io.helidon.webserver.observe.ObserverConfigBase Maven / Gradle / Ivy
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/*
* Copyright (c) 2024 Oracle and/or its affiliates.
*
* 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.helidon.webserver.observe;
import java.util.Objects;
import java.util.Optional;
import io.helidon.builder.api.Prototype;
import io.helidon.common.Errors;
import io.helidon.common.Generated;
import io.helidon.common.config.Config;
/**
* Base configuration for any observer that exposes an endpoint.
*/
@Generated(value = "io.helidon.builder.codegen.BuilderCodegen", trigger = "io.helidon.webserver.observe.ObserverConfigBaseBlueprint")
public interface ObserverConfigBase extends ObserverConfigBaseBlueprint, Prototype.Api {
/**
* Create a new fluent API builder to customize configuration.
*
* @return a new builder
*/
static ObserverConfigBase.Builder builder() {
return new ObserverConfigBase.Builder();
}
/**
* Create a new fluent API builder from an existing instance.
*
* @param instance an existing instance used as a base for the builder
* @return a builder based on an instance
*/
static ObserverConfigBase.Builder builder(ObserverConfigBase instance) {
return ObserverConfigBase.builder().from(instance);
}
/**
* Fluent API builder base for {@link ObserverConfigBase}.
*
* @param type of the builder extending this abstract builder
* @param type of the prototype interface that would be built by {@link #buildPrototype()}
*/
abstract class BuilderBase, PROTOTYPE extends ObserverConfigBase> implements Prototype.ConfiguredBuilder {
private boolean enabled = true;
private Config config;
private String name;
/**
* Protected to support extensibility.
*/
protected BuilderBase() {
}
/**
* Update this builder from an existing prototype instance. This method disables automatic service discovery.
*
* @param prototype existing prototype to update this builder from
* @return updated builder instance
*/
public BUILDER from(ObserverConfigBase prototype) {
enabled(prototype.enabled());
name(prototype.name());
return self();
}
/**
* Update this builder from an existing prototype builder instance.
*
* @param builder existing builder prototype to update this builder from
* @return updated builder instance
*/
public BUILDER from(ObserverConfigBase.BuilderBase builder) {
enabled(builder.enabled());
builder.name().ifPresent(this::name);
return self();
}
/**
* Update builder from configuration (node of this type).
* If a value is present in configuration, it would override currently configured values.
*
* @param config configuration instance used to obtain values to update this builder
* @return updated builder instance
*/
@Override
public BUILDER config(Config config) {
Objects.requireNonNull(config);
this.config = config;
config.get("enabled").as(Boolean.class).ifPresent(this::enabled);
return self();
}
/**
* Whether this observer is enabled.
*
* @param enabled {@code false} to disable observer
* @return updated builder instance
* @see #enabled()
*/
public BUILDER enabled(boolean enabled) {
this.enabled = enabled;
return self();
}
/**
* Name of this observer. Each observer should provide its own default for this property.
*
* @param name observer name
* @return updated builder instance
* @see #name()
*/
public BUILDER name(String name) {
Objects.requireNonNull(name);
this.name = name;
return self();
}
/**
* Whether this observer is enabled.
*
* @return the enabled
*/
public boolean enabled() {
return enabled;
}
/**
* Name of this observer. Each observer should provide its own default for this property.
*
* @return the name
*/
public Optional name() {
return Optional.ofNullable(name);
}
/**
* If this instance was configured, this would be the config instance used.
*
* @return config node used to configure this builder, or empty if not configured
*/
public Optional config() {
return Optional.ofNullable(config);
}
@Override
public String toString() {
return "ObserverConfigBaseBuilder{"
+ "enabled=" + enabled + ","
+ "name=" + name
+ "}";
}
/**
* Handles providers and decorators.
*/
protected void preBuildPrototype() {
}
/**
* Validates required properties.
*/
protected void validatePrototype() {
Errors.Collector collector = Errors.collector();
if (name == null) {
collector.fatal(getClass(), "Property \"name\" is required, but not set");
}
collector.collect().checkValid();
}
/**
* Generated implementation of the prototype, can be extended by descendant prototype implementations.
*/
protected static class ObserverConfigBaseImpl implements ObserverConfigBase {
private final boolean enabled;
private final String name;
/**
* Create an instance providing a builder.
*
* @param builder extending builder base of this prototype
*/
protected ObserverConfigBaseImpl(ObserverConfigBase.BuilderBase builder) {
this.enabled = builder.enabled();
this.name = builder.name().get();
}
@Override
public boolean enabled() {
return enabled;
}
@Override
public String name() {
return name;
}
@Override
public String toString() {
return "ObserverConfigBase{"
+ "enabled=" + enabled + ","
+ "name=" + name
+ "}";
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof ObserverConfigBase other)) {
return false;
}
return enabled == other.enabled()
&& Objects.equals(name, other.name());
}
@Override
public int hashCode() {
return Objects.hash(enabled, name);
}
}
}
/**
* Fluent API builder for {@link ObserverConfigBase}.
*/
class Builder extends ObserverConfigBase.BuilderBase implements io.helidon.common.Builder {
Builder() {
}
@Override
public ObserverConfigBase buildPrototype() {
preBuildPrototype();
validatePrototype();
return new ObserverConfigBaseImpl(this);
}
@Override
public ObserverConfigBase build() {
return buildPrototype();
}
}
}