com.google.gerrit.server.util.RequestId.java Source code

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Here is the source code for com.google.gerrit.server.util.RequestId.java

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// Copyright (C) 2016 The Android Open Source Project
//
// 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.google.gerrit.server.util;

import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;
import com.google.gerrit.common.TimeUtil;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.Project;
import java.net.InetAddress;
import java.net.UnknownHostException;

/** Unique identifier for an end-user request, used in logs and similar. */
public class RequestId {
    private static final String MACHINE_ID;

    static {
        String id;
        try {
            id = InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            id = "unknown";
        }
        MACHINE_ID = id;
    }

    public static RequestId forChange(Change c) {
        return new RequestId(c.getId().toString());
    }

    public static RequestId forProject(Project.NameKey p) {
        return new RequestId(p.toString());
    }

    private final String str;

    private RequestId(String resourceId) {
        Hasher h = Hashing.sha1().newHasher();
        h.putLong(Thread.currentThread().getId()).putUnencodedChars(MACHINE_ID);
        str = "[" + resourceId + "-" + TimeUtil.nowTs().getTime() + "-" + h.hash().toString().substring(0, 8) + "]";
    }

    @Override
    public String toString() {
        return str;
    }

    public String toStringForStorage() {
        return str.substring(1, str.length() - 1);
    }
}