Quelle AbstractStream.java Sprache: JAVA

/*
*  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.coyote.http2;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;

/**
* Base class for all streams including the connection (referred to as Stream 0) and is used primarily when managing
* prioritization.
*/
abstract class AbstractStream {

    private static final Log log = LogFactory.getLog(AbstractStream.class);
    private static final StringManager sm = StringManager.getManager(AbstractStream.class);

    private final Integer identifier;
    private final String idAsString;

    private long windowSize = ConnectionSettingsBase.DEFAULT_INITIAL_WINDOW_SIZE;
    protected final Lock windowAllocationLock = new ReentrantLock();
    protected final Condition windowAllocationAvailable = windowAllocationLock.newCondition();

    private volatile int connectionAllocationRequested = 0;
    private volatile int connectionAllocationMade = 0;

    AbstractStream(Integer identifier) {
        this.identifier = identifier;
        this.idAsString = identifier.toString();
    }

    final Integer getIdentifier() {
        return identifier;
    }

    final String getIdAsString() {
        return idAsString;
    }

    final int getIdAsInt() {
        return identifier.intValue();
    }

    final void setWindowSize(long windowSize) {
        windowAllocationLock.lock();
        try {
            this.windowSize = windowSize;
        } finally {
            windowAllocationLock.unlock();
        }
    }

    final long getWindowSize() {
        windowAllocationLock.lock();
        try {
            return windowSize;
        } finally {
            windowAllocationLock.unlock();
        }
    }

    /**
     * Increment window size.
     *
     * @param increment The amount by which the window size should be increased
     *
     * @throws Http2Exception If the window size is now higher than the maximum allowed
     */
    void incrementWindowSize(int increment) throws Http2Exception {
        windowAllocationLock.lock();
        try {
            // No need for overflow protection here.
            // Increment can't be more than Integer.MAX_VALUE and once windowSize
            // goes beyond 2^31-1 an error is triggered.
            windowSize += increment;

            if (log.isDebugEnabled()) {
                log.debug(sm.getString("abstractStream.windowSizeInc", getConnectionId(), getIdAsString(),
                        Integer.toString(increment), Long.toString(windowSize)));
            }

            if (windowSize > ConnectionSettingsBase.MAX_WINDOW_SIZE) {
                String msg = sm.getString("abstractStream.windowSizeTooBig", getConnectionId(), identifier,
                        Integer.toString(increment), Long.toString(windowSize));
                if (identifier.intValue() == 0) {
                    throw new ConnectionException(msg, Http2Error.FLOW_CONTROL_ERROR);
                } else {
                    throw new StreamException(msg, Http2Error.FLOW_CONTROL_ERROR, identifier.intValue());
                }
            }
        } finally {
            windowAllocationLock.unlock();
        }
    }

    final void decrementWindowSize(int decrement) {
        windowAllocationLock.lock();
        try {
            // No need for overflow protection here. Decrement can never be larger
            // the Integer.MAX_VALUE and once windowSize goes negative no further
            // decrements are permitted
            windowSize -= decrement;
            if (log.isDebugEnabled()) {
                log.debug(sm.getString("abstractStream.windowSizeDec", getConnectionId(), getIdAsString(),
                        Integer.toString(decrement), Long.toString(windowSize)));
            }
        } finally {
            windowAllocationLock.unlock();
        }
    }

    final int getConnectionAllocationRequested() {
        return connectionAllocationRequested;
    }

    final void setConnectionAllocationRequested(int connectionAllocationRequested) {
        log.debug(sm.getString("abstractStream.setConnectionAllocationRequested", getConnectionId(), getIdAsString(),
                Integer.toString(this.connectionAllocationRequested), Integer.toString(connectionAllocationRequested)));
        this.connectionAllocationRequested = connectionAllocationRequested;
    }

    final int getConnectionAllocationMade() {
        return connectionAllocationMade;
    }

    final void setConnectionAllocationMade(int connectionAllocationMade) {
        log.debug(sm.getString("abstractStream.setConnectionAllocationMade", getConnectionId(), getIdAsString(),
                Integer.toString(this.connectionAllocationMade), Integer.toString(connectionAllocationMade)));
        this.connectionAllocationMade = connectionAllocationMade;
    }

    abstract String getConnectionId();
}

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