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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jk.common;
import java.io.IOException;
import javax.management.ObjectName;
import org.apache.jk.apr.AprImpl;
import org.apache.jk.core.JkHandler;
import org.apache.jk.core.Msg;
import org.apache.jk.core.MsgContext;
import org.apache.jk.core.JkChannel;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.C2BConverter;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.modeler.Registry;
/**
* Base class for components using native code ( libjkjni.so ).
* It allows to access the jk_env and wrap ( 'box' ? ) a native
* jk component, and call it's methods.
*
* Note that get/setAttribute are expensive ( Strings, etc ),
* invoke() is were all optimizations are done. We do recycle
* all memory on both C and java sides ( the only exception is
* when we attempt pinning but the VM doesn't support it ). The
* low level optimizations from ByteBuffer, etc are used to
* reduce the overhead of passing strings.
*
* @author Costin Manolache
*/
public class JniHandler extends JkHandler {
protected AprImpl apr;
// The native side handler
protected long nativeJkHandlerP;
protected String jkHome;
// Dispatch table codes. Hardcoded for now, will change when we have more handlers.
public static final int JK_HANDLE_JNI_DISPATCH=0x15;
public static final int JK_HANDLE_SHM_DISPATCH=0x16;
public static final int MSG_NOTE=0;
public static final int MB_NOTE=2;
private boolean paused = false;
public JniHandler() {
}
/**
*/
public void setJkHome( String s ) {
jkHome=s;
}
public String getJkHome() {
return jkHome;
}
/** You must call initNative() inside the component init()
*/
public void init() throws IOException {
// static field init, temp
}
protected void initNative(String nativeComponentName) {
apr=(AprImpl)wEnv.getHandler("apr");
if( apr==null ) {
// In most cases we can just load it automatically.
// that requires all libs to be installed in standard places
// ( LD_LIBRARY_PATH, /usr/lib
try {
apr=new AprImpl();
wEnv.addHandler("apr", apr);
apr.init();
if( oname != null ) {
ObjectName aprname=new ObjectName(oname.getDomain() +
":type=JkHandler, name=apr");
Registry.getRegistry(null, null).registerComponent(apr, aprname, null);
}
} catch( Throwable t ) {
log.debug("Can't load apr", t);
apr=null;
}
}
if( apr==null || ! apr.isLoaded() ) {
if( log.isDebugEnabled() )
log.debug("No apr, disabling jni proxy ");
apr=null;
return;
}
try {
long xEnv=apr.getJkEnv();
nativeJkHandlerP=apr.getJkHandler(xEnv, nativeComponentName );
if( nativeJkHandlerP==0 ) {
log.debug("Component not found, creating it " + nativeComponentName );
nativeJkHandlerP=apr.createJkHandler(xEnv, nativeComponentName);
}
log.debug("Native proxy " + nativeJkHandlerP );
apr.releaseJkEnv(xEnv);
} catch( Throwable t ) {
apr=null;
log.info("Error calling apr ", t);
}
}
public void appendString( Msg msg, String s, C2BConverter charsetDecoder)
throws IOException
{
ByteChunk bc=charsetDecoder.getByteChunk();
charsetDecoder.recycle();
charsetDecoder.convert( s );
charsetDecoder.flushBuffer();
msg.appendByteChunk( bc );
}
public void pause() throws Exception {
synchronized(this) {
paused = true;
}
}
public void resume() throws Exception {
synchronized(this) {
paused = false;
notifyAll();
}
}
/** Create a msg context to be used with the shm channel
*/
public MsgContext createMsgContext() {
if( nativeJkHandlerP==0 || apr==null )
return null;
synchronized(this) {
try{
while(paused) {
wait();
}
}catch(InterruptedException ie) {
// Ignore, since it can't happen
}
}
try {
MsgContext msgCtx=new MsgContext();
MsgAjp msg=new MsgAjp();
msgCtx.setSource( (JkChannel)this );
msgCtx.setWorkerEnv( wEnv );
msgCtx.setNext( this );
msgCtx.setMsg( MSG_NOTE, msg); // XXX Use noteId
C2BConverter c2b=new C2BConverter( "iso-8859-1" );
msgCtx.setConverter( c2b );
MessageBytes tmpMB= MessageBytes.newInstance();
msgCtx.setNote( MB_NOTE, tmpMB );
return msgCtx;
} catch( Exception ex ) {
log.error("Can't create endpoint", ex);
return null;
}
}
public void setNativeAttribute(String name, String val) throws IOException {
if( apr==null ) return;
if( nativeJkHandlerP == 0 ) {
log.error( "Unitialized component " + name+ " " + val );
return;
}
long xEnv=apr.getJkEnv();
apr.jkSetAttribute( xEnv, nativeJkHandlerP, name, val );
apr.releaseJkEnv( xEnv );
}
public void initJkComponent() throws IOException {
if( apr==null ) return;
if( nativeJkHandlerP == 0 ) {
log.error( "Unitialized component " );
return;
}
long xEnv=apr.getJkEnv();
apr.jkInit( xEnv, nativeJkHandlerP );
apr.releaseJkEnv( xEnv );
}
public void destroyJkComponent() throws IOException {
if( apr==null ) return;
if( nativeJkHandlerP == 0 ) {
log.error( "Unitialized component " );
return;
}
long xEnv=apr.getJkEnv();
apr.jkDestroy( xEnv, nativeJkHandlerP );
apr.releaseJkEnv( xEnv );
}
protected void setNativeEndpoint(MsgContext msgCtx) {
long xEnv=apr.getJkEnv();
msgCtx.setJniEnv( xEnv );
long epP=apr.createJkHandler(xEnv, "endpoint");
log.debug("create ep " + epP );
if( epP == 0 ) return;
apr.jkInit( xEnv, epP );
msgCtx.setJniContext( epP );
}
protected void recycleNative(MsgContext ep) {
apr.jkRecycle(ep.getJniEnv(), ep.getJniContext());
}
/** send and get the response in the same buffer. This calls the
* method on the wrapped jk_bean object.
*/
protected int nativeDispatch( Msg msg, MsgContext ep, int code, int raw )
throws IOException
{
if( log.isDebugEnabled() )
log.debug( "Sending packet " + code + " " + raw);
if( raw == 0 ) {
msg.end();
if( log.isTraceEnabled() ) msg.dump("OUT:" );
}
// Create ( or reuse ) the jk_endpoint ( the native pair of
// MsgContext )
long xEnv=ep.getJniEnv();
long nativeContext=ep.getJniContext();
if( nativeContext==0 || xEnv==0 ) {
setNativeEndpoint( ep );
xEnv=ep.getJniEnv();
nativeContext=ep.getJniContext();
}
if( xEnv==0 || nativeContext==0 || nativeJkHandlerP==0 ) {
log.error("invokeNative: Null pointer ");
return -1;
}
// Will process the message in the current thread.
// No wait needed to receive the response, if any
int status=AprImpl.jkInvoke( xEnv,
nativeJkHandlerP,
nativeContext,
code, msg.getBuffer(), 0, msg.getLen(), raw );
if( status != 0 && status != 2 ) {
log.error( "nativeDispatch: error " + status, new Throwable() );
}
if( log.isDebugEnabled() ) log.debug( "Sending packet - done " + status);
return status;
}
/** Base implementation for invoke. Dispatch the action to the native
* code, where invoke() is called on the wrapped jk_bean.
*/
public int invoke(Msg msg, MsgContext ep )
throws IOException
{
long xEnv=ep.getJniEnv();
int type=ep.getType();
int status=nativeDispatch(msg, ep, type, 0 );
apr.jkRecycle(xEnv, ep.getJniContext());
apr.releaseJkEnv( xEnv );
return status;
}
private static org.apache.juli.logging.Log log=
org.apache.juli.logging.LogFactory.getLog( JniHandler.class );
}
