RiemannTcpClient.java

/*

 Copyright 2012 David Rusek

 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 org.robotninjas.riemann.client;

import com.google.common.base.Optional;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.ChannelFuture;

import javax.annotation.concurrent.ThreadSafe;
import javax.inject.Inject;
import java.net.InetSocketAddress;

import static com.google.common.base.Throwables.propagate;
import static com.google.common.base.Throwables.propagateIfInstanceOf;

@ThreadSafe
public class RiemannTcpClient implements RiemannClient {

  private static final int DEFAULT_RETRIES = 0;
  private static final long DEFAULT_SLEEP_BETWEEN_RETRIES = 0;

    private final ClientBootstrap bootstrap;
  private volatile int maxRetries = DEFAULT_RETRIES;
  private long sleepBetweenRetries = DEFAULT_SLEEP_BETWEEN_RETRIES;

    @Inject
  public RiemannTcpClient(ClientBootstrap bootstrap) {
    this.bootstrap = bootstrap;
  }

  public int getMaxRetries() {
    return maxRetries;
  }

  public void setMaxRetries(int maxRetries) {
    this.maxRetries = maxRetries;
  }

  public void setSleepBetweenRetriesMilliseconds(long sleepBetweenRetries) {
    this.sleepBetweenRetries = sleepBetweenRetries;
  }

  @Override
  public RiemannTcpConnection makeConnection(String address, int port) throws InterruptedException {

    Optional<Exception> lastException = Optional.absent();
    for (int i = 0; i <= maxRetries; ++i) {
      try {
        final ChannelFuture channelFuture = bootstrap.connect(new InetSocketAddress(address, port));
        channelFuture.sync();
        return new RiemannTcpConnection(channelFuture.getChannel(), bootstrap);
      } catch (Exception e) {
        propagateIfInstanceOf(e, InterruptedException.class);
        lastException = Optional.of(e);
      }
    }

    if (lastException.isPresent()) {
      throw propagate(lastException.get());
    }

    return null;
  }

  @Override
  public RiemannTcpConnection makeConnection(String address) throws InterruptedException {
    return makeConnection(address, DEFAULT_PORT);
  }

  @Override
  public RiemannTcpConnection makeConnection() throws InterruptedException {

    Optional<Exception> lastException = Optional.absent();
    for (int i = 0; i <= maxRetries; ++i) {
      try {
        final ChannelFuture channelFuture = bootstrap.connect();
        channelFuture.sync();
        return new RiemannTcpConnection(channelFuture.getChannel(), bootstrap);
      } catch (Exception e) {
        propagateIfInstanceOf(e, InterruptedException.class);
        lastException = Optional.of(e);
        if (i < maxRetries) {
            Thread.sleep(sleepBetweenRetries);
        }
      }
    }

    if (lastException.isPresent()) {
      throw propagate(lastException.get());
    }

    return null;
  }

  @Override
  public void shutdown() {
    bootstrap.releaseExternalResources();
    bootstrap.shutdown();
  }
}