net.kuujo.vertigo.io.selector.CustomSelector.java Source code

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Here is the source code for net.kuujo.vertigo.io.selector.CustomSelector.java

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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 net.kuujo.vertigo.io.selector;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.kuujo.vertigo.io.connection.Connection;
import net.kuujo.vertigo.util.serialization.SerializerFactory;

import org.vertx.java.core.json.JsonObject;

import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;

/**
 * Custom selector wrapper.<p>
 *
 * This class is used only internally by Vertigo to handle custom connection
 * selectors. To implement a custom selector, simply extend the base
 * {@link Selector} class.
 *
 * @author <a href="http://github.com/kuujo">Jordan Halterman</a>
 */
public class CustomSelector implements Selector {
    private Map<String, Object> properties = new HashMap<>();
    private boolean initialized;
    private Selector selector;

    public CustomSelector() {
    }

    public CustomSelector(Selector selector) {
        this.selector = selector;
    }

    @JsonAnyGetter
    private Map<String, Object> getProperties() {
        if (selector != null) {
            properties = SerializerFactory.getSerializer(selector.getClass()).serializeToObject(selector).toMap();
        }
        return properties;
    }

    @JsonAnySetter
    private void setProperty(String name, Object value) {
        properties.put(name, value);
    }

    private void init() {
        if (!initialized) {
            String className = (String) properties.get("selector");
            if (className != null) {
                ClassLoader loader = Thread.currentThread().getContextClassLoader();
                try {
                    Class<?> clazz = loader.loadClass(className);
                    selector = (Selector) SerializerFactory.getSerializer(clazz)
                            .deserializeObject(new JsonObject(properties), clazz);
                } catch (Exception e) {
                    throw new IllegalArgumentException("Error instantiating serializer factory.");
                }
            } else {
                throw new IllegalStateException("Not a valid custom serializer.");
            }
        }
    }

    @Override
    @SuppressWarnings("rawtypes")
    public <T extends Connection> List<T> select(Object message, List<T> connections) {
        init();
        return selector.select(message, connections);
    }

}