com.amazonaws.services.kinesis.multilang.messages.Message Maven / Gradle / Ivy

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The Amazon Kinesis Client Library for Java enables Java developers to easily consume and process data from Amazon Kinesis.

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/*
 * Copyright 2019 Amazon.com, Inc. 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 com.amazonaws.services.kinesis.multilang.messages;

import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.JsonSubTypes.Type;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Abstract class for all messages that are sent to the client's process.
 */
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "action")
@JsonSubTypes({ 
        @Type(value = CheckpointMessage.class, name = CheckpointMessage.ACTION),
        @Type(value = InitializeMessage.class, name = InitializeMessage.ACTION),
        @Type(value = ProcessRecordsMessage.class, name = ProcessRecordsMessage.ACTION),
        @Type(value = ShutdownMessage.class, name = ShutdownMessage.ACTION),
        @Type(value = StatusMessage.class, name = StatusMessage.ACTION),
        @Type(value = ShutdownRequestedMessage.class, name = ShutdownRequestedMessage.ACTION),
})
public abstract class Message {

    private ObjectMapper mapper = new ObjectMapper();;

    /**
     * Default constructor.
     */
    public Message() {
    }

    /**
     * 
     * @param objectMapper An object mapper.
     * @return this
     */
    Message withObjectMapper(ObjectMapper objectMapper) {
        this.mapper = objectMapper;
        return this;
    }

    /**
     * 
     * @return A JSON representation of this object.
     */
    public String toString() {
        try {
            return mapper.writeValueAsString(this);
        } catch (Exception e) {
            return super.toString();
        }
    }
}