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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * Copyright (c) 2014, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.client.spi;

import jakarta.ws.rs.client.Client;
import jakarta.ws.rs.core.Configuration;

/**
 * Caching connector provider.
 *
 * This utility provider can be used to serve as a lazily initialized provider of the same connector instance.
 * 
 * Note however that the connector instance will be configured using the runtime configuration of the first client instance that
 * has invoked the {@link #getConnector(jakarta.ws.rs.client.Client, jakarta.ws.rs.core.Configuration)} method.
 * {@link jakarta.ws.rs.client.Client} and {@link jakarta.ws.rs.core.Configuration} instance passed to subsequent
 * {@code getConnector(...)} invocations will be ignored. As such, this connector provider should not be shared among client
 * instances that have significantly different connector-specific settings.
 * 
 *
 * @author Marek Potociar
 * @since 2.10
 */
public class CachingConnectorProvider implements ConnectorProvider {

    private final ConnectorProvider delegate;
    private Connector connector;


    /**
     * Create the caching connector provider.
     *
     * @param delegate delegate connector provider that will be used to initialize and create the connector instance which
     *                 will be subsequently cached and reused.
     */
    public CachingConnectorProvider(final ConnectorProvider delegate) {
        this.delegate = delegate;
    }

    @Override
    public synchronized Connector getConnector(Client client, Configuration runtimeConfig) {
        if (connector == null) {
            connector = delegate.getConnector(client, runtimeConfig);
        }
        return connector;
    }
}