package org.infinispan.commands.write;
import org.infinispan.atomic.CopyableDeltaAware;
import org.infinispan.commons.equivalence.Equivalence;
import org.infinispan.configuration.cache.Configuration;
import org.infinispan.metadata.Metadata;
import org.infinispan.atomic.Delta;
import org.infinispan.atomic.DeltaAware;
import org.infinispan.commands.MetadataAwareCommand;
import org.infinispan.commands.Visitor;
import org.infinispan.container.entries.MVCCEntry;
import org.infinispan.context.Flag;
import org.infinispan.context.InvocationContext;
import org.infinispan.notifications.cachelistener.CacheNotifier;
import java.util.Set;
import static org.infinispan.commons.util.Util.toStr;
/**
* Implements functionality defined by {@link org.infinispan.Cache#put(Object, Object)}
*
* @author Mircea.Markus@jboss.com
* @since 4.0
*/
public class PutKeyValueCommand extends AbstractDataWriteCommand implements MetadataAwareCommand {
public static final byte COMMAND_ID = 8;
Object value;
boolean putIfAbsent;
CacheNotifier notifier;
boolean successful = true;
Metadata metadata;
private ValueMatcher valueMatcher;
private Equivalence valueEquivalence;
public PutKeyValueCommand() {
}
public PutKeyValueCommand(Object key, Object value, boolean putIfAbsent,
CacheNotifier notifier, Metadata metadata, Set<Flag> flags,
Equivalence valueEquivalence) {
super(key, flags);
setValue(value);
this.putIfAbsent = putIfAbsent;
this.valueMatcher = putIfAbsent ? ValueMatcher.MATCH_EXPECTED : ValueMatcher.MATCH_ALWAYS;
this.notifier = notifier;
this.metadata = metadata;
this.valueEquivalence = valueEquivalence;
}
public void init(CacheNotifier notifier, Configuration cfg) {
this.notifier = notifier;
this.valueEquivalence = cfg.dataContainer().valueEquivalence();
}
public Object getValue() {
return value;
}
public void setValue(Object value) {
this.value = value;
if (value instanceof DeltaAware) {
setFlags(Flag.DELTA_WRITE);
}
}
@Override
public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable {
return visitor.visitPutKeyValueCommand(ctx, this);
}
@Override
public Object perform(InvocationContext ctx) throws Throwable {
// It's not worth looking up the entry if we're never going to apply the change.
if (valueMatcher == ValueMatcher.MATCH_NEVER) {
successful = false;
return null;
}
MVCCEntry e = (MVCCEntry) ctx.lookupEntry(key);
if (e == null && hasFlag(Flag.PUT_FOR_EXTERNAL_READ)) {
successful = false;
return null;
}
//possible as in certain situations (e.g. when locking delegation is used) we don't wrap
if (e == null) return null;
Object entryValue = e.getValue();
if (!valueMatcher.matches(e, null, value, valueEquivalence)) {
successful = false;
return entryValue;
}
return performPut(e, ctx);
}
@Override
public byte getCommandId() {
return COMMAND_ID;
}
@Override
public Object[] getParameters() {
return new Object[]{key, value, metadata, putIfAbsent, valueMatcher, Flag.copyWithoutRemotableFlags(flags)};
}
@Override
@SuppressWarnings("unchecked")
public void setParameters(int commandId, Object[] parameters) {
if (commandId != COMMAND_ID) throw new IllegalStateException("Invalid method id");
key = parameters[0];
value = parameters[1];
metadata = (Metadata) parameters[2];
putIfAbsent = (Boolean) parameters[3];
valueMatcher = (ValueMatcher) parameters[4];
flags = (Set<Flag>) parameters[5];
}
@Override
public Metadata getMetadata() {
return metadata;
}
@Override
public void setMetadata(Metadata metadata) {
this.metadata = metadata;
}
public boolean isPutIfAbsent() {
return putIfAbsent;
}
public void setPutIfAbsent(boolean putIfAbsent) {
this.putIfAbsent = putIfAbsent;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
PutKeyValueCommand that = (PutKeyValueCommand) o;
if (putIfAbsent != that.putIfAbsent) return false;
if (value != null ? !value.equals(that.value) : that.value != null) return false;
if (metadata != null ? !metadata.equals(that.metadata) : that.metadata != null) return false;
return true;
}
@Override
public int hashCode() {
int result = super.hashCode();
result = 31 * result + (value != null ? value.hashCode() : 0);
result = 31 * result + (putIfAbsent ? 1 : 0);
result = 31 * result + (metadata != null ? metadata.hashCode() : 0);
return result;
}
@Override
public String toString() {
return new StringBuilder()
.append("PutKeyValueCommand{key=")
.append(toStr(key))
.append(", value=").append(toStr(value))
.append(", flags=").append(flags)
.append(", putIfAbsent=").append(putIfAbsent)
.append(", valueMatcher=").append(valueMatcher)
.append(", metadata=").append(metadata)
.append(", successful=").append(successful)
.append("}")
.toString();
}
@Override
public boolean isSuccessful() {
return successful;
}
@Override
public boolean isConditional() {
return putIfAbsent;
}
@Override
public ValueMatcher getValueMatcher() {
return valueMatcher;
}
@Override
public void setValueMatcher(ValueMatcher valueMatcher) {
this.valueMatcher = valueMatcher;
}
@Override
public void updateStatusFromRemoteResponse(Object remoteResponse) {
// Only putIfAbsent commands can fail
if (putIfAbsent) {
successful = remoteResponse == null;
}
}
private Object performPut(MVCCEntry e, InvocationContext ctx) {
Object entryValue = e.getValue();
Object o;
if (!e.isCreated()) {
notifier.notifyCacheEntryModified(key, value, entryValue, e.getMetadata(), true, ctx, this);
}
if (value instanceof Delta) {
// magic
Delta dv = (Delta) value;
DeltaAware toMergeWith = null;
if (entryValue instanceof CopyableDeltaAware) {
toMergeWith = ((CopyableDeltaAware) entryValue).copy();
} else if (entryValue instanceof DeltaAware) {
toMergeWith = (DeltaAware) entryValue;
}
e.setValue(dv.merge(toMergeWith));
o = entryValue;
} else {
o = e.setValue(value);
if (e.isRemoved()) {
e.setRemoved(false);
e.setValid(true);
o = null;
}
}
e.setChanged(true);
// Return the expected value when retrying a putIfAbsent command (i.e. null)
return valueMatcher != ValueMatcher.MATCH_EXPECTED_OR_NEW ? o : null;
}
}