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The GWT Bean Validators is a collection of JSR-303/JSR-349/JSR 380 bean validators. It can be used on server and with the help of GWT even on client side. This packages contains rest services and validator for phone numbers based on gwtp-rest dispatcher and spring to reduce client side code.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 de.knightsoftnet.validators.client.rest.helper;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.gwt.core.shared.GWT;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

/**
 * helper class for synchronous rest get call with result caching.
 *
 * @author Manfred Tremmel
 */
public final class CachedSyncHttpGetCall {

  /**
   * cache map.
   */
  private static final LoadingCache CACHE =
      CacheBuilder.newBuilder().maximumSize(10000).expireAfterWrite(10, TimeUnit.DAYS)
          .build(new CacheLoader() {
            @Override
            public String load(final String pkey) {
              return syncRestNativeCall(pkey);
            }
          });

  /**
   * private default constructor.
   */
  private CachedSyncHttpGetCall() {
    super();
  }

  /**
   * start get rest call with given url.
   *
   * @param purl url to read
   * @return result of the call, has to be interpreted
   */
  public static String syncRestCall(final String purl) {
    try {
      return CACHE.get(purl);
    } catch (final ExecutionException e) {
      GWT.log(e.getMessage(), e);
      return null;
    }
  }

  // simple synchronous rest get call
  private static native String syncRestNativeCall(final String purl) /*-{
    var xmlHttp = new XMLHttpRequest();
    xmlHttp.open("GET", purl, false); // false for synchronous request
    xmlHttp.send(null);
    return xmlHttp.responseText;
  }-*/;
}