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ActiveMQ example source code file (BaseDataStreamMarshaller.java)

This example ActiveMQ source code file (BaseDataStreamMarshaller.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

booleanstream, booleanstream, bytesequence, datainput, dataoutput, dataoutput, datastructure, datastructure, io, ioexception, ioexception, object, reflection, stacktraceelement, string, throwable

The ActiveMQ BaseDataStreamMarshaller.java source code

/**
 * 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.activemq.openwire.v6;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.lang.reflect.Constructor;

import org.apache.activemq.command.DataStructure;
import org.apache.activemq.openwire.BooleanStream;
import org.apache.activemq.openwire.DataStreamMarshaller;
import org.apache.activemq.openwire.OpenWireFormat;
import org.apache.activemq.util.ByteSequence;

public abstract class BaseDataStreamMarshaller implements DataStreamMarshaller {

    public static final Constructor STACK_TRACE_ELEMENT_CONSTRUCTOR;

    static {
        Constructor constructor = null;
        try {
            constructor = StackTraceElement.class.getConstructor(new Class[] {String.class, String.class,
                                                                              String.class, int.class});
        } catch (Throwable e) {
        }
        STACK_TRACE_ELEMENT_CONSTRUCTOR = constructor;
    }

    public abstract byte getDataStructureType();

    public abstract DataStructure createObject();

    public int tightMarshal1(OpenWireFormat wireFormat, Object o, BooleanStream bs) throws IOException {
        return 0;
    }

    public void tightMarshal2(OpenWireFormat wireFormat, Object o, DataOutput dataOut, BooleanStream bs)
        throws IOException {
    }

    public void tightUnmarshal(OpenWireFormat wireFormat, Object o, DataInput dataIn, BooleanStream bs)
        throws IOException {
    }

    public int tightMarshalLong1(OpenWireFormat wireFormat, long o, BooleanStream bs) throws IOException {
        if (o == 0) {
            bs.writeBoolean(false);
            bs.writeBoolean(false);
            return 0;
        } else if ((o & 0xFFFFFFFFFFFF0000L) == 0) {
            bs.writeBoolean(false);
            bs.writeBoolean(true);
            return 2;
        } else if ((o & 0xFFFFFFFF00000000L) == 0) {
            bs.writeBoolean(true);
            bs.writeBoolean(false);
            return 4;
        } else {
            bs.writeBoolean(true);
            bs.writeBoolean(true);
            return 8;
        }
    }

    public void tightMarshalLong2(OpenWireFormat wireFormat, long o, DataOutput dataOut, BooleanStream bs)
        throws IOException {
        if (bs.readBoolean()) {
            if (bs.readBoolean()) {
                dataOut.writeLong(o);
            } else {
                dataOut.writeInt((int)o);
            }
        } else {
            if (bs.readBoolean()) {
                dataOut.writeShort((int)o);
            }
        }
    }

    public long tightUnmarshalLong(OpenWireFormat wireFormat, DataInput dataIn, BooleanStream bs)
        throws IOException {
        if (bs.readBoolean()) {
            if (bs.readBoolean()) {
                return dataIn.readLong();
            } else {
                return toLong(dataIn.readInt());
            }
        } else {
            if (bs.readBoolean()) {
                return toLong(dataIn.readShort());
            } else {
                return 0;
            }
        }
    }

    protected long toLong(short value) {
        // lets handle negative values
        long answer = value;
        return answer & 0xffffL;
    }

    protected long toLong(int value) {
        // lets handle negative values
        long answer = value;
        return answer & 0xffffffffL;
    }

    protected DataStructure tightUnmarsalNestedObject(OpenWireFormat wireFormat, DataInput dataIn,
                                                      BooleanStream bs) throws IOException {
        return wireFormat.tightUnmarshalNestedObject(dataIn, bs);
    }

    protected int tightMarshalNestedObject1(OpenWireFormat wireFormat, DataStructure o, BooleanStream bs)
        throws IOException {
        return wireFormat.tightMarshalNestedObject1(o, bs);
    }

    protected void tightMarshalNestedObject2(OpenWireFormat wireFormat, DataStructure o, DataOutput dataOut,
                                             BooleanStream bs) throws IOException {
        wireFormat.tightMarshalNestedObject2(o, dataOut, bs);
    }

    protected DataStructure tightUnmarsalCachedObject(OpenWireFormat wireFormat, DataInput dataIn,
                                                      BooleanStream bs) throws IOException {
        if (wireFormat.isCacheEnabled()) {
            if (bs.readBoolean()) {
                short index = dataIn.readShort();
                DataStructure object = wireFormat.tightUnmarshalNestedObject(dataIn, bs);
                wireFormat.setInUnmarshallCache(index, object);
                return object;
            } else {
                short index = dataIn.readShort();
                return wireFormat.getFromUnmarshallCache(index);
            }
        } else {
            return wireFormat.tightUnmarshalNestedObject(dataIn, bs);
        }
    }

    protected int tightMarshalCachedObject1(OpenWireFormat wireFormat, DataStructure o, BooleanStream bs)
        throws IOException {
        if (wireFormat.isCacheEnabled()) {
            Short index = wireFormat.getMarshallCacheIndex(o);
            bs.writeBoolean(index == null);
            if (index == null) {
                int rc = wireFormat.tightMarshalNestedObject1(o, bs);
                wireFormat.addToMarshallCache(o);
                return 2 + rc;
            } else {
                return 2;
            }
        } else {
            return wireFormat.tightMarshalNestedObject1(o, bs);
        }
    }

    protected void tightMarshalCachedObject2(OpenWireFormat wireFormat, DataStructure o, DataOutput dataOut,
                                             BooleanStream bs) throws IOException {
        if (wireFormat.isCacheEnabled()) {
            Short index = wireFormat.getMarshallCacheIndex(o);
            if (bs.readBoolean()) {
                dataOut.writeShort(index.shortValue());
                wireFormat.tightMarshalNestedObject2(o, dataOut, bs);
            } else {
                dataOut.writeShort(index.shortValue());
            }
        } else {
            wireFormat.tightMarshalNestedObject2(o, dataOut, bs);
        }
    }

    protected Throwable tightUnmarsalThrowable(OpenWireFormat wireFormat, DataInput dataIn, BooleanStream bs)
        throws IOException {
        if (bs.readBoolean()) {
            String clazz = tightUnmarshalString(dataIn, bs);
            String message = tightUnmarshalString(dataIn, bs);
            Throwable o = createThrowable(clazz, message);
            if (wireFormat.isStackTraceEnabled()) {
                if (STACK_TRACE_ELEMENT_CONSTRUCTOR != null) {
                    StackTraceElement ss[] = new StackTraceElement[dataIn.readShort()];
                    for (int i = 0; i < ss.length; i++) {
                        try {
                            ss[i] = (StackTraceElement)STACK_TRACE_ELEMENT_CONSTRUCTOR
                                .newInstance(new Object[] {tightUnmarshalString(dataIn, bs),
                                                           tightUnmarshalString(dataIn, bs),
                                                           tightUnmarshalString(dataIn, bs),
                                                           Integer.valueOf(dataIn.readInt())});
                        } catch (IOException e) {
                            throw e;
                        } catch (Throwable e) {
                        }
                    }
                    o.setStackTrace(ss);
                } else {
                    short size = dataIn.readShort();
                    for (int i = 0; i < size; i++) {
                        tightUnmarshalString(dataIn, bs);
                        tightUnmarshalString(dataIn, bs);
                        tightUnmarshalString(dataIn, bs);
                        dataIn.readInt();
                    }
                }
                o.initCause(tightUnmarsalThrowable(wireFormat, dataIn, bs));

            }
            return o;
        } else {
            return null;
        }
    }

    private Throwable createThrowable(String className, String message) {
        try {
            Class clazz = Class.forName(className, false, BaseDataStreamMarshaller.class.getClassLoader());
            Constructor constructor = clazz.getConstructor(new Class[] {String.class});
            return (Throwable)constructor.newInstance(new Object[] {message});
        } catch (Throwable e) {
            return new Throwable(className + ": " + message);
        }
    }

    protected int tightMarshalThrowable1(OpenWireFormat wireFormat, Throwable o, BooleanStream bs)
        throws IOException {
        if (o == null) {
            bs.writeBoolean(false);
            return 0;
        } else {
            int rc = 0;
            bs.writeBoolean(true);
            rc += tightMarshalString1(o.getClass().getName(), bs);
            rc += tightMarshalString1(o.getMessage(), bs);
            if (wireFormat.isStackTraceEnabled()) {
                rc += 2;
                StackTraceElement[] stackTrace = o.getStackTrace();
                for (int i = 0; i < stackTrace.length; i++) {
                    StackTraceElement element = stackTrace[i];
                    rc += tightMarshalString1(element.getClassName(), bs);
                    rc += tightMarshalString1(element.getMethodName(), bs);
                    rc += tightMarshalString1(element.getFileName(), bs);
                    rc += 4;
                }
                rc += tightMarshalThrowable1(wireFormat, o.getCause(), bs);
            }
            return rc;
        }
    }

    protected void tightMarshalThrowable2(OpenWireFormat wireFormat, Throwable o, DataOutput dataOut,
                                          BooleanStream bs) throws IOException {
        if (bs.readBoolean()) {
            tightMarshalString2(o.getClass().getName(), dataOut, bs);
            tightMarshalString2(o.getMessage(), dataOut, bs);
            if (wireFormat.isStackTraceEnabled()) {
                StackTraceElement[] stackTrace = o.getStackTrace();
                dataOut.writeShort(stackTrace.length);
                for (int i = 0; i < stackTrace.length; i++) {
                    StackTraceElement element = stackTrace[i];
                    tightMarshalString2(element.getClassName(), dataOut, bs);
                    tightMarshalString2(element.getMethodName(), dataOut, bs);
                    tightMarshalString2(element.getFileName(), dataOut, bs);
                    dataOut.writeInt(element.getLineNumber());
                }
                tightMarshalThrowable2(wireFormat, o.getCause(), dataOut, bs);
            }
        }
    }

    @SuppressWarnings("deprecation")
    protected String tightUnmarshalString(DataInput dataIn, BooleanStream bs) throws IOException {
        if (bs.readBoolean()) {
            if (bs.readBoolean()) {
                int size = dataIn.readShort();
                byte data[] = new byte[size];
                dataIn.readFully(data);
                // Yes deprecated, but we know what we are doing.
                // This allows us to create a String from a ASCII byte array. (no UTF-8 decoding)
                return new String(data, 0);
            } else {
                return dataIn.readUTF();
            }
        } else {
            return null;
        }
    }

    protected int tightMarshalString1(String value, BooleanStream bs) throws IOException {
        bs.writeBoolean(value != null);
        if (value != null) {

            int strlen = value.length();
            int utflen = 0;
            char[] charr = new char[strlen];
            int c = 0;
            boolean isOnlyAscii = true;

            value.getChars(0, strlen, charr, 0);

            for (int i = 0; i < strlen; i++) {
                c = charr[i];
                if ((c >= 0x0001) && (c <= 0x007F)) {
                    utflen++;
                } else if (c > 0x07FF) {
                    utflen += 3;
                    isOnlyAscii = false;
                } else {
                    isOnlyAscii = false;
                    utflen += 2;
                }
            }

            if (utflen >= Short.MAX_VALUE) {
                throw new IOException("Encountered a String value that is too long to encode.");
            }
            bs.writeBoolean(isOnlyAscii);
            return utflen + 2;

        } else {
            return 0;
        }
    }

    protected void tightMarshalString2(String value, DataOutput dataOut, BooleanStream bs) throws IOException {
        if (bs.readBoolean()) {
            // If we verified it only holds ascii values
            if (bs.readBoolean()) {
                dataOut.writeShort(value.length());
                dataOut.writeBytes(value);
            } else {
                dataOut.writeUTF(value);
            }
        }
    }

    protected int tightMarshalObjectArray1(OpenWireFormat wireFormat, DataStructure[] objects,
                                           BooleanStream bs) throws IOException {
        if (objects != null) {
            int rc = 0;
            bs.writeBoolean(true);
            rc += 2;
            for (int i = 0; i < objects.length; i++) {
                rc += tightMarshalNestedObject1(wireFormat, objects[i], bs);
            }
            return rc;
        } else {
            bs.writeBoolean(false);
            return 0;
        }
    }

    protected void tightMarshalObjectArray2(OpenWireFormat wireFormat, DataStructure[] objects,
                                            DataOutput dataOut, BooleanStream bs) throws IOException {
        if (bs.readBoolean()) {
            dataOut.writeShort(objects.length);
            for (int i = 0; i < objects.length; i++) {
                tightMarshalNestedObject2(wireFormat, objects[i], dataOut, bs);
            }
        }
    }

    protected int tightMarshalConstByteArray1(byte[] data, BooleanStream bs, int i) throws IOException {
        return i;
    }

    protected void tightMarshalConstByteArray2(byte[] data, DataOutput dataOut, BooleanStream bs, int i)
        throws IOException {
        dataOut.write(data, 0, i);
    }

    protected byte[] tightUnmarshalConstByteArray(DataInput dataIn, BooleanStream bs, int i)
        throws IOException {
        byte data[] = new byte[i];
        dataIn.readFully(data);
        return data;
    }

    protected int tightMarshalByteArray1(byte[] data, BooleanStream bs) throws IOException {
        bs.writeBoolean(data != null);
        if (data != null) {
            return data.length + 4;
        } else {
            return 0;
        }
    }

    protected void tightMarshalByteArray2(byte[] data, DataOutput dataOut, BooleanStream bs)
        throws IOException {
        if (bs.readBoolean()) {
            dataOut.writeInt(data.length);
            dataOut.write(data);
        }
    }

    protected byte[] tightUnmarshalByteArray(DataInput dataIn, BooleanStream bs) throws IOException {
        byte rc[] = null;
        if (bs.readBoolean()) {
            int size = dataIn.readInt();
            rc = new byte[size];
            dataIn.readFully(rc);
        }
        return rc;
    }

    protected int tightMarshalByteSequence1(ByteSequence data, BooleanStream bs) throws IOException {
        bs.writeBoolean(data != null);
        if (data != null) {
            return data.getLength() + 4;
        } else {
            return 0;
        }
    }

    protected void tightMarshalByteSequence2(ByteSequence data, DataOutput dataOut, BooleanStream bs)
        throws IOException {
        if (bs.readBoolean()) {
            dataOut.writeInt(data.getLength());
            dataOut.write(data.getData(), data.getOffset(), data.getLength());
        }
    }

    protected ByteSequence tightUnmarshalByteSequence(DataInput dataIn, BooleanStream bs) throws IOException {
        ByteSequence rc = null;
        if (bs.readBoolean()) {
            int size = dataIn.readInt();
            byte[] t = new byte[size];
            dataIn.readFully(t);
            return new ByteSequence(t, 0, size);
        }
        return rc;
    }

    //
    // The loose marshaling logic
    //

    public void looseMarshal(OpenWireFormat wireFormat, Object o, DataOutput dataOut) throws IOException {
    }

    public void looseUnmarshal(OpenWireFormat wireFormat, Object o, DataInput dataIn) throws IOException {
    }

    public void looseMarshalLong(OpenWireFormat wireFormat, long o, DataOutput dataOut) throws IOException {
        dataOut.writeLong(o);
    }

    public long looseUnmarshalLong(OpenWireFormat wireFormat, DataInput dataIn) throws IOException {
        return dataIn.readLong();
    }

    protected DataStructure looseUnmarsalNestedObject(OpenWireFormat wireFormat, DataInput dataIn)
        throws IOException {
        return wireFormat.looseUnmarshalNestedObject(dataIn);
    }

    protected void looseMarshalNestedObject(OpenWireFormat wireFormat, DataStructure o, DataOutput dataOut)
        throws IOException {
        wireFormat.looseMarshalNestedObject(o, dataOut);
    }

    protected DataStructure looseUnmarsalCachedObject(OpenWireFormat wireFormat, DataInput dataIn)
        throws IOException {
        if (wireFormat.isCacheEnabled()) {
            if (dataIn.readBoolean()) {
                short index = dataIn.readShort();
                DataStructure object = wireFormat.looseUnmarshalNestedObject(dataIn);
                wireFormat.setInUnmarshallCache(index, object);
                return object;
            } else {
                short index = dataIn.readShort();
                return wireFormat.getFromUnmarshallCache(index);
            }
        } else {
            return wireFormat.looseUnmarshalNestedObject(dataIn);
        }
    }

    protected void looseMarshalCachedObject(OpenWireFormat wireFormat, DataStructure o, DataOutput dataOut)
        throws IOException {
        if (wireFormat.isCacheEnabled()) {
            Short index = wireFormat.getMarshallCacheIndex(o);
            dataOut.writeBoolean(index == null);
            if (index == null) {
                index = wireFormat.addToMarshallCache(o);
                dataOut.writeShort(index.shortValue());
                wireFormat.looseMarshalNestedObject(o, dataOut);
            } else {
                dataOut.writeShort(index.shortValue());
            }
        } else {
            wireFormat.looseMarshalNestedObject(o, dataOut);
        }
    }

    protected Throwable looseUnmarsalThrowable(OpenWireFormat wireFormat, DataInput dataIn)
        throws IOException {
        if (dataIn.readBoolean()) {
            String clazz = looseUnmarshalString(dataIn);
            String message = looseUnmarshalString(dataIn);
            Throwable o = createThrowable(clazz, message);
            if (wireFormat.isStackTraceEnabled()) {
                if (STACK_TRACE_ELEMENT_CONSTRUCTOR != null) {
                    StackTraceElement ss[] = new StackTraceElement[dataIn.readShort()];
                    for (int i = 0; i < ss.length; i++) {
                        try {
                            ss[i] = (StackTraceElement)STACK_TRACE_ELEMENT_CONSTRUCTOR
                                .newInstance(new Object[] {looseUnmarshalString(dataIn),
                                                           looseUnmarshalString(dataIn),
                                                           looseUnmarshalString(dataIn),
                                                           Integer.valueOf(dataIn.readInt())});
                        } catch (IOException e) {
                            throw e;
                        } catch (Throwable e) {
                        }
                    }
                    o.setStackTrace(ss);
                } else {
                    short size = dataIn.readShort();
                    for (int i = 0; i < size; i++) {
                        looseUnmarshalString(dataIn);
                        looseUnmarshalString(dataIn);
                        looseUnmarshalString(dataIn);
                        dataIn.readInt();
                    }
                }
                o.initCause(looseUnmarsalThrowable(wireFormat, dataIn));

            }
            return o;
        } else {
            return null;
        }
    }

    protected void looseMarshalThrowable(OpenWireFormat wireFormat, Throwable o, DataOutput dataOut)
        throws IOException {
        dataOut.writeBoolean(o != null);
        if (o != null) {
            looseMarshalString(o.getClass().getName(), dataOut);
            looseMarshalString(o.getMessage(), dataOut);
            if (wireFormat.isStackTraceEnabled()) {
                StackTraceElement[] stackTrace = o.getStackTrace();
                dataOut.writeShort(stackTrace.length);
                for (int i = 0; i < stackTrace.length; i++) {
                    StackTraceElement element = stackTrace[i];
                    looseMarshalString(element.getClassName(), dataOut);
                    looseMarshalString(element.getMethodName(), dataOut);
                    looseMarshalString(element.getFileName(), dataOut);
                    dataOut.writeInt(element.getLineNumber());
                }
                looseMarshalThrowable(wireFormat, o.getCause(), dataOut);
            }
        }
    }

    protected String looseUnmarshalString(DataInput dataIn) throws IOException {
        if (dataIn.readBoolean()) {
            return dataIn.readUTF();
        } else {
            return null;
        }
    }

    protected void looseMarshalString(String value, DataOutput dataOut) throws IOException {
        dataOut.writeBoolean(value != null);
        if (value != null) {
            dataOut.writeUTF(value);
        }
    }

    protected void looseMarshalObjectArray(OpenWireFormat wireFormat, DataStructure[] objects,
                                           DataOutput dataOut) throws IOException {
        dataOut.writeBoolean(objects != null);
        if (objects != null) {
            dataOut.writeShort(objects.length);
            for (int i = 0; i < objects.length; i++) {
                looseMarshalNestedObject(wireFormat, objects[i], dataOut);
            }
        }
    }

    protected void looseMarshalConstByteArray(OpenWireFormat wireFormat, byte[] data, DataOutput dataOut,
                                              int i) throws IOException {
        dataOut.write(data, 0, i);
    }

    protected byte[] looseUnmarshalConstByteArray(DataInput dataIn, int i) throws IOException {
        byte data[] = new byte[i];
        dataIn.readFully(data);
        return data;
    }

    protected void looseMarshalByteArray(OpenWireFormat wireFormat, byte[] data, DataOutput dataOut)
        throws IOException {
        dataOut.writeBoolean(data != null);
        if (data != null) {
            dataOut.writeInt(data.length);
            dataOut.write(data);
        }
    }

    protected byte[] looseUnmarshalByteArray(DataInput dataIn) throws IOException {
        byte rc[] = null;
        if (dataIn.readBoolean()) {
            int size = dataIn.readInt();
            rc = new byte[size];
            dataIn.readFully(rc);
        }
        return rc;
    }

    protected void looseMarshalByteSequence(OpenWireFormat wireFormat, ByteSequence data, DataOutput dataOut)
        throws IOException {
        dataOut.writeBoolean(data != null);
        if (data != null) {
            dataOut.writeInt(data.getLength());
            dataOut.write(data.getData(), data.getOffset(), data.getLength());
        }
    }

    protected ByteSequence looseUnmarshalByteSequence(DataInput dataIn) throws IOException {
        ByteSequence rc = null;
        if (dataIn.readBoolean()) {
            int size = dataIn.readInt();
            byte[] t = new byte[size];
            dataIn.readFully(t);
            rc = new ByteSequence(t, 0, size);
        }
        return rc;
    }
}

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