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/*
 * Copyright 2019, OpenTelemetry 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 io.opentelemetry.sdk.trace;

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

/**
 * Implementation of the {@code SpanProcessor} that simply forwards all received events to a list of
 * {@code SpanProcessor}s.
 */
public final class MultiSpanProcessor implements SpanProcessor {
  private final List spanProcessorsStart;
  private final List spanProcessorsEnd;
  private final List spanProcessorsAll;

  /**
   * Creates a new {@code MultiSpanProcessor}.
   *
   * @param spanProcessorList the {@code List} of {@code SpanProcessor}s.
   * @return a new {@code MultiSpanProcessor}.
   * @throws NullPointerException if the {@code spanProcessorList} is {@code null}.
   */
  public static SpanProcessor create(List spanProcessorList) {
    return new MultiSpanProcessor(
        new ArrayList<>(Objects.requireNonNull(spanProcessorList, "spanProcessorList")));
  }

  @Override
  public void onStart(ReadableSpan readableSpan) {
    for (SpanProcessor spanProcessor : spanProcessorsStart) {
      spanProcessor.onStart(readableSpan);
    }
  }

  @Override
  public boolean isStartRequired() {
    return !spanProcessorsStart.isEmpty();
  }

  @Override
  public void onEnd(ReadableSpan readableSpan) {
    for (SpanProcessor spanProcessor : spanProcessorsEnd) {
      spanProcessor.onEnd(readableSpan);
    }
  }

  @Override
  public boolean isEndRequired() {
    return !spanProcessorsEnd.isEmpty();
  }

  @Override
  public void shutdown() {
    for (SpanProcessor spanProcessor : spanProcessorsAll) {
      spanProcessor.shutdown();
    }
  }

  @Override
  public void forceFlush() {
    for (SpanProcessor spanProcessor : spanProcessorsAll) {
      spanProcessor.forceFlush();
    }
  }

  private MultiSpanProcessor(List spanProcessors) {
    this.spanProcessorsAll = spanProcessors;
    this.spanProcessorsStart = new ArrayList<>(spanProcessorsAll.size());
    this.spanProcessorsEnd = new ArrayList<>(spanProcessorsAll.size());
    for (SpanProcessor spanProcessor : spanProcessorsAll) {
      if (spanProcessor.isStartRequired()) {
        spanProcessorsStart.add(spanProcessor);
      }
      if (spanProcessor.isEndRequired()) {
        spanProcessorsEnd.add(spanProcessor);
      }
    }
  }
}