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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// 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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package jodd.madvoc.component;
import jodd.madvoc.ActionConfig;
import jodd.madvoc.ActionRequest;
import jodd.madvoc.MadvocException;
import jodd.madvoc.result.ActionResult;
import jodd.petite.meta.PetiteInject;
import jodd.servlet.ServletUtil;
import jodd.log.Logger;
import jodd.log.LoggerFactory;
import javax.servlet.AsyncContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletContext;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Madvoc controller invokes actions for action path and renders action results.
* It also builds action objects and result paths. It handles initialization of
* interceptors and results.
*/
public class MadvocController {
private static final Logger log = LoggerFactory.getLogger(MadvocController.class);
@PetiteInject
protected MadvocConfig madvocConfig;
@PetiteInject
protected ActionsManager actionsManager;
@PetiteInject
protected ActionPathRewriter actionPathRewriter;
@PetiteInject
protected ResultsManager resultsManager;
protected ServletContext applicationContext;
protected Executor executor;
/**
* Initializes controller by providing application context.
* Application context can be null
* if application is not started in web environment (eg tests).
*/
public void init(ServletContext servletContext) {
this.applicationContext = servletContext;
if (actionsManager.isAsyncModeOn()) {
executor = createAsyncExecutor();
}
}
/**
* Creates async executor.
*/
protected Executor createAsyncExecutor() {
MadvocConfig.AsyncConfig asyncConfig = madvocConfig.getAsyncConfig();
return new ThreadPoolExecutor(
asyncConfig.getCorePoolSize(),
asyncConfig.getMaximumPoolSize(),
asyncConfig.getKeepAliveTimeMillis(),
TimeUnit.MILLISECONDS,
new LinkedBlockingQueue(asyncConfig.getQueueCapacity()));
}
/**
* Returns application context set during the initialization.
*/
public ServletContext getApplicationContext() {
return applicationContext;
}
// ---------------------------------------------------------------- invoke
/**
* Invokes action registered to provided action path, Provides action chaining, by invoking the next action request.
* Returns null if action path is consumed and has been invoked by this controller; otherwise
* the action path string is returned (it might be different than original one, provided in arguments).
* On first invoke, initializes the action configuration before further proceeding.
*/
public String invoke(String actionPath, HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws Exception {
ActionRequest actionRequest = null;
boolean characterEncodingSet = false;
while (actionPath != null) {
if (log.isDebugEnabled()) {
log.debug("Action path: " + actionPath);
}
// build action path
String httpMethod = servletRequest.getMethod().toUpperCase();
actionPath = actionPathRewriter.rewrite(servletRequest, actionPath, httpMethod);
// resolve action configuration
ActionConfig actionConfig = actionsManager.lookup(actionPath, httpMethod);
if (actionConfig == null) {
return actionPath;
}
if (log.isDebugEnabled()) {
log.debug("Invoking action path '" + actionPath + "' using " + actionConfig.actionClass.getSimpleName());
}
// set character encoding
if (!characterEncodingSet && madvocConfig.isApplyCharacterEncoding()) {
String encoding = madvocConfig.getEncoding();
if (encoding != null) {
servletRequest.setCharacterEncoding(encoding);
servletResponse.setCharacterEncoding(encoding);
}
characterEncodingSet = true;
}
// create action object
Object action = createAction(actionConfig.actionClass);
// create action request
ActionRequest previousRequest = actionRequest;
actionRequest = createActionRequest(actionPath, actionConfig, action, servletRequest, servletResponse);
actionRequest.setPreviousActionRequest(previousRequest);
// invoke and render
if (actionConfig.isAsync()) {
AsyncContext asyncContext = servletRequest.startAsync();
executor.execute(new ActionRequestInvoker(asyncContext, actionRequest));
} else {
actionRequest.invoke();
}
actionPath = actionRequest.getNextActionPath();
}
return null;
}
/**
* Async request invoker.
*/
public static class ActionRequestInvoker implements Runnable {
private final ActionRequest actionRequest;
private final AsyncContext asyncContext;
public ActionRequestInvoker(AsyncContext asyncContext, ActionRequest actionRequest) {
this.actionRequest = actionRequest;
this.asyncContext = asyncContext;
}
public void run() {
try {
if (log.isDebugEnabled()) {
log.debug("Async call to: " + actionRequest);
}
actionRequest.invoke();
} catch (Exception ex) {
log.error("Invoking action path failed: " , ex);
} finally {
asyncContext.complete();
}
}
}
// ---------------------------------------------------------------- render
/**
* Invokes a result after the action invocation.
*
* Results may be objects that specify which action result will be used
* to render the result.
*
* Result value may consist of two parts: type and value. Result type is optional and, if exists, it is separated
* by semi-colon from the value. If type is not specified
* then the default result type if still not defined. Result type defines which
* {@link ActionResult} should be used for rendering the value.
*
* Result value is first checked against aliased values. Then, it is resolved and then passed
* to the founded {@link ActionResult}.
*
* @see ActionResult#render(jodd.madvoc.ActionRequest, Object)
*/
@SuppressWarnings("unchecked")
public void render(ActionRequest actionRequest, Object resultObject) throws Exception {
ActionResult actionResult = resultsManager.lookup(actionRequest, resultObject);
if (actionResult == null) {
throw new MadvocException("Action result not found");
}
if (madvocConfig.isPreventCaching()) {
ServletUtil.preventCaching(actionRequest.getHttpServletResponse());
}
actionResult.render(actionRequest, actionRequest.getActionResult());
}
// ---------------------------------------------------------------- create
/**
* Creates new action object from {@link ActionConfig} using default constructor.
*/
protected Object createAction(Class actionClass) {
try {
return actionClass.newInstance();
} catch (Exception ex) {
throw new MadvocException("Invalid Madvoc action", ex);
}
}
/**
* Creates new action request.
* @param actionPath action path
* @param actionConfig action configuration
* @param action action object
* @param servletRequest http request
* @param servletResponse http response
* @return action request
*/
protected ActionRequest createActionRequest(
String actionPath,
ActionConfig actionConfig,
Object action,
HttpServletRequest servletRequest,
HttpServletResponse servletResponse) {
return new ActionRequest(this, actionPath, actionConfig, action, servletRequest, servletResponse);
}
}