package org.infinispan.interceptors.totalorder;
import java.util.ArrayList;
import org.infinispan.commands.FlagAffectedCommand;
import org.infinispan.commands.tx.CommitCommand;
import org.infinispan.commands.tx.PrepareCommand;
import org.infinispan.commands.tx.VersionedPrepareCommand;
import org.infinispan.container.entries.CacheEntry;
import org.infinispan.container.entries.VersionedRepeatableReadEntry;
import org.infinispan.container.versioning.EntryVersion;
import org.infinispan.container.versioning.EntryVersionsMap;
import org.infinispan.container.versioning.IncrementableEntryVersion;
import org.infinispan.context.Flag;
import org.infinispan.context.InvocationContext;
import org.infinispan.context.impl.TxInvocationContext;
import org.infinispan.interceptors.impl.VersionedEntryWrappingInterceptor;
import org.infinispan.metadata.EmbeddedMetadata;
import org.infinispan.metadata.Metadata;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* Wrapping Interceptor for Total Order protocol when versions are needed
*
* @author Mircea.Markus@jboss.com
* @author Pedro Ruivo
*/
public class TotalOrderVersionedEntryWrappingInterceptor extends VersionedEntryWrappingInterceptor {
private static final Log log = LogFactory.getLog(TotalOrderVersionedEntryWrappingInterceptor.class);
private static final boolean trace = log.isTraceEnabled();
private static final EntryVersionsMap EMPTY_VERSION_MAP = new EntryVersionsMap();
@Override
public final Object visitPrepareCommand(TxInvocationContext ctx, PrepareCommand command) throws Throwable {
if (ctx.isOriginLocal()) {
((VersionedPrepareCommand) command).setVersionsSeen(ctx.getCacheTransaction().getVersionsRead());
//for local mode keys
ctx.getCacheTransaction().setUpdatedEntryVersions(EMPTY_VERSION_MAP);
return invokeNextThenAccept(ctx, command, (rCtx, rCommand, rv) -> {
if (shouldCommitDuringPrepare((PrepareCommand) rCommand, ctx)) {
commitContextEntries(ctx, null, null);
}
});
}
//Remote context, delivered in total order
wrapEntriesForPrepare(ctx, command);
return invokeNextThenApply(ctx, command, (rCtx, rCommand, rv) -> {
TxInvocationContext txInvocationContext = (TxInvocationContext) rCtx;
VersionedPrepareCommand prepareCommand = (VersionedPrepareCommand) rCommand;
EntryVersionsMap versionsMap =
cdl.createNewVersionsAndCheckForWriteSkews(versionGenerator, txInvocationContext,
prepareCommand);
if (prepareCommand.isOnePhaseCommit()) {
commitContextEntries(txInvocationContext, null, null);
} else {
if (trace)
log.tracef("Transaction %s will be committed in the 2nd phase",
txInvocationContext.getGlobalTransaction().globalId());
}
return versionsMap == null ? rv : new ArrayList<Object>(versionsMap.keySet());
});
}
@Override
public Object visitCommitCommand(TxInvocationContext ctx, CommitCommand command) throws Throwable {
return invokeNextAndFinally(ctx, command, (rCtx, rCommand, rv, t) -> commitContextEntries(rCtx, null, null));
}
@Override
protected void commitContextEntry(CacheEntry entry, InvocationContext ctx, FlagAffectedCommand command,
Metadata metadata, Flag stateTransferFlag, boolean l1Invalidation) {
if (ctx.isInTxScope() && stateTransferFlag == null) {
Metadata commitMetadata;
// If user provided version, use it, otherwise generate/increment accordingly
VersionedRepeatableReadEntry clusterMvccEntry = (VersionedRepeatableReadEntry) entry;
EntryVersion existingVersion = clusterMvccEntry.getMetadata().version();
EntryVersion newVersion;
if (existingVersion == null) {
newVersion = versionGenerator.generateNew();
} else {
newVersion = versionGenerator.increment((IncrementableEntryVersion) existingVersion);
}
if (metadata == null)
commitMetadata = new EmbeddedMetadata.Builder().version(newVersion).build();
else
commitMetadata = metadata.builder().version(newVersion).build();
cdl.commitEntry(entry, commitMetadata, command, ctx, null, l1Invalidation);
} else {
// This could be a state transfer call!
cdl.commitEntry(entry, entry.getMetadata(), command, ctx, stateTransferFlag, l1Invalidation);
}
}
}