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Mule service that allows to create HTTP servers and clients

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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.http.api.utils;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.mule.runtime.api.exception.MuleRuntimeException;

import java.net.URI;

import static org.mule.runtime.api.i18n.I18nMessageFactory.createStaticMessage;

/**
 * Cache to avoid recalculating URIs more than once
 *
 * @since 4.0
 */
public class UriCache {

  private static final int MAX_CACHE_SIZE = 2000;
  private static volatile UriCache instance;

  private Cache cache = CacheBuilder.newBuilder().maximumSize(MAX_CACHE_SIZE).build();

  private UriCache() {}

  public static UriCache getInstance() {
    if (instance == null) {
      synchronized (UriCache.class) {
        if (instance == null) {
          instance = new UriCache();
        }
      }
    }
    return instance;
  }

  public static URI getUriFromString(String uri) {
    try {
      return getInstance().cache.get(uri, () -> URI.create(uri));
    } catch (Exception e) {
      if (e.getCause() != null && e.getCause() instanceof RuntimeException) {
        throw (RuntimeException) e.getCause();
      } else {
        throw new MuleRuntimeException(createStaticMessage("Could not create URI for " + uri, e));
      }
    }
  }
}