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package com.c2kernel.process.module;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Properties;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.proxy.ItemProxy;
import com.c2kernel.lookup.DomainPath;
import com.c2kernel.persistency.outcome.OutcomeValidator;
import com.c2kernel.persistency.outcome.Schema;
import com.c2kernel.process.Gateway;
import com.c2kernel.scripting.ScriptingEngineException;
import com.c2kernel.utils.FileStringUtility;
import com.c2kernel.utils.Logger;
import com.c2kernel.utils.Resource;
public class ModuleManager {
ArrayList<Module> modules = new ArrayList<Module>();
HashMap<String, String> modulesXML = new HashMap<String, String>();
Properties props = new Properties();
boolean isServer;
OutcomeValidator moduleValidator;
public ModuleManager(Enumeration<URL> moduleEnum, boolean isServer) throws ModuleException {
this.isServer = isServer;
try {
Schema moduleSchema = new Schema("Module", 0, false,
FileStringUtility.url2String(Resource.getKernelResourceURL("boot/OD/Module.xsd")));
moduleValidator = new OutcomeValidator(moduleSchema);
} catch (InvalidDataException ex) {
Logger.error(ex);
throw new ModuleException("Module Schema is not valid");
} catch (IOException ex) {
throw new ModuleException("Could not load Module Schema from kernel resources");
}
ArrayList<String> loadedModules = new ArrayList<String>();
ArrayList<String> moduleNs = new ArrayList<String>();
while(moduleEnum.hasMoreElements()) {
URL newModuleURL = moduleEnum.nextElement();
try {
String moduleXML = FileStringUtility.url2String(newModuleURL);
String errors = moduleValidator.validate(moduleXML);
if (errors.length() > 0)
throw new ModuleException("Module XML found at "+newModuleURL+" was not valid: "+errors);
Module newModule = (Module)Gateway.getMarshaller().unmarshall(moduleXML);
if (newModule.resURL != null && newModule.resURL.length()>0) Resource.addModuleBaseURL(newModule.ns, newModule.resURL);
modules.add(newModule);
modulesXML.put(newModule.ns, moduleXML);
if (loadedModules.contains(newModule.getName())) throw new ModuleException("Module name clash: "+newModule.getName());
if (moduleNs.contains(newModule.getNs())) throw new ModuleException("Module namespace clash: "+newModule.getNs());
Logger.debug(4, "Module found: "+newModule.getNs()+" - "+newModule.getName());
loadedModules.add(newModule.getName()); moduleNs.add(newModule.getNs());
Properties modProp = newModule.getProperties(isServer);
for (Enumeration<?> e = modProp.propertyNames(); e.hasMoreElements();) {
String propName = (String)e.nextElement();
props.put(propName, modProp.get(propName));
}
} catch (ModuleException e) {
Logger.error("Could not load module description from "+newModuleURL);
throw e;
} catch (Exception e) {
Logger.error(e);
throw new ModuleException("Could not load module.xml from "+newModuleURL);
}
}
Logger.debug(5, "Checking dependencies");
boolean allDepsPresent = false;
ArrayList<String> prevModules = new ArrayList<String>();
for (int i=0; i<modules.size();i++) {
boolean depClean = false;
int skipped = 0;
Module thisMod = modules.get(i);
while (!depClean) {
ArrayList<String> deps = thisMod.getDependencies();
depClean = true;
for (String dep : deps) {
if (!loadedModules.contains(dep)) {
Logger.error("UNMET MODULE DEPENDENCY: "+thisMod.getName()+" requires "+dep);
allDepsPresent = true;
}
else if (!prevModules.contains(dep)) {
Logger.msg("ModuleManager: Shuffling "+thisMod.getName()+" to the end to fulfil dependency on "+dep);
modules.remove(i);
modules.add(thisMod);
thisMod = modules.get(i);
skipped++;
depClean = false;
}
}
if (skipped > modules.size()-i) {
StringBuffer badMod = new StringBuffer();
for (Module mod : modules.subList(i, modules.size())) {
badMod.append(mod.getName()).append(" ");
}
Logger.die("Circular module dependencies involving: "+badMod);
}
}
prevModules.add(thisMod.getName());
}
if (allDepsPresent) Logger.die("Unmet module dependencies. Cannot continue");
}
public String getModuleVersions() {
StringBuffer ver = new StringBuffer();
for (Module thisMod : modules) {
if (ver.length()>0) ver.append("; ");
ver.append(thisMod.getName()+" ("+thisMod.getVersion()+")");
}
return ver.toString();
}
public Properties getAllModuleProperties() {
return props;
}
public void runScripts(String event) {
for (Module thisMod : modules) {
try {
thisMod.runScript(event, isServer);
} catch (ScriptingEngineException e) {
Logger.error(e);
Logger.die(e.getMessage());
}
}
}
public void registerModules() throws ModuleException {
ItemProxy serverEntity;
try {
serverEntity = (ItemProxy)Gateway.getProxyManager().getProxy(new DomainPath("/servers/"+Gateway.getProperty("ItemServer.name")));
} catch (ObjectNotFoundException e) {
throw new ModuleException("Cannot find local server name.");
}
Logger.debug(3, "Registering modules");
for (Module thisMod : modules) {
Logger.msg("Registering module "+thisMod.getName());
try {
thisMod.importAll(serverEntity, modulesXML.get(thisMod.ns));
} catch (Exception e) {
Logger.error(e);
throw new ModuleException("Error importing items for module "+thisMod.getName());
}
Logger.msg("Module "+thisMod.getName()+" registered");
try {
thisMod.runScript("startup", true);
} catch (ScriptingEngineException e) {
Logger.error(e);
throw new ModuleException("Error in startup script for module "+thisMod.getName());
}
}
}
public void dumpModules() {
for (Module thisMod : modules) {
try {
FileStringUtility.string2File(thisMod.getName()+".xml", Gateway.getMarshaller().marshall(thisMod));
} catch (Exception e) {
Logger.error(e);
}
}
}
}
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