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/**
* Copyright (C) 2000-2010 Atomikos
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* 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.
*/
package com.atomikos.icatch.config;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.Stack;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;
import com.atomikos.datasource.RecoverableResource;
import com.atomikos.icatch.CompositeTransactionManager;
import com.atomikos.icatch.ExportingTransactionManager;
import com.atomikos.icatch.ImportingTransactionManager;
import com.atomikos.icatch.SysException;
import com.atomikos.icatch.TSListener;
import com.atomikos.icatch.admin.LogAdministrator;
import com.atomikos.util.ClassLoadingHelper;
/**
*
*
*
* This is the main class for creating a UserTransactionService instance.
* This class is the client's main entry point into the transaction engine.
*
* The creation of a user transaction happens via a UserTransactionServiceFactory
* which is looked up by this object behind the scenes.
* Instances can be serialized to disk and re-read at a later time.
* Note: deserialization will only work in the SAME configuration as the
* one that did the streaming out. In particular, if no identical Atomikos
* transaction service is present in the target VM then the process
* of deserialization will be erroneous.
*/
public class UserTransactionServiceImp
implements java.io.Serializable , UserTransactionService
{
private static final long serialVersionUID = -3374591336514451887L;
/**
* Constant denoting the system property name that suggest NOT to use
* any configuration file for the transaction service's properties.
* If this a system property with this name is set to an arbitrary value
* then the transaction service will attempt initialization based on
* system properties only. In that case, all the parameters that would
* normally be set through the properties file have to be supplied as
* system properties with the same name and corresponding value.
*/
public static final String NO_FILE_PROPERTY_NAME = "com.atomikos.icatch.no_file";
/**
* The name of the system property whose value corresponds to the path
* towards the properties file for initialization of the transaction service.
* If this system property is set then the corresponding file path will be
* used to load the initialization parameters for the transaction service.
* Otherwise, the transaction service will attempt to load the default
* file from the classpath.
*/
public static final String FILE_PATH_PROPERTY_NAME = "com.atomikos.icatch.file";
/**
* The name of the system property to disable printing 'Using init file...' messages
* to System.err - if this system property to an arbitrary value then no such message
* will be shown on System.err during startup.
*/
public static final String HIDE_INIT_FILE_PATH_PROPERTY_NAME = "com.atomikos.icatch.hide_init_file_path";
/**
* The default file name for the transaction service's init parameters.
*
*/
public static final String DEFAULT_PROPERTIES_FILE_NAME = "transactions.properties";
private static final String PRE_3_0_DEFAULT_PROPERTIES_FILE_NAME = "jta.properties";
private Properties properties_;
private List tsListeners_;
private List logAdministrators_;
private List resources_;
private transient UserTransactionService delegate_;
//the instance to delegate to; obtained from factory
/**
* Replace ${...} sequence with the referenced value from the given properties or
* (if not found) the system properties -
* contributed through Marian Kelc ([email protected])
* E-Plus Mobilfunk GmbH & Co. KG, Germany
*/
private static String evaluateReference ( String value , Properties properties )
{
String result = value;
//by default, the value as-is is returned
int startIndex = value.indexOf ( '$' );
if ( startIndex > -1 && value.charAt ( startIndex +1 ) == '{') {
//at least one reference is found
int endIndex = value.indexOf ( '}' );
if ( startIndex + 2 == endIndex )
throw new IllegalArgumentException ( "property ref cannot refer to an empty name: ${}" );
if ( endIndex == -1 )
throw new IllegalArgumentException ( "unclosed property ref: ${" + value.substring ( startIndex + 2 ) );
//strip-off reference characters -> get the referenced property name
String subPropertyKey = value.substring ( startIndex + 2, endIndex );
//the properties take precedence -> try them first
String subPropertyValue = properties.getProperty ( subPropertyKey );
if ( subPropertyValue == null ) {
//not found in properties -> try system property
subPropertyValue = System.getProperty ( subPropertyKey );
}
if ( subPropertyValue != null ) {
//in-line refs supported - result is prefix + value + suffix !!!
result = result.substring ( 0, startIndex ) + subPropertyValue + result.substring ( endIndex +1 );
//two or more refs supported - evaluate any remaining references in the value
result = evaluateReference ( result , properties );
}
else {
//referenced value not found -> ignore any other references and return value as-is
//NOTE: trying to resolve further references would lead to infinite recursion
}
}
return result;
}
private static void logToStdErr ( String msg )
{
if ( System.getProperty ( HIDE_INIT_FILE_PATH_PROPERTY_NAME ) == null ) {
System.err.println ( msg );
}
}
private static Properties mergeProperties ( Properties first, Properties defaults )
{
Enumeration names = first.propertyNames();
while ( names.hasMoreElements() ) {
String name = ( String ) names.nextElement();
String value = first.getProperty ( name );
defaults.setProperty ( name , value );
}
return defaults;
}
private URL findPropertiesFileInClasspath ( String fileName )
{
URL ret = null;
// FIRST: look in application classpath (cf ISSUE 10091)
ret = ClassLoadingHelper.loadResourceFromClasspath( getClass() , fileName );
if ( ret == null ) {
//if not found in app classpath: try what we always did:
//lookup as a system resource, without extra prefix
ret = getClass().getClassLoader().
getSystemResource ( fileName );
}
return ret;
}
private Properties findProperties()
{
Properties p = new Properties();
//look for system property that specifies the transactions.properties file
//if not found: look for properties file in classpath
//if not found: use default properties
java.net.URL url = null;
if ( System.getProperty ( NO_FILE_PROPERTY_NAME ) == null ) {
String filename = System.getProperty ( FILE_PATH_PROPERTY_NAME );
if ( filename == null ) {
filename = DEFAULT_PROPERTIES_FILE_NAME;
logToStdErr ( "No properties path set - looking for " +
DEFAULT_PROPERTIES_FILE_NAME +
" in classpath..." );
url = findPropertiesFileInClasspath ( filename );
if ( url == null ) {
filename = PRE_3_0_DEFAULT_PROPERTIES_FILE_NAME;
logToStdErr ( DEFAULT_PROPERTIES_FILE_NAME + " not found - looking for " +
PRE_3_0_DEFAULT_PROPERTIES_FILE_NAME +
" in classpath..." );
url = findPropertiesFileInClasspath ( filename );
}
}
else {
//a file was given
java.io.File file = new java.io.File ( filename );
try
{
url = file.toURL();
}
catch (MalformedURLException e)
{
//ignore: just leave url null
//and use default
}
}
try {
if ( url == null ) throw new IOException();
logToStdErr ( "Using init file: " + url.getPath() );
InputStream in = url.openStream();
p.load ( in );
in.close();
}
catch ( IOException io ) {
//io.printStackTrace();
String msg = "Failed to open transactions properties file - using default values";
//Configuration.logWarning ( msg , io );
logToStdErr ( msg );
//use the default standalone service
p.setProperty ( "com.atomikos.icatch.service" ,
"com.atomikos.icatch.standalone.UserTransactionServiceFactory" );
}
}
else {
//NO property file should be used, so try system property
//but ONLY for the factory class: each implementation should
//get its own specific properties
p.setProperty ( "com.atomikos.icatch.service" ,
System.getProperty ( "com.atomikos.icatch.service" ));
}
//resolve referenced values with ant-like ${...} syntax
java.util.Enumeration allProps= p.propertyNames();
while ( allProps.hasMoreElements() ) {
String key = ( String ) allProps.nextElement();
String raw = p.getProperty ( key );
String value= evaluateReference ( raw , p );
if ( !raw.equals ( value ) ) {
p.setProperty ( key, value );
}
}
return p;
}
private String getOrFindProperty ( String name )
{
if ( properties_ == null ) properties_ = findProperties();
return properties_.getProperty ( name );
}
/**
* Default constructor.
*
*/
public UserTransactionServiceImp ()
{
tsListeners_ = new ArrayList();
logAdministrators_ = new ArrayList();
resources_ = new ArrayList();
}
/**
* Constructs a new instance and initializes it with the given properties.
* If this constructor is called, then file-based initialization is overridden.
* In particular, the given properties will take precedence over the file-based
* properties (if found).
*
* @param properties The properties.
*/
public UserTransactionServiceImp ( Properties properties )
{
this();
properties_ = findProperties();
//override defaults in file with specified properties
properties_.putAll ( properties );
}
private void checkInit ()
{
if ( delegate_ != null ) return;
String factoryClassName = getOrFindProperty ( "com.atomikos.icatch.service" );
if ( factoryClassName == null )
throw new SysException (
"UserTransactionServiceImp: property not defined: com.atomikos.icatch.service" );
try {
Class factoryClass = ClassLoadingHelper.loadClass ( factoryClassName );
UserTransactionServiceFactory factory =
( UserTransactionServiceFactory ) factoryClass.newInstance ();
delegate_ = factory.getUserTransactionService ( properties_ );
//This should initialize the properties with whatever is specified and
//use SYSTEM_DEPENDENT DEFAULT values for others
}
catch ( Exception e ) {
Stack errors = new Stack ();
errors.push ( e );
throw new SysException ( "Error in init of UserTransactionServiceImp: " + e.getMessage() , errors );
}
}
/**
*
* @see UserTransactionService
*/
public TSInitInfo createTSInitInfo ()
{
TSInitInfo ret = null;
checkInit ();
ret = delegate_.createTSInitInfo ();
Properties p = mergeProperties ( properties_ , ret.getProperties() );
ret.setProperties ( p );
return ret;
}
/**
*
* @see UserTransactionService
*/
public void shutdown ( boolean force )
throws IllegalStateException
{
checkInit ();
delegate_.shutdown ( force );
}
/**
*@see UserTransactionService
*/
public void init ( TSInitInfo info )
throws SysException
{
checkInit ();
Iterator it = resources_.iterator();
while ( it.hasNext() ) {
RecoverableResource nxt = ( RecoverableResource ) it.next();
registerResource ( nxt );
}
it = logAdministrators_.iterator();
while ( it.hasNext() ) {
LogAdministrator nxt = ( LogAdministrator ) it.next();
registerLogAdministrator ( nxt );
}
it = tsListeners_.iterator();
while ( it.hasNext() ) {
TSListener nxt = ( TSListener ) it.next();
registerTSListener ( nxt );
}
delegate_.init ( info );
}
/**
*@see UserTransactionService
*/
public CompositeTransactionManager
getCompositeTransactionManager ()
{
checkInit ();
return delegate_.getCompositeTransactionManager ();
}
/**
*@see UserTransactionService
*/
public TransactionManager getTransactionManager ()
{
checkInit ();
return delegate_.getTransactionManager ();
}
/**
*@see UserTransactionService
*/
public UserTransaction getUserTransaction ()
{
checkInit ();
return delegate_.getUserTransaction ();
}
/**
*@see UserTransactionService
*/
public ImportingTransactionManager getImportingTransactionManager ()
{
checkInit ();
return delegate_.getImportingTransactionManager ();
}
/**
*@see UserTransactionService
*/
public ExportingTransactionManager getExportingTransactionManager ()
{
checkInit ();
return delegate_.getExportingTransactionManager ();
}
/**
*@see UserTransactionService
*/
public TSMetaData getTSMetaData ()
{
checkInit ();
return delegate_.getTSMetaData ();
}
/**
* @see com.atomikos.icatch.UserTransactionService#registerResource(com.atomikos.datasource.RecoverableResource)
*/
public void registerResource(RecoverableResource res)
{
checkInit();
delegate_.registerResource(res);
}
/**
* @see com.atomikos.icatch.UserTransactionService#registerLogAdministrator(com.atomikos.icatch.admin.LogAdministrator)
*/
public void registerLogAdministrator(LogAdministrator admin)
{
checkInit();
delegate_.registerLogAdministrator ( admin );
}
/**
* @see com.atomikos.icatch.UserTransactionService#getResources()
*/
public Enumeration getResources()
{
checkInit();
return delegate_.getResources();
}
/**
* @see com.atomikos.icatch.UserTransactionService#getLogAdministrators()
*/
public Enumeration getLogAdministrators()
{
checkInit();
return delegate_.getLogAdministrators();
}
public void removeResource ( RecoverableResource res )
{
checkInit();
delegate_.removeResource ( res );
}
public void removeLogAdministrator ( LogAdministrator admin )
{
checkInit();
delegate_.removeLogAdministrator ( admin );
}
public void registerTSListener ( TSListener listener )
{
checkInit();
delegate_.registerTSListener ( listener );
}
public void removeTSListener ( TSListener listener )
{
checkInit();
delegate_.removeTSListener ( listener );
}
/**
* Convenience shutdown method for DI containers like Spring.
*
*/
public void shutdownForce()
{
shutdown ( true );
}
/**
* Convenience shutdown method for DI containers like Spring.
*
*/
public void shutdownWait()
{
shutdown ( false );
}
/**
* Dependency injection of all resources to be added during init.
*
* @param resources
*/
public void setInitialRecoverableResources ( List resources )
{
resources_ = resources;
}
/**
* Dependency injection of all administrators to be added during init.
*
* @param administrators
*/
public void setInitialLogAdministrators ( List administrators )
{
logAdministrators_ = administrators;
}
/**
* Dependency injection of all listeners to be added during init.
* @param listeners
*/
public void setInitialTSListeners ( List listeners )
{
tsListeners_ = listeners;
}
/**
* Convenience init method for DI containers like Spring.
*
*/
public void init()
{
TSInitInfo info = createTSInitInfo();
init ( info );
}
public void init ( Properties properties ) throws SysException {
TSInitInfo info = createTSInitInfo();
mergeProperties ( properties , info.getProperties() );
init ( info );
}
}
