BaseMessage.java

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/* Copyright 2017 Telstra Open Source
 *
 *   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 org.openkilda.messaging;

import static org.openkilda.messaging.Utils.MAPPER;
import static org.openkilda.messaging.Utils.TIMESTAMP;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import java.io.Serializable;

@JsonSerialize
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonTypeInfo(use=JsonTypeInfo.Id.CLASS, include=JsonTypeInfo.As.PROPERTY, property="clazz")
public abstract class BaseMessage implements Serializable {
    static final long serialVersionUID = 1L;

    @JsonProperty(TIMESTAMP)
    protected long timestamp = 0L;


    @JsonCreator
    public BaseMessage(@JsonProperty(TIMESTAMP) final long timestamp) {
        this.timestamp = timestamp;
    }

    public BaseMessage() {
        this(System.currentTimeMillis());
    }


    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

    public static final <T extends BaseMessage> T getMessage(String json, Class<T> type)
    throws java.io.IOException {
        return type.cast(MAPPER.readValue(json, type));
    }

    public static final <T extends BaseMessage> T tryGetMessage(String json, Class<T> type) {
        try {
            return getMessage(json, type);
        } catch (Exception e) {
            /* Do Nothing */
        }
        return null;

    }

}