MockRequestMetadataCallback.java

/*
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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package com.google.auth.oauth2;

import com.google.auth.RequestMetadataCallback;
import com.google.common.base.Preconditions;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CountDownLatch;

/** Mock RequestMetadataCallback */
public final class MockRequestMetadataCallback implements RequestMetadataCallback {
  volatile Map<String, List<String>> metadata;
  volatile Throwable exception;
  CountDownLatch latch = new CountDownLatch(1);

  /** Called when metadata is successfully produced. */
  @Override
  public void onSuccess(Map<String, List<String>> metadata) {
    checkNotSet();
    this.metadata = metadata;
    latch.countDown();
  }

  /** Called when metadata generation failed. */
  @Override
  public void onFailure(Throwable exception) {
    checkNotSet();
    this.exception = exception;
    latch.countDown();
  }

  public void reset() {
    this.metadata = null;
    this.exception = null;
    latch = new CountDownLatch(1);
  }

  public Map<String, List<String>> awaitResult() throws Throwable {
    latch.await();
    if (exception != null) {
      throw exception;
    } else {
      return metadata;
    }
  }

  private void checkNotSet() {
    Preconditions.checkState(this.metadata == null);
    Preconditions.checkState(this.exception == null);
  }
}