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 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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// Portions Copyright [2018-2021] [Payara Foundation and/or its affiliates]

package com.sun.ejb.containers;

import com.sun.ejb.EjbInvocation;
import com.sun.ejb.containers.StatefulSessionContainer.EEMRefInfo;
import com.sun.ejb.spi.container.StatefulEJBContext;
import com.sun.enterprise.container.common.impl.PhysicalEntityManagerWrapper;
import com.sun.enterprise.deployment.EjbSessionDescriptor;

import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import jakarta.ejb.SessionContext;
import jakarta.ejb.TimerService;
import jakarta.persistence.EntityManagerFactory;

import org.glassfish.api.invocation.ComponentInvocation;

/**
 * Implementation of EJBContext for SessionBeans
 *
 * @author Mahesh Kannan
 */
public final class SessionContextImpl extends AbstractSessionContextImpl implements StatefulEJBContext {

    private static final long serialVersionUID = -559621200233337728L;

    private boolean completedTxStatus;
    private boolean afterCompletionDelayed = false;
    private boolean committing = false;
    private boolean inAfterCompletion = false;
    private boolean isStateless = false;
    private boolean isStateful = false;

    private boolean existsInSessionStore = false;
    private transient int refCount = 0;

    private boolean txCheckpointDelayed;
    private long lastPersistedAt;

    private long version;

    // Do not call Session Synchronization callbacks when in transactional
    // lifecycle callbacks
    private boolean inLifeCycleCallback = false;

    // Map of entity managers with extended persistence context
    // for this stateful session bean.
    private transient Map extendedEntityManagerMap;

    private transient Set emfsRegisteredWithTx;

    // Used during activation to populate entries in the above maps
    // Also, EEMRefInfo implements IndirectlySerializable
    private Collection eemRefInfos = new HashSet<>();

    // Used to provide serialized access to an SFSB instance.
    private transient ReentrantReadWriteLock statefulSerializedAccessLock;

    SessionContextImpl(Object ejb, BaseContainer container) {
        super(ejb, container);
        EjbSessionDescriptor sessionDesc = (EjbSessionDescriptor) getContainer().getEjbDescriptor();
        isStateless = sessionDesc.isStateless();
        isStateful = sessionDesc.isStateful();
        if (isStateful) {
            initializeStatefulWriteLock();
        }
    }

    public Map getExtendedEntityManagerMap() {
        if( extendedEntityManagerMap == null ) {
            extendedEntityManagerMap = new HashMap<>();
        }
        return extendedEntityManagerMap;
    }

    Collection getAllEEMRefInfos() {
        return eemRefInfos;
    }

    void setEEMRefInfos(Collection val) {
        if (val != null) {
            eemRefInfos = val;
        }
    }

    public void addExtendedEntityManagerMapping(EntityManagerFactory emf, EEMRefInfo refInfo) {
        getExtendedEntityManagerMap().put(emf,
            new PhysicalEntityManagerWrapper(refInfo.getEntityManager(), refInfo.getSynchronizationType()));
    }

    public PhysicalEntityManagerWrapper getExtendedEntityManager(EntityManagerFactory emf) {
        return getExtendedEntityManagerMap().get(emf);
    }

    public Collection getExtendedEntityManagers() {
        return getExtendedEntityManagerMap().values();
    }

    private Set getEmfsRegisteredWithTx() {
        if (emfsRegisteredWithTx == null) {
            emfsRegisteredWithTx = new HashSet<>();
        }
        return emfsRegisteredWithTx;
    }

    public void setEmfRegisteredWithTx(EntityManagerFactory emf, boolean flag) {
        if (flag) {
            getEmfsRegisteredWithTx().add(emf);
        } else {
            getEmfsRegisteredWithTx().remove(emf);
        }
    }

    public boolean isEmfRegisteredWithTx(EntityManagerFactory emf) {
        return getEmfsRegisteredWithTx().contains(emf);
    }

    public void initializeStatefulWriteLock() {
        statefulSerializedAccessLock = new ReentrantReadWriteLock(true);
    }

    public ReentrantReadWriteLock.WriteLock getStatefulWriteLock() {
        return statefulSerializedAccessLock.writeLock();
    }

    public void setStatefulWriteLock(SessionContextImpl other) {
        statefulSerializedAccessLock = other.statefulSerializedAccessLock;
    }

    @Override
    public TimerService getTimerService() throws IllegalStateException {
        if (isStateful) {
            throw new IllegalStateException("EJBTimer Service is not accessible to Stateful Session ejbs");
        }

        // Instance key is first set between after setSessionContext and
        // before ejbCreate
        if (getInstanceKey() == null) {
            throw new IllegalStateException("Operation not allowed");
        }

        return EJBTimerService.getEJBTimerServiceWrapper(this);
    }

    @Override
    protected void checkAccessToCallerSecurity() throws IllegalStateException {

        if (isStateless) {
            // This covers constructor, setSessionContext, ejbCreate,
            // and ejbRemove. NOTE : For stateless session beans,
            // instances don't move past CREATED until after ejbCreate.
            if (state == BeanState.CREATED || inEjbRemove) {
                throw new IllegalStateException("Operation not allowed");
            }
        } else {
            // This covers constructor and setSessionContext.
            // For stateful session beans, instances move past
            // CREATED after setSessionContext.
            if (state == BeanState.CREATED) {
                throw new IllegalStateException("Operation not allowed");
            }
        }

    }

    @Override
    public void checkTimerServiceMethodAccess() throws IllegalStateException {
        // checks that only apply to stateful session beans
        ComponentInvocation compInv = getCurrentComponentInvocation();
        if (isStateful) {
            if (inStatefulSessionEjbCreate(compInv) || inActivatePassivate(compInv) || inAfterCompletion) {
                throw new IllegalStateException(
                    "EJB Timer methods for stateful session beans cannot be " + " called in this context");
            }
        }

        // checks that apply to both stateful AND stateless
        if (state == BeanState.CREATED || inEjbRemove) {
            throw new IllegalStateException("EJB Timer method calls cannot be called in this context");
        }
    }

    boolean getCompletedTxStatus() {
        return completedTxStatus;
    }

    void setCompletedTxStatus(boolean s) {
        this.completedTxStatus = s;
    }

    boolean isAfterCompletionDelayed() {
        return afterCompletionDelayed;
    }

    void setAfterCompletionDelayed(boolean s) {
        this.afterCompletionDelayed = s;
    }

    boolean isTxCompleting() {
        return committing;
    }

    void setTxCompleting(boolean s) {
        this.committing = s;
    }

    void setInAfterCompletion(boolean flag) {
        inAfterCompletion = flag;
    }

    void setInLifeCycleCallback(boolean s) {
        inLifeCycleCallback = s;
    }

    boolean getInLifeCycleCallback() {
        return inLifeCycleCallback;
    }

    // Used to check if stateful session bean is in ejbCreate.
    // Since bean goes to READY state before ejbCreate is called by
    // EJBHomeImpl and EJBLocalHomeImpl, we can't rely on getState()
    // being CREATED for operations matrix checks.
    private boolean inStatefulSessionEjbCreate(ComponentInvocation inv) {
        if (inv instanceof EjbInvocation) {
            final EjbInvocation ejbInv = (EjbInvocation) inv;
            // If call came through a home/local-home, this can only be create call.
            return ejbInv.isHome
                && ejbInv.isClientInterfaceAssignableToOneOf(jakarta.ejb.EJBHome.class, jakarta.ejb.EJBLocalHome.class);
        }
        return false;
    }

    void setTxCheckpointDelayed(boolean val) {
        this.txCheckpointDelayed = val;
    }

    boolean isTxCheckpointDelayed() {
        return this.txCheckpointDelayed;
    }

    long getLastPersistedAt() {
        return lastPersistedAt;
    }

    void setLastPersistedAt(long val) {
        this.lastPersistedAt = val;
    }

    @Override
    public long getVersion() {
        return version;
    }

    @Override
    public long incrementAndGetVersion() {
        return ++version;
    }

    @Override
    public void setVersion(long newVersion) {
        this.version = newVersion;
    }

    /*************************************************************************/
    /************ Implementation of StatefulEJBContext ***********************/
    /*************************************************************************/

    @Override
    public long getLastAccessTime() {
        return getLastTimeUsed();
    }

    @Override
    public boolean canBePassivated() {
        return state == EJBContextImpl.BeanState.READY;
    }

    public boolean hasExtendedPC() {
        return !this.getExtendedEntityManagerMap().isEmpty();
    }

    @Override
    public SessionContext getSessionContext() {
        return this;
    }

    @Override
    public boolean existsInStore() {
        return existsInSessionStore ;
    }

    @Override
    public void setExistsInStore(boolean val) {
        this.existsInSessionStore = val;
    }

    public void incrementRefCount() {
        refCount++;
    }

    public void decrementRefCount() {
        refCount--;
    }

    public int getRefCount() {
        return refCount;
    }
}