io.undertow.server.handlers.proxy.mod_cluster.ModClusterProxyTarget Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed 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 io.undertow.server.handlers.proxy.mod_cluster;

import java.util.Iterator;

import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.proxy.ProxyClient;

/**
 * @author Emanuel Muckenhuber
 * @author Radoslav Husar
 */
public interface ModClusterProxyTarget extends ProxyClient.ProxyTarget, ProxyClient.MaxRetriesProxyTarget {

    /**
     * Resolve the responsible context handling this request.
     *
     * @param exchange the http server exchange
     * @return the context
     */
    Context resolveContext(HttpServerExchange exchange);

    class ExistingSessionTarget implements ModClusterProxyTarget {

        private final String session;
        private final Iterator routes;
        private final VirtualHost.HostEntry entry;
        private final boolean forceStickySession;
        private final ModClusterContainer container;

        private boolean resolved;
        private Context resolvedContext;

        public ExistingSessionTarget(String session, Iterator routes, VirtualHost.HostEntry entry, ModClusterContainer container, boolean forceStickySession) {
            this.session = session;
            this.routes = routes;
            this.entry = entry;
            this.container = container;
            this.forceStickySession = forceStickySession;
        }

        @Override
        public Context resolveContext(HttpServerExchange exchange) {
            resolveContextIfUnresolved();

            return resolvedContext;
        }

        void resolveContextIfUnresolved() {
            if (resolved) return;

            resolved = true;
            boolean firstResolved = false;
            String firstRoute = null;
            String firstRouteDomain = null;

            while (routes.hasNext()) {
                final String jvmRoute = routes.next().toString();

                final Context context = entry.getContextForNode(jvmRoute);
                if (context != null && context.checkAvailable(true)) {
                    final Node node = context.getNode();
                    node.elected(); // Maybe move this to context#handleRequest
                    this.resolvedContext = context;
                    return;
                }

                if (!firstResolved) {
                    firstResolved = true;
                    firstRoute = jvmRoute;
                    firstRouteDomain = context != null ? context.getNode().getNodeConfig().getDomain() : null;
                }
            }

            this.resolvedContext = container.findFailoverNode(entry, firstRouteDomain, session, firstRoute, forceStickySession);
        }

        @Override
        public int getMaxRetries() {
            resolveContextIfUnresolved();

            if (resolvedContext == null) {
                return 0;
            }
            Balancer balancer = resolvedContext.getNode().getBalancer();
            if(balancer == null) {
                return 0;
            }
            return balancer.getMaxRetries();
        }
    }

    class BasicTarget implements ModClusterProxyTarget {

        private final VirtualHost.HostEntry entry;
        private final ModClusterContainer container;
        private Context resolved;

        public BasicTarget(VirtualHost.HostEntry entry, ModClusterContainer container) {
            this.entry = entry;
            this.container = container;
        }

        @Override
        public int getMaxRetries() {
            if(resolved == null) {
                resolveNode();
            }
            if(resolved == null) {
                return 0;
            }
            Balancer balancer = resolved.getNode().getBalancer();
            if(balancer == null) {
                return 0;
            }
            return balancer.getMaxRetries();
        }

        @Override
        public Context resolveContext(HttpServerExchange exchange) {
            if(resolved == null) {
                resolveNode();
            }
            return resolved;
        }

        private void resolveNode() {
            this.resolved = container.findNewNode(entry);
        }
    }

}