org.cloudata.core.commitlog.pipe.PipeState.java Source code

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Here is the source code for org.cloudata.core.commitlog.pipe.PipeState.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.cloudata.core.commitlog.pipe;

import java.io.IOException;
import java.nio.channels.SelectionKey;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.cloudata.core.commitlog.pipe.Pipe.Context;
import org.cloudata.core.common.CStopWatch;

abstract class PipeState {
    Log LOG = LogFactory.getLog(PipeState.class);
    static final int ACK_SIZE = 1 + (Long.SIZE / 8);

    protected boolean writeAckToPrev(Pipe.Context ctx) throws IOException {
        ctx.prevChannel.write(ctx.ack);

        if (ctx.ack.hasRemaining()) {
            if (!ctx.selectingWritePrev) {
                ctx.registerToSelect(ctx.prevChannel, SelectionKey.OP_WRITE);
                ctx.selectingWritePrev = true;
            }

            LOG.info("ack will be sent in next select time!!");
            return false;
        } else {
            ctx.ack.clear();

            if (ctx.selectingWritePrev) {
                ctx.deregisterFromSelect(ctx.prevChannel, SelectionKey.OP_WRITE);
            }

            return true;
        }
    }

    abstract void init(Pipe.Context ctx) throws IOException;

    abstract String getStateName();

    boolean writeToNext(Pipe.Context ctx) throws IOException {
        LOG.warn("Illegal invocation of writeToNext");
        return true;
    }

    boolean writeToPrev(Pipe.Context ctx) throws IOException {
        LOG.warn("Illegal invocation of writeToPrev");
        return true;
    }

    boolean readFromNext(Pipe.Context ctx) throws IOException {
        LOG.warn("State : " + getStateName() + ", Illegal invocation of readFromNext");
        return true;
    }

    boolean readFromPrev(Pipe.Context ctx) throws IOException {
        LOG.warn("Illegal invocation of readFromPrev");
        return true;
    }

    boolean connectToNext(Pipe.Context ctx) throws IOException {
        LOG.warn("Illegal invocation of connectToNext");
        return true;
    }

    boolean accept(Pipe.Context ctx) {
        LOG.warn("Illegal invocation of accept");
        return true;
    }

    void shutdown(Pipe.Context ctx) {
        LOG.warn("Illegal invocation of shutdown");
    }

    abstract public void close(Pipe.Context ctx) throws IOException;

    public boolean writeFileDone(Context ctx) throws IOException {
        LOG.warn("Illegal invocation of writeFileDone");
        return true;
    }
}