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Jaeger Java bindings for OpenTracing API

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/*
 * Copyright (c) 2016, Uber Technologies, Inc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.uber.jaeger.senders;

import com.twitter.zipkin.thriftjava.Span;
import com.uber.jaeger.exceptions.SenderException;

import java.util.ArrayList;
import java.util.List;

public class InMemorySender implements Sender {
  private List appended;
  private List flushed;
  private List received;

  public InMemorySender() {
    appended = new ArrayList<>();
    flushed = new ArrayList<>();
    received = new ArrayList<>();
  }

  public List getAppended() {
    return new ArrayList<>(appended);
  }

  public List getFlushed() {
    return new ArrayList<>(flushed);
  }

  public List getReceived() {
    return new ArrayList<>(received);
  }

  @Override
  public int append(Span span) throws SenderException {
    appended.add(span);
    received.add(span);
    return 0;
  }

  @Override
  public int flush() throws SenderException {
    int flushedSpans = appended.size();
    flushed.addAll(appended);
    appended.clear();

    return flushedSpans;
  }

  @Override
  public int close() throws SenderException {
    return flush();
  }
}