co.stateful.RtLock Maven / Gradle / Ivy

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/*
 * Copyright (c) 2014-2023, 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.
 *
 * @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();
        if (Logger.isInfoEnabled(this)) {
            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;
        if (Logger.isInfoEnabled(this)) {
            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;
        if (Logger.isInfoEnabled(this)) {
            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));
    }

}