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ErlangPid.java
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ErlangPid.java
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/*
* Copyright 2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.appulse.encon.terms.type;
import static io.appulse.encon.terms.TermType.PID;
import static java.util.Optional.ofNullable;
import static lombok.AccessLevel.PRIVATE;
import io.appulse.encon.common.NodeDescriptor;
import io.appulse.encon.terms.Erlang;
import io.appulse.encon.terms.ErlangTerm;
import io.appulse.encon.terms.TermType;
import io.appulse.encon.terms.exception.IllegalErlangTermTypeException;
import io.netty.buffer.ByteBuf;
import lombok.Builder;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.NonNull;
import lombok.experimental.FieldDefaults;
import lombok.experimental.NonFinal;
/**
* A process identifier, pid, identifies a process.
*
* @since 1.0.0
* @author Artem Labazin
*/
@Getter
@EqualsAndHashCode(
callSuper = false,
doNotUseGetters = false
)
@FieldDefaults(level = PRIVATE, makeFinal = true)
public class ErlangPid extends ErlangTerm {
private static final long serialVersionUID = 7083159089429831665L;
@NonFinal
NodeDescriptor descriptor;
ErlangAtom node;
int id;
int serial;
int creation;
/**
* Constructs Erlang's term object with specific {@link TermType} from {@link ByteBuf}.
*
* @param type object's type
*
* @param buffer byte buffer
*/
public ErlangPid (TermType type, @NonNull ByteBuf buffer) {
super(type);
node = ErlangTerm.newInstance(buffer);
switch (type) {
case PID:
this.id = buffer.readInt() & 0x7FFF; // 15 bits
this.serial = buffer.readInt() & 0x1FFF; // 13 bits
this.creation = buffer.readUnsignedByte() & 0x03; // 2 bits;
break;
case NEW_PID:
this.id = buffer.readInt();
this.serial = buffer.readInt();
this.creation = buffer.readInt();
break;
default:
throw new IllegalErlangTermTypeException(getClass(), type);
}
}
@Builder
private ErlangPid (TermType type, @NonNull String node, int id, int serial, int creation) {
super(ofNullable(type).orElse(PID));
this.node = Erlang.atom(node);
if (getType() == PID) {
this.id = id & 0x7FFF; // 15 bits
this.serial = serial & 0x1FFF; // 13 bits
this.creation = creation & 0x03; // 2 bits;
} else {
this.id = id;
this.serial = serial;
this.creation = creation;
}
}
@Override
public String asText (String defaultValue) {
return toString();
}
@Override
public ErlangPid asPid () {
return this;
}
@Override
public String toString () {
return new StringBuilder()
.append("#PID<")
.append(creation).append('.')
.append(id).append('.')
.append(serial)
.append('>')
.toString();
}
/**
* Returns container's {@link NodeDescriptor} value.
*
* @return container's {@link NodeDescriptor} value
*/
public final NodeDescriptor getDescriptor () {
if (descriptor == null) {
descriptor = NodeDescriptor.from(node.asText());
}
return descriptor;
}
@Override
protected void serialize (ByteBuf buffer) {
node.writeTo(buffer);
buffer.writeInt(id);
buffer.writeInt(serial);
switch (getType()) {
case PID:
buffer.writeByte(creation);
break;
case NEW_PID:
buffer.writeInt(creation);
break;
default:
throw new IllegalErlangTermTypeException(getClass(), getType());
}
}
}