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geweest

Framing rules make it impractical to implement http/2 correctly on a single blocking thread. The flow-control features introduce feedback between reads and writes, requiring writes to acknowledge reads and reads to throttle writes.

In OkHttp we expose a blocking API over a framed protocol. This document explains the code and policy that makes that work.

### Threads

#### Application's calling thread

                <arg>-sourcepath</arg>
                <arg>${project.basedir}/src</arg>
                <arg>--add-reads=com.google.common=ALL-UNNAMED</arg>
                <arg>--add-reads=com.google.common.testlib=ALL-UNNAMED</arg>
                <!-- https://errorprone.info/docs/installation#maven -->
                <arg>-XDcompilePolicy=simple</arg>
                <arg>-Xlint:-removal</arg>
                <arg>-Xlint:-options</arg>

                <arg>-sourcepath</arg>
                <arg>${project.basedir}/src</arg>
                <arg>--add-reads=com.google.common=ALL-UNNAMED</arg>
                <arg>--add-reads=com.google.common.testlib=ALL-UNNAMED</arg>
                <!-- https://errorprone.info/docs/installation#maven -->
                <arg>-XDcompilePolicy=simple</arg>
                <arg>-Xlint:-removal</arg>
                <arg>-Xlint:-options</arg>

	readTriggerCh := make(chan bool, len(p.readers))
	defer xioutil.SafeClose(readTriggerCh) // close the channel upon return

	for i := 0; i < p.dataBlocks; i++ {
		// Setup read triggers for p.dataBlocks number of reads so that it reads in parallel.
		readTriggerCh <- true
	}

	disksNotFound := int32(0)
	bitrotHeal := int32(0)       // Atomic bool flag.
	missingPartsHeal := int32(0) // Atomic bool flag.
	readerIndex := 0

              </compileSourceRoots>

              <!-- JPMS needs access to the module sources to complete a modular Java build. -->
              <compilerArgs>
                <arg>-sourcepath</arg>
                <arg>${project.basedir}/src</arg>
                <arg>--add-reads=com.google.common=ALL-UNNAMED</arg>
                <!-- https://errorprone.info/docs/installation#maven -->

              </compileSourceRoots>
              <includes>
                <include>module-info.java</include>
              </includes>

              <!--
                JPMS needs access to the module sources to complete a modular Java build. We also need to override the
                base compile settings (in the root `pom.xml`) to enable MRJAR output.
              -->

     * For example, an artifact of type {@value org.apache.maven.api.Type#JAR} can be placed
     * either on the class-path or on the module-path. The project needs to make a choice
     * (possibly using heuristic rules), then add the dependency in only one of the paths
     * identified by {@link PathType}.
     *
     * @return file paths to place on the different tool options
     */

// indicates readDirFn to return without further applying the fn()
var errDoneForNow = errors.New("done for now")

// errSkipFile returned by the fn() for readDirFn() when it needs
// to proceed to next entry.
var errSkipFile = errors.New("skip this file")

var errIgnoreFileContrib = errors.New("ignore this file's contribution toward data-usage")

        return this.dis.available();
    }

    /**
     * Reads bytes into the specified array.
     * @param b the byte array to read into
     * @throws IOException if an I/O error occurs
     */
    public void readFully(final byte[] b) throws IOException {
        this.dis.readFully(b);
    }

    /**
     * Reads bytes into the specified array at the given offset.
     * @param b the byte array to read into