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Enables serialization/deserialization in Micronaut applications using build time information
There is a newer version: 2.12.0
/*
 * Copyright 2017-2022 original 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
 *
 * https://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.micronaut.serde;

import io.micronaut.context.ApplicationContext;
import io.micronaut.context.ApplicationContextConfiguration;
import io.micronaut.context.DefaultApplicationContext;
import io.micronaut.context.env.DefaultEnvironment;
import io.micronaut.context.env.Environment;
import io.micronaut.context.env.PropertySource;
import io.micronaut.core.annotation.Nullable;
import io.micronaut.core.type.Argument;
import io.micronaut.core.util.CollectionUtils;
import io.micronaut.inject.BeanDefinitionReference;
import io.micronaut.json.JsonStreamConfig;
import io.micronaut.json.tree.JsonNode;
import org.reactivestreams.Processor;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Future;
import java.util.function.Consumer;

/**
 *
 * @author graemerocher
 * @since 1.2.2
 */
@SuppressWarnings("java:S3077")
final class ObjectMappers {
    private static volatile ObjectMapper defaultObjectMapper;
    private static volatile ApplicationContext beanContext;
    private static final Object MAPPER_LOCK = new Object();
    private static final Object CONTEXT_LOCK = new Object();

    private ObjectMappers() {
    }

    /**
     * Resolves the default.
     * @return The object mapper
     */
    @SuppressWarnings("java:S2095")
    static ObjectMapper resolveDefault() {
        ObjectMapper objectMapper = defaultObjectMapper;
        if (objectMapper == null) {
            synchronized (MAPPER_LOCK) {
                objectMapper = defaultObjectMapper;
                if (objectMapper == null) {
                    objectMapper = resolveBeanContext().getBean(ObjectMapper.class);
                    defaultObjectMapper = objectMapper;
                }
            }
        }
        return objectMapper;
    }

    @SuppressWarnings("java:S2095")
    private static ApplicationContext resolveBeanContext() {
        ApplicationContext context = beanContext;
        if (context == null) {
            synchronized (CONTEXT_LOCK) {
                context = beanContext;
                if (context == null) {
                    context = new ObjectMapperContext(null).start();
                    beanContext = context;
                }
            }
        }
        return context;
    }

    @SuppressWarnings("java:S2095")
    static ObjectMapper.CloseableObjectMapper create(Map configuration, String... packageNames) {
        ObjectMapperContext context = new ObjectMapperContext(configuration) {
            @Override
            protected Set getIncludedPackages() {
                Set includedPackages = super.getIncludedPackages();
                includedPackages.addAll(CollectionUtils.setOf(packageNames));
                return includedPackages;
            }
        };
        context.start();
        ObjectMapper objectMapper = context.getBean(ObjectMapper.class);
        return new ObjectMapper.CloseableObjectMapper() {

            @Override
            public  T readValueFromTree(JsonNode tree, Argument type) throws IOException {
                return objectMapper.readValueFromTree(tree, type);
            }

            @Override
            public  T readValue(InputStream inputStream, Argument type) throws IOException {
                return objectMapper.readValue(inputStream, type);
            }

            @Override
            public  T readValue(byte[] byteArray, Argument type) throws IOException {
                return objectMapper.readValue(byteArray, type);
            }

            @Override
            public Processor createReactiveParser(Consumer> onSubscribe, boolean streamArray) {
                return objectMapper.createReactiveParser(onSubscribe, streamArray);
            }

            @Override
            public JsonNode writeValueToTree(Object value) throws IOException {
                return objectMapper.writeValueToTree(value);
            }

            @Override
            public  JsonNode writeValueToTree(Argument type, T value) throws IOException {
                return writeValueToTree(type, value);
            }

            @Override
            public void writeValue(OutputStream outputStream, Object object) throws IOException {
                objectMapper.writeValue(outputStream, object);
            }

            @Override
            public  void writeValue(OutputStream outputStream, Argument type, T object) throws IOException {
                objectMapper.writeValue(outputStream, type, object);
            }

            @Override
            public byte[] writeValueAsBytes(Object object) throws IOException {
                return objectMapper.writeValueAsBytes(object);
            }

            @Override
            public  byte[] writeValueAsBytes(Argument type, T object) throws IOException {
                return objectMapper.writeValueAsBytes(type, object);
            }

            @Override
            public JsonStreamConfig getStreamConfig() {
                return objectMapper.getStreamConfig();
            }

            @Override
            public void close() {
                context.close();
            }
        };

    }

    private static class ObjectMapperContext extends DefaultApplicationContext {
        private final Map config;

        private ObjectMapperContext(@Nullable Map config) {
            this.config = config;
        }

        /**
         * @return The included packages.
         */
        protected Set getIncludedPackages() {
            return CollectionUtils.setOf(
                "io.micronaut.serde",
                "io.micronaut.aop",
                "io.micronaut.runtime.context.env"
            );
        }

        @Override
        protected List resolveBeanDefinitionReferences() {
            return super.resolveBeanDefinitionReferences()
                .stream()
                .filter(ref ->
                    getIncludedPackages().stream().anyMatch(n -> ref.getBeanDefinitionName().startsWith(n))
                )
                .toList();
        }

        @Override
        @SuppressWarnings("java:S1874")
        public Future publishEventAsync(Object event) {
            return CompletableFuture.completedFuture(null);
        }

        @Override
        public void publishEvent(Object event) {
            // no-op
        }

        @Override
        protected Environment createEnvironment(ApplicationContextConfiguration configuration) {
            return new DefaultEnvironment((ApplicationContextConfiguration) getContextConfiguration()) {
                @Override
                protected void readPropertySources(String name) {
                    // no-op
                    if (config != null) {
                        processPropertySource(PropertySource.of(config), PropertySource.PropertyConvention.JAVA_PROPERTIES);
                    }
                }
            };
        }
    }
}