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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.

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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.logging.log4j.message;

import org.apache.logging.log4j.util.Chars;
import org.apache.logging.log4j.util.StringBuilders;

/**
 * Generates information about the current Thread. Used internally by ThreadDumpMessage.
 */
class BasicThreadInformation implements ThreadInformation {
    private static final int HASH_SHIFT = 32;
    private static final int HASH_MULTIPLIER = 31;
    private final long id;
    private final String name;
    private final String longName;
    private final Thread.State state;
    private final int priority;
    private final boolean isAlive;
    private final boolean isDaemon;
    private final String threadGroupName;

    /**
     * The Constructor.
     * @param thread The Thread to capture.
     */
    public BasicThreadInformation(final Thread thread) {
        this.id = thread.getId();
        this.name = thread.getName();
        this.longName = thread.toString();
        this.state = thread.getState();
        this.priority = thread.getPriority();
        this.isAlive = thread.isAlive();
        this.isDaemon = thread.isDaemon();
        final ThreadGroup group = thread.getThreadGroup();
        threadGroupName = group == null ? null : group.getName();
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        final BasicThreadInformation that = (BasicThreadInformation) o;

        if (id != that.id) {
            return false;
        }
        if (name != null ? !name.equals(that.name) : that.name != null) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int result = (int) (id ^ (id >>> HASH_SHIFT));
        result = HASH_MULTIPLIER * result + (name != null ? name.hashCode() : 0);
        return result;
    }

    /**
     * Print the thread information.
     * @param sb The StringBuilder.
     */
    @Override
    public void printThreadInfo(final StringBuilder sb) {
        StringBuilders.appendDqValue(sb, name).append(Chars.SPACE);
        if (isDaemon) {
            sb.append("daemon ");
        }
        sb.append("prio=").append(priority).append(" tid=").append(id).append(' ');
        if (threadGroupName != null) {
            StringBuilders.appendKeyDqValue(sb, "group", threadGroupName);
        }
        sb.append('\n');
        sb.append("\tThread state: ").append(state.name()).append('\n');
    }

    /**
     * Format the StackTraceElements.
     * @param sb The StringBuilder.
     * @param trace The stack trace element array to format.
     */
    @Override
    public void printStack(final StringBuilder sb, final StackTraceElement[] trace) {
        for (final StackTraceElement element : trace) {
            sb.append("\tat ").append(element).append('\n');
        }
    }
}