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There is a newer version: 6.3.0

/*
 * Copyright The OpenZipkin Authors
 * SPDX-License-Identifier: Apache-2.0
 */
package brave.sampler;

/**
 * Returns true if this rule matches the input parameters
 *
 * Implement {@link #hashCode()} and {@link #equals(Object)} if you want to replace existing
 * rules by something besides object identity.
 *
 * @see Matchers
 * @since 5.8
 */
public interface Matcher {
  boolean matches(P parameters);
}