org.springframework.boot.web.embedded.jetty.JettyWebServer.java Source code

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/*
 * Copyright 2012-2018 the original author or authors.
 *
 * 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 org.springframework.boot.web.embedded.jetty;

import java.net.BindException;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.NetworkConnector;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.HandlerCollection;
import org.eclipse.jetty.server.handler.HandlerWrapper;
import org.eclipse.jetty.util.component.AbstractLifeCycle;

import org.springframework.boot.web.server.PortInUseException;
import org.springframework.boot.web.server.WebServer;
import org.springframework.boot.web.server.WebServerException;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;

/**
 * {@link WebServer} that can be used to control a Jetty web server.
 *
 * @author Phillip Webb
 * @author Dave Syer
 * @author David Liu
 * @author Edd Melndez
 * @author Brian Clozel
 * @author Kristine Jetzke
 * @since 2.0.0
 * @see JettyReactiveWebServerFactory
 */
public class JettyWebServer implements WebServer {

    private static final Log logger = LogFactory.getLog(JettyWebServer.class);

    private final Object monitor = new Object();

    private final Server server;

    private final boolean autoStart;

    private Connector[] connectors;

    private volatile boolean started;

    /**
     * Create a new {@link JettyWebServer} instance.
     * @param server the underlying Jetty server
     */
    public JettyWebServer(Server server) {
        this(server, true);
    }

    /**
     * Create a new {@link JettyWebServer} instance.
     * @param server the underlying Jetty server
     * @param autoStart if auto-starting the server
     */
    public JettyWebServer(Server server, boolean autoStart) {
        this.autoStart = autoStart;
        Assert.notNull(server, "Jetty Server must not be null");
        this.server = server;
        initialize();
    }

    private void initialize() {
        synchronized (this.monitor) {
            try {
                // Cache the connectors and then remove them to prevent requests being
                // handled before the application context is ready.
                this.connectors = this.server.getConnectors();
                this.server.addBean(new AbstractLifeCycle() {

                    @Override
                    protected void doStart() throws Exception {
                        for (Connector connector : JettyWebServer.this.connectors) {
                            Assert.state(connector.isStopped(),
                                    () -> "Connector " + connector + " has been started prematurely");
                        }
                        JettyWebServer.this.server.setConnectors(null);
                    }

                });
                // Start the server so that the ServletContext is available
                this.server.start();
                this.server.setStopAtShutdown(false);
            } catch (Throwable ex) {
                // Ensure process isn't left running
                stopSilently();
                throw new WebServerException("Unable to start embedded Jetty web server", ex);
            }
        }
    }

    private void stopSilently() {
        try {
            this.server.stop();
        } catch (Exception ex) {
            // Ignore
        }
    }

    @Override
    public void start() throws WebServerException {
        synchronized (this.monitor) {
            if (this.started) {
                return;
            }
            this.server.setConnectors(this.connectors);
            if (!this.autoStart) {
                return;
            }
            try {
                this.server.start();
                for (Handler handler : this.server.getHandlers()) {
                    handleDeferredInitialize(handler);
                }
                Connector[] connectors = this.server.getConnectors();
                for (Connector connector : connectors) {
                    try {
                        connector.start();
                    } catch (BindException ex) {
                        if (connector instanceof NetworkConnector) {
                            throw new PortInUseException(((NetworkConnector) connector).getPort());
                        }
                        throw ex;
                    }
                }
                this.started = true;
                JettyWebServer.logger.info("Jetty started on port(s) " + getActualPortsDescription()
                        + " with context path '" + getContextPath() + "'");
            } catch (WebServerException ex) {
                stopSilently();
                throw ex;
            } catch (Exception ex) {
                stopSilently();
                throw new WebServerException("Unable to start embedded Jetty server", ex);
            }
        }
    }

    private String getActualPortsDescription() {
        StringBuilder ports = new StringBuilder();
        for (Connector connector : this.server.getConnectors()) {
            if (ports.length() != 0) {
                ports.append(", ");
            }
            ports.append(getLocalPort(connector)).append(getProtocols(connector));
        }
        return ports.toString();
    }

    private Integer getLocalPort(Connector connector) {
        try {
            // Jetty 9 internals are different, but the method name is the same
            return (Integer) ReflectionUtils
                    .invokeMethod(ReflectionUtils.findMethod(connector.getClass(), "getLocalPort"), connector);
        } catch (Exception ex) {
            JettyWebServer.logger.info("could not determine port ( " + ex.getMessage() + ")");
            return 0;
        }
    }

    private String getProtocols(Connector connector) {
        List<String> protocols = connector.getProtocols();
        return " (" + StringUtils.collectionToDelimitedString(protocols, ", ") + ")";
    }

    private String getContextPath() {
        return Arrays.stream(this.server.getHandlers()).filter(ContextHandler.class::isInstance)
                .map(ContextHandler.class::cast).map(ContextHandler::getContextPath)
                .collect(Collectors.joining(" "));
    }

    private void handleDeferredInitialize(Handler... handlers) throws Exception {
        for (Handler handler : handlers) {
            if (handler instanceof JettyEmbeddedWebAppContext) {
                ((JettyEmbeddedWebAppContext) handler).deferredInitialize();
            } else if (handler instanceof HandlerWrapper) {
                handleDeferredInitialize(((HandlerWrapper) handler).getHandler());
            } else if (handler instanceof HandlerCollection) {
                handleDeferredInitialize(((HandlerCollection) handler).getHandlers());
            }
        }
    }

    @Override
    public void stop() {
        synchronized (this.monitor) {
            this.started = false;
            try {
                this.server.stop();
            } catch (InterruptedException ex) {
                Thread.currentThread().interrupt();
            } catch (Exception ex) {
                throw new WebServerException("Unable to stop embedded Jetty server", ex);
            }
        }
    }

    @Override
    public int getPort() {
        Connector[] connectors = this.server.getConnectors();
        for (Connector connector : connectors) {
            // Probably only one...
            return getLocalPort(connector);
        }
        return 0;
    }

    /**
     * Returns access to the underlying Jetty Server.
     * @return the Jetty server
     */
    public Server getServer() {
        return this.server;
    }

}