responses.Event}.
     * The offset is then retrieved from the parsed response, which then gets passed into the Event consumer.
     *
     * @param event String a single event from the API response.
     */
    @Override
    public void accept(String event) {
        try {
            Event eventObj = gson.fromJson(event, Event.class);
            log.debug("Parsing event " + eventObj.getIdentifier());

            lastOffset.set(eventObj.getOffset());
            consumer.accept(eventObj);
        } catch (JsonSyntaxException e) {
            log.warn("Error parsing  " + event, e);
        } catch (JsonParseException e) {
            log.warn("Error parsing " + event, e);
        }
    }

    /**
     * Gets the last stream offset.
     *
     * @return offset
     */
    @Override
    public String get() {
        return lastOffset.get();
    }

}