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* Copyright 2004 The Apache Software Foundation
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package com.sun.grizzly.http.jk.common;
import com.sun.grizzly.util.LoggerUtils;
import java.io.IOException;
import javax.management.ObjectName;
import com.sun.grizzly.http.jk.apr.AprImpl;
import com.sun.grizzly.http.jk.core.JkChannel;
import com.sun.grizzly.http.jk.core.JkHandler;
import com.sun.grizzly.http.jk.core.Msg;
import com.sun.grizzly.http.jk.core.MsgContext;
import com.sun.grizzly.util.buf.ByteChunk;
import com.sun.grizzly.util.buf.C2BConverter;
import com.sun.grizzly.util.buf.MessageBytes;
import java.util.logging.Level;
import org.apache.commons.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) {
LoggerUtils.getLogger().log(Level.FINEST, "Can't load apr", t);
apr = null;
}
}
if (apr == null || !apr.isLoaded()) {
if (LoggerUtils.getLogger().isLoggable(Level.FINEST)) {
LoggerUtils.getLogger().log(Level.FINEST, "No apr, disabling jni proxy ");
}
apr = null;
return;
}
try {
long xEnv = apr.getJkEnv();
nativeJkHandlerP = apr.getJkHandler(xEnv, nativeComponentName);
if (nativeJkHandlerP == 0) {
LoggerUtils.getLogger().log(Level.FINEST, "Component not found, creating it " + nativeComponentName);
nativeJkHandlerP = apr.createJkHandler(xEnv, nativeComponentName);
}
LoggerUtils.getLogger().log(Level.FINEST, "Native proxy " + nativeJkHandlerP);
apr.releaseJkEnv(xEnv);
} catch (Throwable t) {
apr = null;
}
}
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) {
LoggerUtils.getLogger().log(Level.SEVERE, "Can't create endpoint", ex);
return null;
}
}
public void setNativeAttribute(String name, String val) throws IOException {
if (apr == null) {
return;
}
if (nativeJkHandlerP == 0) {
LoggerUtils.getLogger().log(Level.SEVERE, "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) {
LoggerUtils.getLogger().log(Level.SEVERE, "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) {
LoggerUtils.getLogger().log(Level.SEVERE, "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");
LoggerUtils.getLogger().log(Level.FINEST, "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 (LoggerUtils.getLogger().isLoggable(Level.FINEST)) {
LoggerUtils.getLogger().log(Level.FINEST, "Sending packet " + code + " " + raw);
}
if (raw == 0) {
msg.end();
}
// 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) {
LoggerUtils.getLogger().log(Level.SEVERE, "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) {
LoggerUtils.getLogger().log(Level.SEVERE, "nativeDispatch: error " + status, new Throwable());
}
if (LoggerUtils.getLogger().isLoggable(Level.FINEST)) {
LoggerUtils.getLogger().log(Level.FINEST, "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;
}
}
