CavalliumDBEngine/src/main/java/it/cavallium/dbengine/database/LLEntry.java
2022-03-16 13:47:56 +01:00

165 lines
3.7 KiB
Java

package it.cavallium.dbengine.database;
import io.netty5.buffer.api.Buffer;
import io.netty5.buffer.api.Drop;
import io.netty5.buffer.api.Owned;
import io.netty5.buffer.api.Resource;
import io.netty5.buffer.api.Send;
import io.netty5.buffer.api.internal.ResourceSupport;
import java.util.Objects;
import java.util.StringJoiner;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
public class LLEntry extends ResourceSupport<LLEntry, LLEntry> {
private static final Logger logger = LogManager.getLogger(LLEntry.class);
private static final Drop<LLEntry> DROP = new Drop<>() {
@Override
public void drop(LLEntry obj) {
try {
if (obj.key != null) {
obj.key.close();
}
} catch (Throwable ex) {
logger.error("Failed to close key", ex);
}
try {
if (obj.value != null) {
obj.value.close();
}
} catch (Throwable ex) {
logger.error("Failed to close value", ex);
}
}
@Override
public Drop<LLEntry> fork() {
return this;
}
@Override
public void attach(LLEntry obj) {
}
};
@Nullable
private Buffer key;
@Nullable
private Buffer value;
private LLEntry(@NotNull Send<Buffer> key, @NotNull Send<Buffer> value) {
super(DROP);
this.key = key.receive().makeReadOnly();
this.value = value.receive().makeReadOnly();
assert isAllAccessible();
}
private LLEntry(@NotNull Buffer key, @NotNull Buffer value) {
super(DROP);
this.key = key.makeReadOnly();
this.value = value.makeReadOnly();
assert isAllAccessible();
}
private boolean isAllAccessible() {
assert key != null && key.isAccessible();
assert value != null && value.isAccessible();
assert this.isAccessible();
assert this.isOwned();
return true;
}
public static LLEntry of(@NotNull Send<Buffer> key, @NotNull Send<Buffer> value) {
return new LLEntry(key, value);
}
public static LLEntry of(@NotNull Buffer key, @NotNull Buffer value) {
return new LLEntry(key, value);
}
public Send<Buffer> getKey() {
ensureOwned();
return Objects.requireNonNull(key).copy().send();
}
public Buffer getKeyUnsafe() {
return key;
}
public Send<Buffer> getValue() {
ensureOwned();
return Objects.requireNonNull(value).copy().send();
}
public Buffer getValueUnsafe() {
return value;
}
private void ensureOwned() {
assert isAllAccessible();
if (!isOwned()) {
if (!isAccessible()) {
throw this.createResourceClosedException();
} else {
throw new IllegalStateException("Resource not owned");
}
}
}
@Override
protected void makeInaccessible() {
this.key = null;
this.value = null;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
LLEntry LLEntry = (LLEntry) o;
return LLUtils.equals(key, LLEntry.key) && LLUtils.equals(value, LLEntry.value);
}
@Override
public int hashCode() {
int result = LLUtils.hashCode(key);
result = 31 * result + LLUtils.hashCode(value);
return result;
}
@Override
public String toString() {
return new StringJoiner(", ", LLEntry.class.getSimpleName() + "[", "]")
.add("key=" + LLUtils.toString(key))
.add("value=" + LLUtils.toString(value))
.toString();
}
@Override
protected RuntimeException createResourceClosedException() {
return new IllegalStateException("Closed");
}
@Override
protected Owned<LLEntry> prepareSend() {
Send<Buffer> keySend;
Send<Buffer> valueSend;
keySend = Objects.requireNonNull(this.key).send();
valueSend = Objects.requireNonNull(this.value).send();
return drop -> {
var instance = new LLEntry(keySend, valueSend);
drop.attach(instance);
return instance;
};
}
}