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package com.sun.ejb.containers;

import java.io.Serializable;
import java.util.ArrayList;

import java.util.logging.*;

import com.sun.logging.*;
import org.glassfish.ha.store.api.BackingStore;
import org.glassfish.ha.store.api.BackingStoreException;
import org.glassfish.ha.store.util.SimpleMetadata;

/**
 * A class to checkpoint HA enabled SFSBs as a single transactional unit.
 *
 * @author Mahesh Kannan
 */
public class SFSBTxCheckpointCoordinator {

    private static final Logger _logger =
            LogDomains.getLogger(SFSBTxCheckpointCoordinator.class, LogDomains.EJB_LOGGER);

    private String haStoreType;

    private ArrayList ctxList = new ArrayList();

    SFSBTxCheckpointCoordinator(String haStoreType) {
        this.haStoreType = haStoreType;
    }

    void registerContext(SessionContextImpl ctx) {
        ctxList.add(ctx);
    }

    void doTxCheckpoint() {
        SessionContextImpl[] contexts = (SessionContextImpl[]) ctxList.toArray(
                new SessionContextImpl[ctxList.size()]);
        int size = contexts.length;
        ArrayList states = new ArrayList(size);

        for (int i = 0; i < size; i++) {
            SessionContextImpl ctx = contexts[i];
            StatefulSessionContainer container =
                    (StatefulSessionContainer) ctx.getContainer();
            SimpleMetadata beanState = container.getSFSBBeanState(ctx);
            if (beanState != null) {
                states.add(new StoreAndBeanState((Serializable) ctx.getInstanceKey(),
                        container.getBackingStore(), beanState, !ctx.existsInStore()));
            }
        }

        if (states.size() > 0) {
            StoreAndBeanState[] beanStates = states.toArray(new StoreAndBeanState[states.size()]);

            try {
                for (StoreAndBeanState st : states) {
                    st.store.save(st.key, st.state, st.isNew);
                }
            } catch (BackingStoreException sfsbEx) {
                _logger.log(Level.WARNING, "Exception during checkpointSave",
                        sfsbEx);
            } catch (Throwable th) {
                _logger.log(Level.WARNING, "Exception during checkpointSave",
                        th);
            }
        }

        for (int i = 0; i < size; i++) {
            SessionContextImpl ctx = contexts[i];
            StatefulSessionContainer container =
                    (StatefulSessionContainer) ctx.getContainer();
            container.txCheckpointCompleted(ctx);
        }
    }

    private static final class StoreAndBeanState {
        Serializable key;
        BackingStore store;
        SimpleMetadata state;
        boolean isNew;

        StoreAndBeanState(Serializable key,
                          BackingStore store, SimpleMetadata state,
                          boolean isNew) {
            this.key = key;
            this.store = store;
            this.state = state;
            this.isNew = isNew;
        }
    }

}