/**

  * Copyright (c) 2014-2016, stateful.co

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met: 1) Redistributions of source code must retain the above

  * copyright notice, this list of conditions and the following

  * disclaimer. 2) Redistributions in binary form must reproduce the above

  * copyright notice, this list of conditions and the following

  * disclaimer in the documentation and/or other materials provided

  * with the distribution. 3) Neither the name of the stateful.co nor

  * the names of its contributors may be used to endorse or promote

  * products derived from this software without specific prior written

  * permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL

  * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 package co.stateful;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import com.jcabi.http.Request;

 import com.jcabi.http.Response;

 import com.jcabi.http.response.RestResponse;

 import com.jcabi.http.response.XmlResponse;

 import com.jcabi.log.Logger;

 import java.io.IOException;

 import java.net.HttpURLConnection;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Lock.

  *

  * @author Yegor Bugayenko (yegor@tpc2.com)

  * @version $Id$

  * @since 0.3

  * @checkstyle MultipleStringLiteralsCheck (500 lines)

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @ToString(of = "lck", includeFieldNames = false)

 @EqualsAndHashCode(of = { "lck", "request" })

 final class RtLock implements Lock {

     /**

      * Its name.

      */

     private final transient String lck;

     /**

      * Locks home.

      */

     private final transient Request request;

     /**

      * Ctor.

      * @param name Name of it

      * @param req Lock request

      */

     RtLock(final String name, final Request req) {

         this.lck = name;

         this.request = req;

     }

     @Override

     public String name() {

         return this.lck;

     }

     @Override

     public String label() throws IOException {

         final long start = System.currentTimeMillis();

         final String label = this.front("label")

             .uri().queryParam("name", this.lck).back()

             .method(Request.GET)

             .fetch()

             .body();

         Logger.info(

             this, "label of \"%s\" retrieved in %[ms]s: \"%s\"",

             this.lck,

             System.currentTimeMillis() - start,

             label

         );

         return label;

     }

     @Override

     public boolean lock(final String label) throws IOException {

         final long start = System.currentTimeMillis();

         final Response rsp = this.front("lock")

             .body().formParam("label", label)

             .formParam("name", this.lck).back()

             .method(Request.POST)

             .fetch();

         final boolean locked = rsp.status() == HttpURLConnection.HTTP_SEE_OTHER;

         Logger.info(

             this, "lock of \"%s\" is %B in %[ms]s: %s",

             this.lck, locked,

             System.currentTimeMillis() - start,

             rsp.body()

         );

         return locked;

     }

     @Override

     public boolean unlock(final String label) throws IOException {

         final long start = System.currentTimeMillis();

         final Response rsp = this.front("unlock")

             .uri().queryParam("label", label)

             .queryParam("name", this.lck).back()

             .method(Request.GET)

             .fetch();

         final boolean unlocked =

             rsp.status() == HttpURLConnection.HTTP_SEE_OTHER;

         Logger.info(

             this, "unlock of \"%s\" is %B in %[ms]s",

             this.lck, unlocked,

             System.currentTimeMillis() - start

         );

         return unlocked;

     }

     /**

      * Get front request.

      * @param label Label

      * @return Request

      * @throws IOException If fails

      */

     private Request front(final String label) throws IOException {

         return this.request

             .fetch()

             .as(RestResponse.class)

             .assertStatus(HttpURLConnection.HTTP_OK)

             .as(XmlResponse.class)

             .rel(String.format("/page/links/link[@rel='%s']/@href", label));

     }

 }