com.facebook.buck.message_ipc.MessageSerializer.java Source code

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Here is the source code for com.facebook.buck.message_ipc.MessageSerializer.java

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/*
 * Copyright 2016-present Facebook, Inc.
 *
 * 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 com.facebook.buck.message_ipc;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

import java.io.IOException;
import java.util.List;
import java.util.Map;

public class MessageSerializer {
    private static final String TYPE = "type";
    private static final String NAME = "name";
    private static final String ARGS = "args";
    private static final String VALUE = "value";
    private final ObjectMapper objectMapper;

    public MessageSerializer(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
    }

    public String serializeInvocation(InvocationMessage invocation) throws JsonProcessingException {
        ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
        builder.put(TYPE, InvocationMessage.class.getSimpleName());
        builder.put(NAME, invocation.getMethodName());
        builder.put(ARGS, invocation.getArguments());
        return objectMapper.writeValueAsString(builder.build());
    }

    @SuppressWarnings("unchecked")
    public InvocationMessage deserializeInvocation(String data) throws IOException {
        Map<String, Object> rep = objectMapper.readValue(data, new TypeReference<Map<String, Object>>() {
        });
        String type = (String) rep.get(TYPE);
        Preconditions.checkNotNull(type, "Unable to deserialize %s: no field %s in data (%s)",
                InvocationMessage.class.getSimpleName(), TYPE, data);
        Preconditions.checkArgument(type.equals(InvocationMessage.class.getSimpleName()));
        return new InvocationMessage((String) rep.get(NAME), (List<Object>) rep.get(ARGS));
    }

    public String serializeResult(ReturnResultMessage message) throws JsonProcessingException {
        ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
        builder.put(TYPE, ReturnResultMessage.class.getSimpleName());
        builder.put(VALUE, message.getValue());
        return objectMapper.writeValueAsString(builder.build());
    }

    public ReturnResultMessage deserializeResult(String data) throws IOException {
        Map<String, Object> rep = objectMapper.readValue(data, new TypeReference<Map<String, Object>>() {
        });
        String type = (String) rep.get(TYPE);
        Preconditions.checkNotNull(type, "Unable to deserialize %s: no field %s in data (%s)",
                ReturnResultMessage.class.getSimpleName(), TYPE, data);
        Preconditions.checkArgument(type.equals(ReturnResultMessage.class.getSimpleName()));
        return new ReturnResultMessage(rep.get(VALUE));
    }
}