net.kuujo.vertigo.instance.impl.InputPortImpl.java Source code

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Here is the source code for net.kuujo.vertigo.instance.impl.InputPortImpl.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.instance.impl;

import io.vertx.core.Handler;
import io.vertx.core.Vertx;
import io.vertx.core.eventbus.Message;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import net.kuujo.vertigo.spi.ComponentInstanceFactory;
import net.kuujo.vertigo.instance.ControllableInput;
import net.kuujo.vertigo.message.VertigoMessage;
import net.kuujo.vertigo.instance.InputConnection;
import net.kuujo.vertigo.context.InputConnectionContext;
import net.kuujo.vertigo.instance.InputPort;
import net.kuujo.vertigo.context.InputPortContext;
import net.kuujo.vertigo.util.TaskRunner;

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

/**
 * Input port implementation.
 *
 * @author <a href="http://github.com/kuujo">Jordan Halterman</a>
 */
public class InputPortImpl<T> implements InputPort<T>, ControllableInput<InputPort<T>, T>, Handler<Message<T>> {

    protected static final String ID_HEADER = "name";

    private static final Logger log = LoggerFactory.getLogger(InputPortImpl.class);
    protected final Vertx vertx;
    protected InputPortContext context;
    protected final Map<String, InputConnection<T>> connections = new HashMap<>();
    private final TaskRunner tasks = new TaskRunner();
    @SuppressWarnings("rawtypes")
    private Handler<VertigoMessage<T>> messageHandler;
    private boolean open;
    private boolean paused;
    private InputConnection<T> stubConnection;

    public InputPortImpl(Vertx vertx, InputPortContext context, ComponentInstanceFactory factory) {
        this.vertx = vertx;
        this.context = context;
        init(factory);
    }

    /**
     * Initializes the output connections.
     * @param factory
     */
    private void init(ComponentInstanceFactory factory) {
        for (InputConnectionContext connection : context.connections()) {
            connections.put(connection.target().address(), factory.<T>createInputConnection(vertx, connection));
        }
        stubConnection = factory.<T>createExternalInputConnection(vertx, context);
    }

    @Override
    public String name() {
        return context.name();
    }

    @Override
    public InputPort<T> checkpoint() {
        return this;
    }

    @Override
    public InputPort<T> replay() {
        return this;
    }

    @Override
    public void handle(Message<T> message) {
        String source = message.headers().get("source");
        if (source != null) {
            InputConnection<T> connection = connections.get(source);
            if (connection != null) {
                connection.handle(message);
            }
        } else {
            if (stubConnection != null) {
                stubConnection.handle(message);
            }
        }
    }

    @Override
    public InputPort<T> pause() {
        paused = true;
        for (InputConnection connection : connections.values()) {
            connection.pause();
        }
        return this;
    }

    @Override
    public InputPort<T> resume() {
        paused = false;
        for (InputConnection connection : connections.values()) {
            connection.resume();
        }
        return this;
    }

    @Override
    public InputPort<T> handler(final Handler<VertigoMessage<T>> handler) {
        if (open && handler == null) {
            throw new IllegalStateException("cannot unset handler on locked port");
        }
        this.messageHandler = handler;
        for (InputConnection<T> connection : connections.values()) {
            connection.handler(messageHandler);
        }
        stubConnection.handler(handler);
        return this;
    }

    @Override
    public String toString() {
        return context.toString();
    }

}