org.infinispan.commands.functional.ReadWriteKeyCommand Maven / Gradle / Ivy

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package org.infinispan.commands.functional;

import org.infinispan.commands.CommandInvocationId;
import org.infinispan.commands.Visitor;
import org.infinispan.commands.write.ValueMatcher;
import org.infinispan.commons.api.functional.EntryView.ReadWriteEntryView;
import org.infinispan.commons.marshall.MarshallUtil;
import org.infinispan.container.entries.CacheEntry;
import org.infinispan.context.Flag;
import org.infinispan.context.InvocationContext;
import org.infinispan.functional.impl.EntryViews;
import org.infinispan.functional.impl.Params;

import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Set;
import java.util.function.Function;

import static org.infinispan.functional.impl.EntryViews.snapshot;

public final class ReadWriteKeyCommand extends AbstractWriteKeyCommand {

   public static final byte COMMAND_ID = 50;

   private Function, R> f;

   public ReadWriteKeyCommand(K key, Function, R> f,
         CommandInvocationId id, ValueMatcher valueMatcher, Params params) {
      super(key, valueMatcher, id, params);
      this.f = f;
   }

   public ReadWriteKeyCommand() {
      // No-op, for marshalling
   }

   @Override
   public byte getCommandId() {
      return COMMAND_ID;
   }

   @Override
   public void writeTo(ObjectOutput output) throws IOException {
      output.writeObject(key);
      output.writeObject(f);
      MarshallUtil.marshallEnum(valueMatcher, output);
      output.writeObject(Flag.copyWithoutRemotableFlags(flags));
      output.writeObject(commandInvocationId);
   }

   @Override
   public void readFrom(ObjectInput input) throws IOException, ClassNotFoundException {
      key = input.readObject();
      f = (Function, R>) input.readObject();
      valueMatcher = MarshallUtil.unmarshallEnum(input, ValueMatcher::valueOf);
      flags = (Set) input.readObject();
      commandInvocationId = (CommandInvocationId) input.readObject();
   }

   @Override
   public boolean isConditional() {
      return true;
   }

   @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;
      }

      CacheEntry e = ctx.lookupEntry(key);

      // Could be that the key is not local, 'null' is how this is signalled
      if (e == null) return null;

      R ret = f.apply(EntryViews.readWrite(e));
      return snapshot(ret);
   }

   @Override
   public void updateStatusFromRemoteResponse(Object remoteResponse) {
      // TODO: Customise this generated block
   }

   @Override
   public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable {
      return visitor.visitReadWriteKeyCommand(ctx, this);
   }

   @Override
   public boolean readsExistingValues() {
      return true;
   }

   @Override
   public boolean alwaysReadsExistingValues() {
      return false;
   }
}