org.apache.twill.internal.json.LogEntryDecoder.java Source code

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Here is the source code for org.apache.twill.internal.json.LogEntryDecoder.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.twill.internal.json;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import org.apache.twill.api.logging.LogEntry;
import org.apache.twill.api.logging.LogThrowable;

import java.lang.reflect.Type;

/**
 * A Gson decoder for {@link LogEntry}.
 */
public final class LogEntryDecoder implements JsonDeserializer<LogEntry> {

    private static final StackTraceElement[] EMPTY_STACK_TRACES = new StackTraceElement[0];

    @Override
    public LogEntry deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        if (!json.isJsonObject()) {
            return null;
        }
        JsonObject jsonObj = json.getAsJsonObject();

        final String name = JsonUtils.getAsString(jsonObj, "name");
        final String host = JsonUtils.getAsString(jsonObj, "host");
        final long timestamp = JsonUtils.getAsLong(jsonObj, "timestamp", 0);
        final LogEntry.Level logLevel = LogEntry.Level.valueOf(JsonUtils.getAsString(jsonObj, "level"));
        final String className = JsonUtils.getAsString(jsonObj, "className");
        final String method = JsonUtils.getAsString(jsonObj, "method");
        final String file = JsonUtils.getAsString(jsonObj, "file");
        final String line = JsonUtils.getAsString(jsonObj, "line");
        final String thread = JsonUtils.getAsString(jsonObj, "thread");
        final String message = JsonUtils.getAsString(jsonObj, "message");
        final String runnableName = JsonUtils.getAsString(jsonObj, "runnableName");
        final LogThrowable logThrowable = context.deserialize(jsonObj.get("throwable"), LogThrowable.class);

        return new LogEntry() {
            @Override
            public String getLoggerName() {
                return name;
            }

            @Override
            public String getHost() {
                return host;
            }

            @Override
            public long getTimestamp() {
                return timestamp;
            }

            @Override
            public Level getLogLevel() {
                return logLevel;
            }

            @Override
            public String getSourceClassName() {
                return className;
            }

            @Override
            public String getSourceMethodName() {
                return method;
            }

            @Override
            public String getFileName() {
                return file;
            }

            @Override
            public int getLineNumber() {
                if (line.equals("?")) {
                    return -1;
                } else {
                    return Integer.parseInt(line);
                }
            }

            @Override
            public String getThreadName() {
                return thread;
            }

            @Override
            public String getMessage() {
                return message;
            }

            @Override
            public String getRunnableName() {
                return runnableName;
            }

            @Override
            public LogThrowable getThrowable() {
                return logThrowable;
            }

            @Override
            public StackTraceElement[] getStackTraces() {
                LogThrowable throwable = getThrowable();
                return (throwable == null) ? EMPTY_STACK_TRACES : throwable.getStackTraces();
            }
        };
    }
}