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

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Infinispan Embedded All-in-One module

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package org.infinispan.commands.functional;

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

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

import org.infinispan.commands.Visitor;
import org.infinispan.commands.read.AbstractDataCommand;
import org.infinispan.functional.EntryView.ReadEntryView;
import org.infinispan.commons.util.EnumUtil;
import org.infinispan.container.entries.CacheEntry;
import org.infinispan.context.InvocationContext;
import org.infinispan.functional.impl.EntryViews;
import org.infinispan.functional.impl.Params;

public class ReadOnlyKeyCommand extends AbstractDataCommand {

   public static final int COMMAND_ID = 62;
   protected Function, R> f;
   protected Params params;

   public ReadOnlyKeyCommand(Object key, Function, R> f, Params params) {
      super(key, EnumUtil.EMPTY_BIT_SET);
      this.f = f;
      this.params = params;
      this.setFlagsBitSet(params.toFlagsBitSet());
   }

   public ReadOnlyKeyCommand() {
   }

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

   @Override
   public void writeTo(ObjectOutput output) throws IOException {
      output.writeObject(key);
      output.writeObject(f);
      Params.writeObject(output, params);
   }

   @Override
   public void readFrom(ObjectInput input) throws IOException, ClassNotFoundException {
      key = input.readObject();
      f = (Function, R>) input.readObject();
      params = Params.readObject(input);
      this.setFlagsBitSet(params.toFlagsBitSet());
   }

   // Not really invoked unless in local mode
   @Override
   public Object perform(InvocationContext ctx) throws Throwable {
      CacheEntry entry = ctx.lookupEntry(key);

      if (entry == null) {
         throw new IllegalStateException();
      }

      ReadEntryView ro = entry.isNull() ? EntryViews.noValue((K) key) : EntryViews.readOnly(entry);
      R ret = f.apply(ro);
      return snapshot(ret);
   }

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

   @Override
   public LoadType loadType() {
      return LoadType.OWNER;
   }

   /**
    * Apply function on entry without any data
    */
   public Object performOnLostData() {
      return f.apply(EntryViews.noValue((K) key));
   }

   @Override
   public String toString() {
      return "ReadOnlyKeyCommand{" +
            "key=" + key +
            ", f=" + f +
            '}';
   }
}