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// Portions Copyright [2016] [Payara Foundation]
package org.glassfish.api.invocation;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Stack;
import java.util.HashMap;
import java.util.Map;
import org.glassfish.api.invocation.ComponentInvocation.ComponentInvocationType;
import org.jvnet.hk2.annotations.Optional;
import org.jvnet.hk2.annotations.Service;
import javax.inject.Singleton;
import org.glassfish.hk2.api.IterableProvider;
import javax.inject.Inject;
@Service
@Singleton
public class InvocationManagerImpl
implements InvocationManager {
// This TLS variable stores an ArrayList.
// The ArrayList contains ComponentInvocation objects which represent
// the stack of invocations on this thread. Accesses to the ArrayList
// dont need to be synchronized because each thread has its own ArrayList.
private InheritableThreadLocal<InvocationArray<ComponentInvocation>> frames;
private final ThreadLocal<Stack<ApplicationEnvironment>> applicationEnvironments =
new ThreadLocal<Stack<ApplicationEnvironment>>() {
@Override
protected Stack<ApplicationEnvironment> initialValue() {
return new Stack<ApplicationEnvironment>();
}
};
private Map<ComponentInvocationType,List<RegisteredComponentInvocationHandler>> regCompInvHandlerMap
= new HashMap<ComponentInvocationType, List<RegisteredComponentInvocationHandler>>();
private final ComponentInvocationHandler[] invHandlers;
public InvocationManagerImpl() {
this(null);
}
@Inject
private InvocationManagerImpl(@Optional IterableProvider<ComponentInvocationHandler> handlers) {
if (handlers == null) {
invHandlers = null;
}
else {
LinkedList<ComponentInvocationHandler> localHandlers = new LinkedList<ComponentInvocationHandler>();
for (ComponentInvocationHandler handler : handlers) {
localHandlers.add(handler);
}
if (localHandlers.size() > 0) {
invHandlers = localHandlers.toArray(new ComponentInvocationHandler[localHandlers.size()]);
}
else {
invHandlers = null;
}
}
frames = new InheritableThreadLocal<InvocationArray<ComponentInvocation>>() {
protected InvocationArray initialValue() {
return new InvocationArray();
}
// if this is a thread created by user in servlet's service method
// create a new ComponentInvocation with transaction
// set to null and instance set to null
// so that the resource won't be enlisted or registered
protected InvocationArray<ComponentInvocation> childValue(InvocationArray<ComponentInvocation> parentValue) {
// always creates a new ArrayList
InvocationArray<ComponentInvocation> result = new InvocationArray<ComponentInvocation>();
InvocationArray<ComponentInvocation> v = parentValue;
if (v.size() > 0 && v.outsideStartup()) {
// get current invocation
ComponentInvocation parentInv = v.get(v.size() - 1);
/*
TODO: The following is ugly. The logic of what needs to be in the
new ComponentInvocation should be with the respective container
*/
if (parentInv.getInvocationType() == ComponentInvocationType.SERVLET_INVOCATION) {
ComponentInvocation inv = new ComponentInvocation();
inv.componentId = parentInv.getComponentId();
inv.setComponentInvocationType(parentInv.getInvocationType());
inv.instance = null;
inv.container = parentInv.getContainerContext();
inv.transaction = null;
result.add(inv);
} else if (parentInv.getInvocationType() != ComponentInvocationType.EJB_INVOCATION) {
// Push a copy of invocation onto the new result
// ArrayList
ComponentInvocation cpy = new ComponentInvocation();
cpy.componentId = parentInv.getComponentId();
cpy.setComponentInvocationType(parentInv.getInvocationType());
cpy.instance = parentInv.getInstance();
cpy.container = parentInv.getContainerContext();
cpy.transaction = parentInv.getTransaction();
result.add(cpy);
}
}
return result;
}
};
}
public <T extends ComponentInvocation> void preInvoke(T inv)
throws InvocationException {
InvocationArray<ComponentInvocation> v = frames.get();
if (inv.getInvocationType() == ComponentInvocationType.SERVICE_STARTUP) {
v.setInvocationAttribute(ComponentInvocationType.SERVICE_STARTUP);
return;
}
int beforeSize = v.size();
ComponentInvocation prevInv = beforeSize > 0 ? v.get(beforeSize - 1) : null;
// if ejb call EJBSecurityManager, for servlet call RealmAdapter
ComponentInvocationType invType = inv.getInvocationType();
if (invHandlers != null) {
for (ComponentInvocationHandler handler : invHandlers) {
handler.beforePreInvoke(invType, prevInv, inv);
}
}
List<RegisteredComponentInvocationHandler> setCIH = regCompInvHandlerMap.get(invType);
if (setCIH != null) {
for (int i=0;i<setCIH.size();i++) {
setCIH.get(i).getComponentInvocationHandler().beforePreInvoke(invType, prevInv, inv);
}
}
//push this invocation on the stack
v.add(inv);
if (invHandlers != null) {
for (ComponentInvocationHandler handler : invHandlers) {
handler.afterPreInvoke(invType, prevInv, inv);
}
}
if (setCIH != null) {
for (int i=0;i<setCIH.size();i++) {
setCIH.get(i).getComponentInvocationHandler().afterPreInvoke(invType, prevInv, inv);
}
}
}
public <T extends ComponentInvocation> void postInvoke(T inv)
throws InvocationException {
// Get this thread's ArrayList
InvocationArray<ComponentInvocation> v = frames.get();
if (inv.getInvocationType() == ComponentInvocationType.SERVICE_STARTUP) {
v.setInvocationAttribute(ComponentInvocationType.UN_INITIALIZED);
return;
}
int beforeSize = v.size();
if (beforeSize == 0) {
throw new InvocationException();
}
ComponentInvocation prevInv = beforeSize > 1 ? v.get(beforeSize - 2) : null;
ComponentInvocation curInv = v.get(beforeSize - 1);
try {
ComponentInvocationType invType = inv.getInvocationType();
if (invHandlers != null) {
for (ComponentInvocationHandler handler : invHandlers) {
handler.beforePostInvoke(invType, prevInv, curInv);
}
}
List<RegisteredComponentInvocationHandler> setCIH = regCompInvHandlerMap.get(invType);
if (setCIH != null) {
for (int i=0;i<setCIH.size();i++) {
setCIH.get(i).getComponentInvocationHandler().beforePostInvoke(invType, prevInv, curInv);
}
}
} finally {
// pop the stack
v.remove(beforeSize - 1);
if (invHandlers != null) {
for (ComponentInvocationHandler handler : invHandlers) {
handler.afterPostInvoke(inv.getInvocationType(), prevInv, inv);
}
}
ComponentInvocationType invType = inv.getInvocationType();
List<RegisteredComponentInvocationHandler> setCIH = regCompInvHandlerMap.get(invType);
if (setCIH != null) {
for (int i=0;i<setCIH.size();i++) {
setCIH.get(i).getComponentInvocationHandler().afterPostInvoke(invType, prevInv, curInv);
}
}
}
}
/**
* return true iff no invocations on the stack for this thread
*/
public boolean isInvocationStackEmpty() {
ArrayList v = frames.get();
return ((v == null) || (v.size() == 0));
}
/**
* return the Invocation object of the component
* being called
*/
public <T extends ComponentInvocation> T getCurrentInvocation() {
ArrayList v = (ArrayList) frames.get();
int size = v.size();
if (size == 0) {
return null;
}
return (T) v.get(size - 1);
}
/**
* return the Inovcation object of the caller
* return null if none exist (e.g. caller is from
* another VM)
*/
public <T extends ComponentInvocation> T getPreviousInvocation()
throws InvocationException {
ArrayList v = frames.get();
int i = v.size();
if (i < 2) return null;
return (T) v.get(i - 2);
}
@Override
public List getAllInvocations() {
return frames.get();
}
@Override
public List<? extends ComponentInvocation> popAllInvocations() {
List<? extends ComponentInvocation> result = frames.get();
frames.set(null);
return result;
}
@Override
public void putAllInvocations(List<? extends ComponentInvocation> invocations) {
frames.set(new InvocationArray<>((List<ComponentInvocation>) invocations));
}
static class InvocationArray<T extends ComponentInvocation> extends java.util.ArrayList<T> {
private ComponentInvocationType invocationAttribute;
private InvocationArray(List<T> invocations) {
super(invocations);
}
private InvocationArray() {
}
public void setInvocationAttribute(ComponentInvocationType attribute) {
this.invocationAttribute = attribute;
}
public ComponentInvocationType getInvocationAttribute() {
return invocationAttribute;
}
public boolean outsideStartup() {
return getInvocationAttribute()
!= ComponentInvocationType.SERVICE_STARTUP;
}
}
public void registerComponentInvocationHandler(ComponentInvocationType type, RegisteredComponentInvocationHandler handler) {
List<RegisteredComponentInvocationHandler> setRegCompInvHandlers = regCompInvHandlerMap.get(type);
if (setRegCompInvHandlers == null) {
setRegCompInvHandlers = new ArrayList<RegisteredComponentInvocationHandler>();
regCompInvHandlerMap.put(type, setRegCompInvHandlers);
}
if (setRegCompInvHandlers.size() == 0) {
setRegCompInvHandlers.add(handler);
}
}
@Override
public void pushAppEnvironment(ApplicationEnvironment env) {
Stack<ApplicationEnvironment> stack = applicationEnvironments.get();
stack.push(env);
}
@Override
public ApplicationEnvironment peekAppEnvironment() {
Stack<ApplicationEnvironment> stack = applicationEnvironments.get();
if (stack.isEmpty()) return null;
return stack.peek();
}
@Override
public void popAppEnvironment() {
Stack<ApplicationEnvironment> stack = applicationEnvironments.get();
if (!stack.isEmpty()) stack.pop();
}
}