com.vaadin.base.devserver

Class AbstractDevServerRunner

java.lang.Object

com.vaadin.base.devserver.AbstractDevServerRunner

All Implemented Interfaces:

DevModeHandler, RequestHandler, Serializable

Direct Known Subclasses:

ViteHandler, WebpackHandler

public abstract class AbstractDevServerRunner
extends Object
implements DevModeHandler

Deals with most details of starting a frontend development server or connecting to an existing one.

This class is meant to be used during developing time.

For internal use only. May be renamed or removed in a future release.

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDevServerRunner(Lookup lookup, int runningPort, File npmFolder, CompletableFuture<Void> waitFor) Craete an instance that waits for the given task to complete before starting or connecting to the server.

Method Summary

Modifier and Type	Method and Description
protected boolean	checkConnection() Check the connection to the dev server.
protected Process	doStartDevServer() Starts the dev server and returns the started process.
protected ApplicationConfiguration	getApplicationConfiguration() Gets the application configuration.
String	getFailedOutput() Return the dev server console output when a compilation error happened.
int	getPort() Get the listening port of the dev server.
File	getProjectRoot() Gets the project root folder.
protected abstract File	getServerBinary() Gets the binary that starts the dev server.
protected abstract File	getServerConfig() Gets the main configuration file for the dev server.
protected abstract Pattern	getServerFailurePattern() Gets a pattern to match with the output to determine that the server has failed to start.
protected abstract String	getServerName() Gets the name of the dev server for outputting to the user and statistics.
protected abstract List<String>	getServerStartupCommand(String nodeExec) Gets the commands to run to start the dev server.
protected abstract Pattern	getServerSuccessPattern() Gets a pattern to match with the output to determine that the server has started successfully.
protected com.vaadin.base.devserver.DevServerWatchDog	getWatchDog() Gets the server watch dog.
boolean	handleRequest(VaadinSession session, VaadinRequest request, VaadinResponse response) Called when a request needs to be handled.
protected void	onDevServerCompilation(DevServerOutputTracker.Result result) Called whenever the dev server output matche the success or failure pattern.
HttpURLConnection	prepareConnection(String path, String method) Prepare a HTTP connection against the dev server.
boolean	serveDevModeRequest(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Serve a file by proxying to the dev server.
void	stop() Stop the dev-server.
protected void	triggerLiveReload() Triggers live reload.
protected void	updateServerStartupEnvironment(FrontendTools frontendTools, Map<String,String> environment) Defines the environment variables to use when starting the dev server.
protected void	validateFiles() Validates that the needed server binary and config file(s) are available.
void	waitForDevServer() Waits for the dev server to start.
protected void	writeStream(javax.servlet.ServletOutputStream outputStream, InputStream inputStream)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractDevServerRunner

protected AbstractDevServerRunner(Lookup lookup,
                                  int runningPort,
                                  File npmFolder,
                                  CompletableFuture<Void> waitFor)

Craete an instance that waits for the given task to complete before starting or connecting to the server.

Parameters:

lookup - a lookup instance

runningPort - the port that a dev server is already running on or 0 to start a new server

npmFolder - the project root

waitFor - the task to wait for before running the server.

Method Detail

validateFiles

protected void validateFiles()
                      throws ExecutionFailedException

Validates that the needed server binary and config file(s) are available.

Throws:

ExecutionFailedException - if there is a problem

getServerBinary

protected abstract File getServerBinary()

Gets the binary that starts the dev server.

getServerConfig

protected abstract File getServerConfig()

Gets the main configuration file for the dev server.

getServerName

protected abstract String getServerName()

Gets the name of the dev server for outputting to the user and statistics.

getServerStartupCommand

protected abstract List<String> getServerStartupCommand(String nodeExec)

Gets the commands to run to start the dev server.

Parameters:

nodeExec - the path to the node binary

updateServerStartupEnvironment

protected void updateServerStartupEnvironment(FrontendTools frontendTools,
                                              Map<String,String> environment)

Defines the environment variables to use when starting the dev server.

Parameters:

frontendTools - frontend tools metadata

environment - the environment variables to use

getServerSuccessPattern

protected abstract Pattern getServerSuccessPattern()

Gets a pattern to match with the output to determine that the server has started successfully.

getServerFailurePattern

protected abstract Pattern getServerFailurePattern()

Gets a pattern to match with the output to determine that the server has failed to start.

doStartDevServer

protected Process doStartDevServer()

Starts the dev server and returns the started process.

Returns:

the started process or null if no process was started

onDevServerCompilation

protected void onDevServerCompilation(DevServerOutputTracker.Result result)

Called whenever the dev server output matche the success or failure pattern.

getFailedOutput

public String getFailedOutput()

Description copied from interface: DevModeHandler

Return the dev server console output when a compilation error happened.

Specified by:

getFailedOutput in interface DevModeHandler

Returns:

console output if error or null otherwise.

getWatchDog

protected com.vaadin.base.devserver.DevServerWatchDog getWatchDog()

Gets the server watch dog.

Returns:

the watch dog

triggerLiveReload

protected void triggerLiveReload()

Triggers live reload.

getProjectRoot

public File getProjectRoot()

Description copied from interface: DevModeHandler

Gets the project root folder.

Specified by:

getProjectRoot in interface DevModeHandler

Returns:

the project root folder

getApplicationConfiguration

protected ApplicationConfiguration getApplicationConfiguration()

Gets the application configuration.

Returns:

the application configuration

checkConnection

protected boolean checkConnection()

Check the connection to the dev server.

Returns:

true if the dev server is responding correctly, false otherwise

getPort

public int getPort()

Get the listening port of the dev server.

Returns:

the listening port

waitForDevServer

public void waitForDevServer()

Waits for the dev server to start.

Suspends the caller's thread until the dev mode server is started (or failed to start).

stop

public void stop()

Description copied from interface: DevModeHandler

Stop the dev-server.

Specified by:

stop in interface DevModeHandler

prepareConnection

public HttpURLConnection prepareConnection(String path,
                                           String method)
                                    throws IOException

Description copied from interface: DevModeHandler

Prepare a HTTP connection against the dev server.

Specified by:

prepareConnection in interface DevModeHandler

Parameters:

path - the file to request, needs to be safe

method - the http method to use

Returns:

the connection

Throws:

IOException - on connection error

handleRequest

public boolean handleRequest(VaadinSession session,
                             VaadinRequest request,
                             VaadinResponse response)
                      throws IOException

Description copied from interface: RequestHandler

Called when a request needs to be handled. If a response is written, this method should return true to indicate that no more request handlers should be invoked for the request.

Note that request handlers by default do not lock the session. If you are using VaadinSession or anything inside the VaadinSession you must ensure the session is locked. This can be done by extending SynchronizedRequestHandler or by using VaadinSession.accessSynchronously(Command) or UI.accessSynchronously(Command).

Specified by:

handleRequest in interface RequestHandler

Parameters:

session - The session for the request

request - The request to handle

response - The response object to which a response can be written.

Returns:

true if a response has been written and no further request handlers should be called, otherwise false

Throws:

IOException - If an IO error occurred

serveDevModeRequest

public boolean serveDevModeRequest(javax.servlet.http.HttpServletRequest request,
                                   javax.servlet.http.HttpServletResponse response)
                            throws IOException

Serve a file by proxying to the dev server.

Note: it considers the HttpServletRequest.getPathInfo() that will be the path passed to the dev server which is running in the context root folder of the application.

Method returns false immediately if dev server failed on its startup.

Specified by:

serveDevModeRequest in interface DevModeHandler

Parameters:

request - the servlet request

response - the servlet response

Returns:

false if the dev server returned a not found, true otherwise

Throws:

IOException - in the case something went wrong like connection refused

writeStream

protected void writeStream(javax.servlet.ServletOutputStream outputStream,
                           InputStream inputStream)
                    throws IOException

Throws:

IOException